Weak links

General discussion about the sport of hang gliding
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Tad Eareckson
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Re: Weak links

Post by Tad Eareckson »

http://ozreport.com/forum/viewtopic.php?t=31052
Poll on weaklinks
Bill Cummings - 2013/03/08 05:41:58 UTC
Deltaman - 2013/03/04 12:23:50 UTC

http://vimeo.com/17743952

password - red
10-525
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I looked at the Vimeo several times.
It's a "video", Bill.
The nose pops just before leaving the ground.
Yeah. He's towing one point and foot launching in an environment in which he doesn't need to and he has his hands halfway up the downtubes.

And:

- I don't give a rat's ass who you are - you CANNOT control a glider anywhere near as effectively and safely upright with your hands on the downtubes as you can prone with your hands on the basetube.

- launches and landings are extraordinarily bad times to have glider control compromised.

- tow launches are even worse.

- one point tow launches are still worse.
Due to too high of an angle of attack as a result of the nose pop the right tip starts to stall.
So how come the left tip doesn't also start to stall?
The reason for a climb restricting "V" bridle is so that you can keep this from happening.
The reason for using a two point bridle is to keep you in proper position with respect to the glider / control bar when there's a lot of forward component to the tow tension.
It would adjust for the angle as you were ascending.
The higher the tow angle the more irrelevant/useless a keel attachment becomes.
I have never static launched like this without a bridle going to the keel.
So given that an aerotow from start to finish is pretty much identical to a the launch and early stage of a surface static tow would you say that aerotowing one point as an inherently bad idea?
To do so would put me at the mercy of the tow driver.
How 'bout a monster thermal at 150 feet?
This tow driver however was not at fault and was not pulling too fast.
How 'bout Zack Marzec's tow driver? Can we eliminate him from the list of possible issues?
The driver would not have popped a 100 lb weaklink with that easy tow up.
There's no bridle involved in this tow so a one hundred pound weak link means one hundred pound towline. So if we make that glider 250 pounds you're saying that a 0.4 G weak link - 38 percent of what a Rooney Link can do for a pro toad - would've held just fine. Good freakin' luck.
Having a stronger weaklink had no play in saving this launch.
What the fuck kind of statement is that?

- The weak link held. So whether it held with a five pound margin or a five hundred pound margin it was irrelevant.

- If it had blown at THIS:

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point he'd have been fucked - period.
Pilot error: 1. Wrong selection of a bridle for static towing.
There was no bridle.
2. Popping the nose before launch.
Tell me how popping the nose BEFORE launch has any bearing on what happens DURING launch.
If you don't think so, go look at it again with my take in mind as you watch again and you will see that I'm most likely correct.
If there is a bridle going to the keel I can't see it on this computer.
At five seconds, the point of the extracted still shot, it's very clear that he's flying a two stage - meaning one point / pilot only.

So do you wanna contribute anything really useful to the discussion on Zack Marzec and at least go on record as saying that there's no question that a big part of what got him killed was being enough of a fucking idiot pro to think that there was no situation he wouldn't be able to handle as well or better minus a two point bridle than a new Hang Two with one? Or are you afraid that would that reduce you to the level of a vile speculator and earn you the undying Wrath of Rooney?
Deltaman - 2013/03/08 14:40:35 UTC

This pilot did a very poor job during that take off, but that wasn't my point. All that matters for the purpose of this discussion is the position and attitude of the glider at the moment shown in the pic, regardless of how he got there.
Well, yeah, but then we'd be making a case that a Davis/Rooney Link pop at that moment probably wouldn't do much to increase the safety of the towing operation and we just can't permit any discussion along those lines.
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Re: Weak links

Post by Tad Eareckson »

http://ozreport.com/forum/viewtopic.php?t=31052
Poll on weaklinks
Davis Straub - 2013/03/08 12:31:52 UTC

130 lbs Greenspot would be fine.
OF COURSE IT WOULD! Bobby, Quest, Malcolm, Lockout, Ridgely, Manquin, Trisa, Brad, Rooney, and you have been right all along!
Yup, we had no problem at the Worlds in tough conditions.
Yup.

We've established that:

- Six failures per six launches in mild morning conditions constitutes...
Davis Straub - 2013/03/08 03:16:54 UTC

Just cause we were breaking them apparently a little too easily at Zapata...
...breaking a little too easily and four failures per six launches is just about right.

- Any suggestion that the Davis Link that blew up in Zack Marzec's face just before he tailslid, whipstalled, tumbled, and died was a possible contributing factor...
Davis Straub - 2013/02/09 05:38:41 UTC

A standard 130 pound test weak link was being used.
The weak link broke.

So what?
Davis Straub - 2013/02/09 16:45:39 UTC

I can't see how the weaklink has anything to do with this accident.
Davis Straub - 2013/02/09 17:45:21 UTC

I have no idea of the circumstances he faced.
Davis Straub - 2013/02/13 15:45:22 UTC

We have no agreement that a stronger weaklink would make it safer...
Davis Straub - 2013/03/05 13:43:19 UTC

There was no conclusion.
Davis Straub - 2013/03/06 18:29:05 UTC

I'm happy to have a relatively weak weaklink, and have never had a serious problem with the Greenspot 130, just an inconvenience now and then.
Davis Straub - 2013/03/06 22:21:00 UTC

I'm with you, Brad.
Davis Straub - 2013/03/08 02:37:02 UTC

I'm certainly with Jim on this. I appreciate the weaklink breaking under much less force.
...is just a load of completely unfounded speculative bullshit put forth by a bunch of asswipes exploiting this unpreventable and tragic freak accident to push their pet theories and twisted personal agendas.

So now that we've cleared this hurdle and we've established a precedent that the only way a Davis Link can be a factor in a hang gliding incident is if it's captured by a minimum of two onboard cameras untying itself from the bridle after release, elongating, and strangling the pilot to death you can keep using that fishing line to crash, cripple, and kill people at any rate you feel like for just as long as you feel like and keep on claiming that it's increasing the safety of the towing operation.
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Tad Eareckson
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Re: Weak links

Post by Tad Eareckson »

http://ozreport.com/forum/viewtopic.php?t=31052
Poll on weaklinks
Brad Gryder - 2013/03/08 15:56:41 UTC

AIDS - Aeronautical Inferiority Denial Syndrome

In a minority of hang glider pilots, we see that weak pilot skills (if not treated) sometimes leads to chronic death-a-phobia. This condition may lead to over-dependence on super-string theory, which temporarily pacifies the egotistical patient and allows him to cope within his imaginary cocoon of immortality.
Barring abstinence, the best prevention against AIDS is the use of a weak link, coupled with hours upon hours of quality airtime.
Yeah Brad, I'd have deleted this idiot nonsensical post shortly after it went up too. But I'd have deleted it before someone like me would've had a chance to archive it for comment...

- Of the people who fly hang gliders only a microscopic minority of them are or have the chance of becoming PILOTS - and assholes like you can safely count yourselves out.

- You can have pilot skills oozing out your ass and still be able to perform no better than a sandbag if Rooney Link pops at the right time.

- Anybody too fucking stupid to have acute death-a-phobia from the moment the tow ring is clipped onto his bridle until he clears two hundred feet deserves whatever happens to him.

- Pin bending, Rooney Linking, pro toads deserve whatever happens to them regardless of their frames of mind.

- THIS:

http://ozreport.com/forum/viewtopic.php?t=24846
Is this a joke ?
Jim Rooney - 2011/08/28 19:39:17 UTC

Weak links break for all kinds of reasons.
Some obvious, some not.

The general consensus is the age old adage... "err on the side of caution".

The frustration of a weaklink break is just that, frustration.
And it can be very frustrating for sure. Especially on a good day, which they tend to be. It seems to be a Murphy favourite. You'll be in a long tug line on a stellar day just itching to fly. The stars are all lining up when *bam*, out of nowhere your trip to happy XC land goes up in a flash. Now you've got to hike it all the way back to the back of the line and wait as the "perfect" window drifts on by.

I get it.
It can be a pisser.
is what Rooney Linkers - and the poor bastards who get stuck and held back in line behind them and their subsidized relights - get in lieu of hours upon hours of quality airtime.

Asshole.
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Re: Weak links

Post by Tad Eareckson »

http://ozreport.com/forum/viewtopic.php?t=31052
Poll on weaklinks
Freedomspyder - 2013/03/09 15:23:42 UTC

Weaklink break at the Worlds.

The break occurs at 1:36. He didn't seem to be that far out of line to me. What do you think?

http://www.youtube.com/watch?v=qAnmB8pjGA0
No keel attachment, ability to blow tow with both hands on the basetube, or wheels. Obviously a pro.

Carabiner turned around backwards with gate and locking barrel aft so that if he changes his mind and uses it as a two point release anchor it won't be torn apart from the inside. Probably won't need to use his parachute so probably won't have any issues with his bridle at the attachment point.

006-01404
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Damn good thing that's a 582 Dragonfly. If that had been a 914 the Rooney Link would've needed to have blown to keep his wings from being torn off by the shock of slamming into the propwash.

016-03622
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Glider tracking off course and slightly rolled to the right as tug starts climbing in thermal.

036-13100
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Fails to hold correction.

038-13221
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Rooney Link blows under very light tension with glider mildly/slowly locking out to the right in thirty degree roll at eight hundred feet as tug flies out of the other side of the thermal.

045-13607
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Glider continues flying with no stall and but a few feet of altitude loss in 30 degree bank.

047-13623
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Glider starts fucking around moving his hands from control position to stunt landing position.

084-23101
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In the initial effort he moves his right hand uselessly around the front of the downtube...

084-23101
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...releases, makes another grab, bounces off the tail wire, and comes back for a successful grab on the third effort.

086-23113
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Nails the left downtube on the first try...

092-23405
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...and is now safely transitioned to whipstall / arm break configuration.

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Slows WAY down. So much for a good whipstalled stunt landing.

101-23806
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Plows in with mild left ground loop...

110-24410
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...folds 125 dollar downtube in half, knocks self out of day's competition - but gains experience he'll need for landing in narrow dry riverbed with large rocks strewn all over the place - if he's lucky enough to be able to find one somewhere out in that desert.

115-24508
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Risks death from Aussie Methodism Enforcement Squad by unhooking harness from glider wreckage before extracting himself.

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---
2022/06/03 14:00:00 UTC

I've done a rather massive stills project on this one and have edited this post with a few of the frames. Main attraction to appear in this topic soon.
---
http://www.kitestrings.org/post12306.html#p12306
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Tad Eareckson
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Re: Weak links

Post by Tad Eareckson »

http://ozreport.com/forum/viewtopic.php?t=31052
Poll on weaklinks
Brad Gryder - 2013/03/09 17:28:24 UTC

By my standards, he's pretty far out to the right and diverging, so the weak link performs its intended design function perfectly in this case.
Zack C - 2013/02/15 01:53:11 UTC

My only point in posting the video was to demonstrate that weak links cannot prevent attitudes that could be catastrophic near the ground.
Davis Straub - 2013/02/15 02:04:29 UTC

I can't imagine anyone arguing that they would.
Brad Gryder - 2013/03/09 17:28:24 UTC

This pilot is "twisting in the harness" instead of getting his hips up to the left where his cg needs to be.
So who signed him off for aerotow?
The weak link pops without anything spooky happening on either end of the line - and that's a GOOD thing.
- ESPECIALLY when you're using BOTH hands to fight a lockout, some asshole sold you a release with an actuator way the fuck somewhere else, and you were stupid enough to buy and fly it.

- How spooky do you think the tug was gonna let things get for him before he squeezed the lever that Bobby gave him so he could keep the FRONT END safe?

- What's the worst that could happen if that system had been protected by a two G weak link and nobody did anything?
Jim Rooney - 2013/03/09 19:46:17 UTC

Here's a pretty decent example of why I say that I don't trust you guys to hit the release, especially when it matters...
- Tell me:
-- how ANYTHING *MATTERS* at eight hundred feet - asshole
- a good reason for not fighting a lockout at eight hundred feet until the glider either comes back or blows the fishing line

- So if this matters tell me how the guy on the glider was any more of a useless doofus than the asshole on the tug.

- If all of us guys are such a bunch of clueless muppets...

-- Why are you towing us? How come you have have a general release rule of not towing any funky shit but you're totally cool with towing funky pilots? Lemme guess... You can make more money by selling us your fine bent pin Industry Standard crap AND towing funky pilots while you pretend you're being safe and responsible by forcing everybody up on chintzy fishing line to increase the safety of the towing system enough so that nothing else matters?

-- Whose fault is it that all of us guys are such a bunch of clueless muppets? Obviously all of the students of such Eminently Qualified Tandem Pilots as Sunny, Steve Wendt, Lauren, Bo, Malcolm, Trisa, Bart, Mark Knight, and you can do all this shit flawlessly blindfolded with one hand tied behind their backs - so where are the muppets coming from and why aren't you naming names and calling to have them shut down?

- How come this asshole:

http://www.chgpa.org/forums/viewtopic.php?f=2&t=3391
More on Zapata and weak link
Paul Tjaden - 2008/07/22 04:32:22 UTC

I have never had a lockout situation happen so quickly and dramatically and had no chance to release as I have always thought I could do.
doesn't hit the release when it matters. Any chance Industry Standard releases with long track records CAN'T be released when it matters?

- How 'bout THIS:

Image
http://ozreport.com/pub/images/fingerlakesaccident2.jpg
http://ozreport.com/pub/images/fingerlakesaccident3.jpg
Image

asshole?

- Check the video:

http://www.youtube.com/watch?v=qAnmB8pjGA0


at 1:36 when the Rooney Link blows.

075-13606
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If he starts locking out to the right just off the cart, fulfills your expectation of not hitting the release when it ACTUALLY DOES MATTER, and waits for the Rooney Link to increase the safety of the towing operation he's gonna be just fine after the subsequent cartwheel, right?
Freedomspyder - 2013/03/09 15:23:42 UTC

He didn't seem to be that far out of line to me.
His bridal was touching is nose wires.
BULLSHIT.

He's towing one point, he's being pulled THROUGH the control frame so from the side he looks like THIS:

Image

...his bridle can't POSSIBLY be touching the nose wires - or even one of them.

(Another really well written sentence by the way. Seven words, two syllables max, two of them fucked up.)
He's severely out of whack.
BULLSHIT.

THIS:

http://www.youtube.com/watch?v=27yFcEMpfMk


is seriously out of whack. Now tell me...
- what a muppet Jamie Shelden is
- how much better off she was using her release than Sander was waiting for his Rooney Link to increase the safety of the towing operation
- how alive she'd be if she'd locked out at twenty feet and waited for her Rooney Link to blow
Yet this is seen by many (not just you) as "not too far off".
It isn't. THIS:
Bill Bryden - 2000/02

Dennis Pagen informed me several years ago about an aerotow lockout that he experienced. One moment he was correcting a bit of alignment with the tug and the next moment he was nearly upside down. He was stunned at the rapidity. I have heard similar stories from two other aerotow pilots.
...is too far off.

Now tell me how Dennis and these two other aerotow pilots are muppets and how much good their Rooney Links would've done them at twenty feet.

Stupid fuckin' twat.

P.S. Speaking of people trusting assholes to do their fuckin' jobs...
The Press - 2006/03/15

The Civil Aviation Authority (CAA) is urgently pushing for new hang-gliding industry standards after learning a hang-gliding pilot who suffered serious injuries in a crash three weeks ago had not clipped himself on to the glider.

Extreme Air tandem gliding pilot James (Jim) Rooney safely clipped his passenger into the glider before departing from the Coronet Peak launch site, near Queenstown, CAA sports and recreation manager Rex Kenny said yesterday.

However, he took off without attaching himself.

In a video, he was seen to hold on to the glider for about fifty meters before hitting power lines.

Rooney and the passenger fell about fifteen meters to the ground.
- How much did:

- Extreme Air have to fork over to settle with your passenger - Mister James (Jim) Keen-Intellect Pilot-In-Command Rooney?

- the New Zealand taxpayers have to flush down the toilet to keep your rotten ass alive and put you back together so you could keep fucking up the sport?
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Re: Weak links

Post by Tad Eareckson »

http://ozreport.com/forum/viewtopic.php?t=31052
Poll on weaklinks
Freedomspyder - 2013/03/09 20:48:43 UTC

Thanks. Looking at the bridle has helped my the perspective.
At no time in that sequence can you even SEE any part of the bridle.

What you CAN see are his shoulders - and when a shoulder touches a downtube the bridle/release assembly attachment on that side is still about five inches inboard of the downtube and nose wire near the point of its lower attachment.
How close to a lockout do you think this is? Or is it one?
I'd say no. It's a lockout when misaligned tow tension overwhelms every effort the pilot can make to bring the glider back into sustainable tow position. And this guy didn't begin to make every effort he could to bring the glider back into sustainable tow position.
Bill Cummings - 2013/03/09 22:41:58 UTC

1:31 Tug enters thermal
1:33-1:34 Lock out starting.
1:34 Glider enters thermal as tug departs thermal. (tension builder)
1:36 Weaklink pops about two to three seconds into the lockout.

Brad Gryder, Jim Rooney and I too see the weaklink going when it should.
- Brad Gryder, Jim Rooney, and you are assholes. Nobody with half a brain or better gives a flying fuck what you assholes "see".

- If Rooney Links could be relied upon to break when they "should" Mike Haas, Steve Elliot, Roy Messing, Lois Preston, and Zack Marzec would still be alive.

- Wanna explain to me...

http://www.chgpa.org/forums/viewtopic.php?f=2&t=3648
Oh no! more on weak links
Carlos Weill - 2008/11/30 19:24:09 UTC

On June of 2008 during a fast tow, I noticed I was getting out of alignment, but I was able to come back to it. The second time it happen I saw the tug line 45 deg off to the left and was not able to align the glider again I tried to release but my body was off centered and could not reach the release. I kept trying and was close to 90 deg. All these happen very quickly, as anyone that has experienced a lock out would tell you. I heard a snap, and then just like the sound of a WWII plane just shut down hurdling to the ground, only the ball of fire was missing. The tug weak link broke off at 1000ft, in less than a second the glider was at 500ft. At that point I realized I had the rope, so I drop it in the parking lot.
-- why Carlos's Rooney Link didn't go when Brad Gryder, Jim Rooney, and you THINK it should have?

-- your calculations for figuring out how much of Carlos would be still be sticking out of his helmet if the second time it happened he'd been at four hundred feet?

- The ONLY thing anybody who isn't on an acid trip can consistently "see" a Rooney Link doing is limiting bridle tension to a maximum of 130 pounds.
To me the pilots reaction time would come later than the weaklink reaction time on this video.
Fuck you.

- The goddam pilot is making no effort whatsoever to release and has NOTHING to gain by doing so.

- ANYBODY who could afford to take a hand off the basetube in a situation link that could've...
Weaklink pops about two to three seconds into the lockout.
...EASILY beaten that weak link.

- If you're so fucking concerned about towing safety then why aren't you doing jack shit to get that useless bent pin crap out of the air and help us get some decent release technology...

http://www.youtube.com/watch?v=rh3-uZptNw0


...into circulation?
Weaklinks are good for more than just protecting the glider.
Yeah. They're good for...

http://www.youtube.com/watch?v=1kGn7ITFfHc

08-2904
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- getting people exercise through forced walks with their gliders and harnesses back to the downwind ends of runways

http://www.youtube.com/watch?v=MlIGsgNFRWM
]

- wasting everybody's time and money on good flying days

http://www.youtube.com/watch?v=IjncKQ02FJ8


- crashing scooter tow students

http://www.youtube.com/watch?v=eTKIAvqd7GI


- breaking downtubes

0:50
http://www.youtube.com/watch?v=JR_4jKLqrus


- scaring the crap out of people

http://www.youtube.com/watch?v=WFAPpz6I6WU


- causing whipstalls

http://www.youtube.com/watch?v=2WtDFymXlPU


- crashing tandem truck tow rides

http://www.youtube.com/watch?v=VYe3YmdIQTM


- breaking arms and ending hang gliding careers

http://4.bp.blogspot.com/-bRrpHNa68iY/UQ6Pv9gRZyI/AAAAAAAAjTg/Hc22bx5122Q/s2048/20943781_BG1.jpg
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- causing tandem instructors to have inexplicable fatal freak accidents about which no one's permitted to speculate

- giving the dumb shits stupid enough to listen assholes like Brad Gryder, Jim Rooney, and you the confidence they need to go up with Industry Standard tow equipment
Freedomspyder - 2013/03/09 23:11:13 UTC

I see he got pretty out of whack earlier at 1:23.
He couldn't POSSIBLY have.
Lauren Tjaden - 2011/08/01 02:01:06 UTC

For whomever asked about the function of a weak link, it is to release the glider and plane from each other when the tow forces become greater than desirable -- whether that is due to a lockout or a malfunction of equipment or whatever. This can save a glider, a tow pilot, or more often, a hang glider pilot who does not get off of tow when he or she gets too far out of whack.
He has a Lauren Link which prevents him from getting too far out of whack.
But then he was earlier to get his weight over.
Because that time he actually TRIED.
So this a lockout? I wonder if he even realizes he had a lockout...
He doesn't care. At eight hundred feet it doesn't matter.

Now let's start talking about Roy Messing and how in dead morning air a Rooney Link isn't any better a than an idiot fucking hook knife in compensating for some piece of shit Matt's marketing as an aerotow release.

P.S. One thing you have to say on behalf of a hook knife...

It only works to increase the safety of the operation at some reasonably long interval after the pilot's decision to actuate it. And the only neck I know of one getting broken was Brian Vant-Hull's - after he used it to separate himself from the glider he stuck in the trees at High Rock.
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Re: Weak links

Post by Tad Eareckson »

http://ozreport.com/forum/viewtopic.php?t=31052
Poll on weaklinks
Deltaman - 2013/03/10 00:03:10 UTC
Bill Cummings - 2013/03/09 22:41:58 UTC

Brad Gryder, Jim Rooney and I too see the weaklink going when it should.
To me the pilots reaction time would come later than the weaklink reaction time on this video.
Weaklinks are good for more than just protecting the glider.
That is not a demonstration but an "inductive reasoning", a kind of reasoning that constructs general propositions that are derived from specific examples.. Bias.
Yes. Those assholes saw that weak link "going when it should" to defuse a nonexistent situation and discarded the facts that:

- at that altitude a two G weak link would've gone when it should within the next second with similar inconsequential results

- if it had gone when it should just off the dolly the glider would've cartwheeled

- when a Rooney Link ACTUALLY *SHOULD* go is when the bridle tension hits 130 pounds and if you're a pro toad getting blasted up by a monster thermal 150 feet off the runway that tension WILL BE reached when you're standing on your tail and you WILL whipstall
Being always confident in the weaklink to break at the right moment and the right configuration as should be the purpose of a release would cause catastrophic issue NEAR THE GROUND.
Bring 'em on. Plenty more life left in this keyboard.
About the vid:
the pilot don't work well. He should have corrected more and more with the hips rather than the shoulder like that :
Image
(Better when tension is not applyed at the inner corner.)

Don't know what happen in his mind: don't care about the lockout as he is at a safety altitude ?.. can't recognize it (bad instruction) ?.. not confortable to actuate a release that requires to let a hand go and loose control in an incipient lockout (bad equipment) ?..

Personally if I weren't able to correct the incipient lockout I would have release 1sec before the weaklink blow on the vid.
Jim Rooney - 2013/03/10 05:35:17 UTC
Freedomspyder - 2013/03/09 20:48:43 UTC

How close to a lockout do you think this is? Or is it one?
A "lockout"... when you have full control input but are still moving away from being in position.
Bullshit.

A lockout is when you've reached the point at which misaligned tow tension overwhelms the pilot's control authority and the glider ain't coming back.
An incipient lockout would be having full control input but you're not moving towards being back in position but also not moving further out of position.
An incipient lockout is when the pilot still has the control authority to bring the glider back if he does something about it NOW.
So, yes, he locked out.
No he didn't. He never exercised full control authority. He allowed the glider to turn away from the tug until his Rooney Link popped.
Deltaman... ah, a strawman argument at it's finest... who's "relying" on the weaklink?
You are - motherfucker.

You're towing muppets on Industry Standard equipment with long track records - the vast majority of which totally suck - and forcing everybody up on Rooney Links because they increase the safety of the towing operation - PERIOD. You're rolling dice with peoples lives and counting on them coming up boxcars WHEN the shit hits the fan - and ignoring the crashes which result in routine operations when the come up just about anything else and the deaths which result when other shit hits the fan and they come up snake eyes.

And I notice you're not contradicting...
Bill Cummings - 2013/03/09 22:41:58 UTC

Brad Gryder, Jim Rooney and I too see the weaklink going when it should.
...Bill Idiot Cummings.
I'm always baffled by the tunnel vision of that argument...
Hell, you're totally baffled by shit as fucking obvious as Zack Marzec's Rooney Link induced whipstall. So why don't you save us all a lot of time and just list the two three things that you aren't baffled by?
...sure, don't rely on it... BUT... It can still help you even if you're not relying on it.
And there are ABSOLUTELY NO significant downsides to Rooney Links.

Try googling:

"everything in aviation is a tradeoff"

See anything in there about 130 pound Greenspot? OF COURSE NOT!!! Good fer whatever ails ya. And if you get smeared all over the runway as a result of it increasing the safety of the towing operation it's only because you were a crappy pilot.
Please dispense with this nonsensical argument.
Go fuck yourself.
Before you can put forth your inevitable BS other argument... a weaklink that allows you to get to a critical position close to the ground hasn't broken SOON ENOUGH.
Still waiting for that recommendation of some fishing line some of us muppets can use to compensate for our crappy pilot skills.
It's breaking didn't cause the problem.. you did... by hanging on till things got really bad.
http://4.bp.blogspot.com/-bRrpHNa68iY/UQ6Pv9gRZyI/AAAAAAAAjTg/Hc22bx5122Q/s2048/20943781_BG1.jpg
Image

:lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol:
Cardinal rule for AT students... "Expect the weaklink to break at any moment what so ever.
- "Whatsoever" is one word - douchebag.

- Hey, maybe we should have a cardinal rule for foot launching along the lines of "Expect the carabiner to be dangling behind your knees at every moment right up to the last two seconds before your foot moves and make sure your wrong at that point." Whatchya think? Oh, right. If that were a good idea everybody would be doing it already. Never mind.
You should *never* allow yourself into a position where you are reliant upon the weaklink... if you are, then you failed to hit the release."
But you should *always* allow yourself into a position where you are reliant upon the hang check you did two minutes ago for reassurance that...
In a video, he was seen to hold on to the glider for about fifty meters before hitting power lines.

Rooney and the passenger fell about fifteen meters to the ground.
...you're connected to your glider.
There is no time where a weaklink break should put you in harms way.
Except during tandem training...
The candidate must also demonstrate the ability to properly react to a weak link/tow rope break simulation with a tandem rated pilot, initiated by the tandem pilot at altitude, but at a lower than normal release altitude. Such demonstrations should be made in smooth air.
Then you really wanna be way the fuck up there in smooth air.
If it does, you have failed, not it.
Ya fuckin' muppet.
You failed to hit your release.
Yeah Shane...

http://groups.yahoo.com/group/hhpa/message/11155
Question
Shane Nestle - 2010/09/17 22:17:50 UTC

So far I've only had negative experiences with weak links. One broke while aerotowing just as I was coming off the cart. Flared immediately and put my feet down only to find the cart still directly below me. My leg went through the two front parallel bars forcing me to let the glider drop onto the control frame in order to prevent my leg from being snapped.
Hit your release before you get into trouble next time.
You were hoping to "save the tow". Let go. Try again.
Yeah Dennis...
Dennis Pagen - 2005/01

Soon after lift-off the trike tug and I were hit by the mother of all thermals. Since I was much lighter, I rocketed up well above the tug, while the very experienced tug pilot, Neal Harris, said he was also lifted more than he had ever been in his heavy trike. I pulled in all the way, but could see that I wasn't going to come down unless something changed.

I hung on and resisted the tendency to roll to the side with as strong a roll input as I could, given that the bar was at my knees. I didn't want to release, because I was so close to the ground and I knew that the glider would be in a compromised attitude. In addition, there were hangars and trees on the left, which is the way the glider was tending.

By the time we gained about sixty feet I could no longer hold the glider centered - I was probably at a twenty degree bank - so I quickly released before the lockout to the side progressed.

The glider instantly whipped to the side in a wingover maneuver. I cleared the buildings, but came very close to the ground at the bottom of the wingover. I leveled out and landed.

Analyzing my incident made me realize that had I released earlier I probably would have hit the ground at high speed at a steep angle. The result may have been similar to that of the pilot in Germany. The normal procedure for a tow pilot, when the hang glider gets too high, is to release in order to avoid the forces from the glider pulling the tug nose-down into a dangerous dive. However Neal kept me on line until I had enough ground clearance, and I believe he saved me from injury by doing so. I gave him a heart-felt thank you.
Don't try to "save the tow". Let go. Try again. Especially when you've got a crappy tug pilot a little slow to make a good decision in the interest of your safety.
A stronglink on the other hand would very much allow you to get yourself into far more dangerous situations.
Except, of course, for the new two hundred pounder they've been using at Morningside for the past year. That's now an accepted standard so it performs with exactly the same safety margins as the original accepted standard.
So as much as you want to jump up and down and rave about how it's "Your choice!!!!"... too bad. It's not. You're on my rope.
I have a REALLY good idea for you and your rope - you unbelievably vile little pigfucker.
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Tad Eareckson
Posts: 9161
Joined: 2010/11/25 03:48:55 UTC

Re: Weak links

Post by Tad Eareckson »

http://ozreport.com/forum/viewtopic.php?t=31052
Poll on weaklinks
Zack C - 2013/03/10 07:17:34 UTC
Bill Cummings - 2013/03/09 22:41:58 UTC

Weaklinks are good for more than just protecting the glider.
But expecting them to do anything more is a recipe for disaster.

Saying that the weak link 'did its job' or 'is designed to do that' with regards to the video is as nonsensical a statement to me as limiting its job to something it can actually do consistently seems to be to others...
...permitted...
...here.
Jim Rooney - 2013/03/10 05:35:17 UTC

A stronglink on the other hand would very much allow you to get yourself into far more dangerous situations.
Can you support this? (And can you define 'stronglink' so that we know what you're talking about?)
Anything over 130 - or, at Morningside, 205.
I've seen no evidence supporting this myself. As a proportion of a glider's MCOW, 130 lb weak links allow anywhere from 0.58 to 1.11 (for Wills's wings, anyway) - the upper end is twice the lower. If you're right (and depending on what a 'stronglink' is), shouldn't we be seeing the lighter gliders/pilots getting into 'far more dangerous situations' than the heavier ones? I don't think that's the case in practice.
Quite the converse, in fact.
You can't draw conclusions from anecdotal evidence, either...anyone can produce anecdotal evidence (as I have) of any weak link strength both allowing scary situations and breaking before things get scary.
deltaman - 2012/05/25 19:45:39 UTC

I miss opportunity to be aerotowed in my mountains but 2 months ago we spent 4 days teaching AT to 12 pilots in 2 points. All had 190kg weaklink (220kg on tug side).
One of them oscillate and start to lockout. I said by radio : (time to) release, he did it (JoeStreet release), but 1ms to late.. the weaklink was just blowed.
and no unexpected wl failure in 90 AT.
I'm confident in this way to think wl..
Jim Rooney - 2013/03/10 05:35:17

So as much as you want to jump up and down and rave about how it's "Your choice!!!!"... too bad. It's not. You're on my rope.
True, but I do find it odd that you're totally OK towing a small Falcon with a weak link 1.11 times MCOW but would refuse to tow a Sport 2 175 with a similarly proportioned weak link.
who's "relying" on the weaklink?
While I don't think anyone said they rely on weak links to prevent lockouts, you at least appear to rely on them to prevent high angles of attack.
Jim Rooney - 2013/03/05 21:40:02 UTC

tow with a WEAKER weaklink... you won't be able to achieve a high AOA.
http://ozreport.com/forum/viewtopic.php?p=118603#118603
Poll on weaklinks
Jim Rooney - 2013/03/10 08:12:02 UTC

Ok, more insanity.
Yeah, now that you're back.
Fun.
Zack C - 2013/03/10 07:17:34 UTC

Can you support this?
WTF are you smoking?
90lb weaklink... you can barely stay on tow (if at all)
You mean like this:

http://www.youtube.com/watch?v=MlIGsgNFRWM


I think you already have us pretty well minned out with respect to that end of the range.
900lb weaklink...
Fuck you.
you can stay on tow into a very high stress and dangerous condition.
Pretty basic math.
Here's some pretty basic math - asshole.
- Quote somebody advocating nine hundred pound weak links.
- Solo Hang gliders are currently flying - and breaking - six hundred pound weak links and doing just fine.
- A six hundred pound weak link puts my glider 0.12 Gs under the FAA legal max.
- Rooney Links have held well enough to lock out midrange gliders, slam them in, and kill them.
- Twice the strength of a Rooney Link doesn't get you twice as dead.
- ANY weak link capable of getting a glider airborne is heavy enough to lock it out and kill it.
- The single most dangerous item you can install in an aerotow system is a Rooney Link.
(And can you define 'stronglink' so that we know what you're talking about?)
Oh get over yourself.
Fuck you.
Stronger than a weaklink.
205 pounds at Morningside, 135 pounds everywhere else.
Troll
Pigfucker.
True, but I do find it odd that you're totally OK towing a small Falcon with a weak link 1.11 times MCOW but would refuse to tow a Sport 2 175 with a similarly proportioned weak link.
Ah yes, the age ole "putting words in people's mouths" strategy.
You mean like this:
Jim Rooney - 2007/07/22 16:59:30 UTC

Basically anything less than the cabling on your glider?
You've got to be kidding me!
Jim Rooney - 2013/02/15 06:48:18 UTC

In your book however, anything less than the cable strength of the glider is OK?

Yeah, sorry... nope. Not behind me at least... go be a test pilot behind someone else.
Jim Rooney - 2013/03/10 08:12:02 UTC

900lb weaklink... you can stay on tow into a very high stress and dangerous condition.
Good. Enjoy that.
You're the one all gooei-eye'd over weaklink strengths.
And your buddy got all gooey-brained because his 130 pound Greenspot Rooney Link improved the safety of the towing operation at the worst possible time, when he was climbing hard in a near stall situation.
If you'd stop and actually listen rather than just collecting things to argue about, you might actually learn what the hell I'll tow and what I won't.
We know EXACTLY what you'll tow and what you won't. We're just hoping that whatever it was that kinked on Keavy's Dragonfly will kink on your Dragonfly and produce identical results.
But alas, that's not going to happen.
No, you won't find that happening much with people with IQs in the mid double digit range and up.
Some people just live to argue.
I live mainly in hopes of reading more posts like this one:

http://ozreport.com/forum/viewtopic.php?t=1238
NZ accident who was the pilot?
Lauren Tjaden - 2006/02/21 20:37:39 UTC

In the meantime, please do not call NZ or Lisa at Quest. This is a difficult time as many of us love Jim very much, and I know you are all anxious for news, as we are.
You can't help it. I know, I know.
I'd say it's ok, but it wouldn't be true.
While I don't think anyone said they rely on weak links to prevent lockouts, you at least appear to rely on them to prevent high angles of attack.
Still not sure what you're smoking.
You're still trying to put words in my mouth though.
Sorry, take your strawman nonsense elsewhere.
Jim Rooney - 2013/03/05 21:40:02 UTC

tow with a WEAKER weaklink... you won't be able to achieve a high AOA.
Just because something does something, doesn't mean you're "relying" on it to do so.
Sheesh.

Sorry Zack
If you were hear to understand something or to have a rational discussion, then we might have something to talk about.
But alas, you're just here to argue.
You've got all your BS theories set in your head and you're just spouting them.

Have fun trying to convince people.
He's convincing all the people worth keeping in the gene pool. You're more than welcome to the all the ones in your lot you can handle.
I'm just bored and I find stirring up your little hornet's nest amusing for some reason.
Three decades ago there was still enough substance to this sport that a rotten little shit like you wouldn't have been tolerated for a nanosecond. Don't be so sure that the pendulum is so stuck in your direction that it can't break back loose for another swing.

Assholes like Paul, Trisa, and Peter have at least enough sense to have kept their mouths shut, locked their forums, and burned their documents. You might do better by following their leads.
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Tad Eareckson
Posts: 9161
Joined: 2010/11/25 03:48:55 UTC

Re: Weak links

Post by Tad Eareckson »

http://ozreport.com/forum/viewtopic.php?t=31052
Poll on weaklinks
Deltaman - 2013/03/10 10:09:52 UTC

Lockout: the shift of your weight can nothing anymore to neutralize it. You reached the irreversible point.
Incipient lockout: you still have the possibility to correct it.

The pilot on the video locked out
Jim Rooney - 2013/03/10 05:35:17 UTC

sure, don't rely on it (weaklink)... BUT... It can still help you even if you're not relying on it
You mean if you don't release when you have to ?
and then you have a look on weaklink breaks and this video give you the sense that we need weak weaklink ?
If this times and some other times you can notice breakings that replaces the release, what about all the other times that you can't afford to forget? :

- unnecessary breaking that requires you to take off and land one time more and double unnecessary risks (and double the bill too)
http://www.youtube.com/watch?v=MlIGsgNFRWM


- unnecessary breaking and blown downtube
http://www.youtube.com/watch?v=eTKIAvqd7GI


- unnecessary breaking at the worst moment (high AoA) and kill you:
http://4.bp.blogspot.com/-bRrpHNa68iY/UQ6Pv9gRZyI/AAAAAAAAjTg/Hc22bx5122Q/s2048/20943781_BG1.jpg
Image

- breaking in a lockout but mortal if it were closer enough to the ground
http://www.youtube.com/watch?v=F_n5B3-MIC4


- or not breaking before a late release in a lockout and were fatal if near the ground
http://www.youtube.com/watch?v=27yFcEMpfMk


-or not breaking at the "upper hand" position relative to the tug
Davis Straub - 2013/03/05 03:36:09 UTC

Had a great discussion about weaklinks and the tug's weaklinks with actual tug pilots today at Quest Air.
Davis Straub - 2013/03/07 14:05:23 UTC

Yah, we were discussing this the other evening at Quest Air after dinner at the Out of Control Bar. The hang glider pilot is quite capable of putting the tug pilot in danger by climbing up and up until the tug pilot has no control as his tail keeps being pulled up. The 130 lbs Greenspot loop won't break under this scenario, nor will the three strands on the tug. The tug pilot has to recognize what's going on and release the hang glider pilot. You don't want this to happen low and this can indeed happen right as the hang glider pilot comes off the cart and zooms up.
For that, definitively forget the weaklink as a security device for the (tug & hg) pilots.
For that too, definitely forget releases that need 2 or 3 attempts and aren't 100% reliable and immediately accessible without losing control
`
http://www.hanggliding.org/viewtopic.php?t=22540
LMFP release dysfunction
Diev Hart - 2011/07/14 17:19:12 UTC

I have had issues with them releasing under load. So I don't try to release it under a lot of load now.
http://www.hanggliding.org/viewtopic.php?t=21033
barrels release without any tension except weight of rope..
Bart Weghorst - 2011/02/25 19:06:26 UTC

I've had it once where the pin had bent inside the barrel from excessive tow force. My weaklink was still intact. The tug pilot's weaklink broke so I had the rope. I had to use two hands to get the pin out of the barrel.
No stress because I was high.
http://www.chgpa.org/forums/viewtopic.php?f=2&t=3107
I have a tandem rating!!!
Lauren Tjaden - 2008/03/23 22:20:15 UTC

When Jim got me locked out to the right, I couldn't keep the pitch of the glider with one hand for more than a second (the pressure was a zillion pounds, more or less), but the F'ing release slid around when I tried to hit it. The barrel release wouldn't work because we had too much pressure on it.
Anyhow, the tandem can indeed perform big wingovers, as I demonstrated when I finally got separated from the tug.
http://vimeo.com/40757858

password - red

And forget silly advices that are unusable in an emergency situation near the ground:
Brad Gryder - 2013/02/21 23:25:31 UTC

There's also a way to swing your body way outside the control frame so it stays up there while you reach out with one hand and release. Come on - do some pushups this winter. See if you can advance up to some one-arm pushups.
or pushing hard the bar to break the weaklink

Go for better instruction ("expect absolutely nothing good from your weaklink", critical situation recognition, "do right input or release ASAP" )
appropriate conditions to each level,
and an ultimate reliable equipment (2-hands-on-the-bar release and FAA's 1.4G weaklink) !!
ImageImageImage

Those are the ONLY things consistent you can offer to your students.
Note: In the original you have the password to Zack's video:

http://vimeo.com/40757858

as "RED". It's actually "red" - case sensitive - and won't work capitalized.
Jim Rooney - 2013/03/10 10:59:10 UTC
Deltaman - 2013/03/10 10:09:52 UTC

- unnecessary breaking that requires you to take off and land one time more and double unnecessary risks (and double the bill too)
Boo Fing Hoo buddy.
Yeah, Boo Fing Hoo buddy. It's the hang gliders who are taking all the real risks and paying the bills. No skin off the operators' and drivers' noses.
As I said...
Jim Rooney - 2013/03/10 05:35:17 UTC

Before you can put forth your inevitable BS other argument... a weaklink that allows you to get to a critical position close to the ground hasn't broken SOON ENOUGH.
It's breaking didn't cause the problem.. you did... by hanging on till things got really bad.

Cardinal rule for AT students... "Expect the weaklink to break at any moment what so ever. You should *never* allow yourself into a position where you are reliant upon the weaklink... if you are, then you failed to hit the release."

There is no time where a weaklink break should put you in harms way. If it does, you have failed, not it. You failed to hit your release.
You were hoping to "save the tow". Let go. Try again.
I sure hope that you end up in a pile of flaming wreckage some day and the only person around with access to a fire extinguisher is somebody you've pissed off a tenth as much as you've pissed me off.
Deltaman - 2013/03/10 11:35:35 UTC
Jim Rooney - 2013/03/10 05:35:17 UTC

There is no time where a weaklink break should put you in harms way. If it does, (..)
So now we are agree on that: if it does, it really can.
Jim Rooney - 2013/03/10 05:35:17 UTC

If it does, you have failed, not it. You failed to hit your release.
That is why we must do everything to make it as easy as the best equipment can afford: well built release and 100% reliable: high Load/Actuation force ratio and 2 hands on the basebar. All others should be thrown in the trash.
Weren't you listening to him when he told you his general rule about towing equipment? No funky shit?

The first thing we need to throw in the trash, compact, and incinerate is this motherfucker. Then we need to start picking off the assholes who made him possible.
Now don't forget all the times the weaklink was blown AND you do not want to release either. At his time nobody failed except the weaklink !
User avatar
Tad Eareckson
Posts: 9161
Joined: 2010/11/25 03:48:55 UTC

Re: Weak links

Post by Tad Eareckson »

http://ozreport.com/forum/viewtopic.php?t=31052
Poll on weaklinks
Davis Straub - 2013/03/10 12:04:42 UTC

I like and will keep my barrel release.
I can't begin to tell you how happy that makes me.

Image
http://ozreport.com/pub/images/fingerlakesaccident2.jpg
http://ozreport.com/pub/images/fingerlakesaccident3.jpg
Image
You can keep yours.
And I hope you sell lots of them - especially to people flying tandem and/or using them with the cool new orange weak links. More monkeys, more typewriters, more data.
Deltaman - 2013/03/10 12:38:20 UTC
Davis Straub - 2013/03/10 12:04:42 UTC

I like and will keep my barrel release.
Davis, do you mean this one?:

http://www.hanggliding.org/viewtopic.php?t=21033
barrels release without any tension except weight of rope..
Bart Weghorst - 2011/02/25 19:06:26 UTC

I've had it once where the pin had bent inside the barrel from excessive tow force. My weaklink was still intact. The tug pilot's weaklink broke so I had the rope. I had to use two hands to get the pin out of the barrel.
No stress because I was high.
http://www.chgpa.org/forums/viewtopic.php?f=2&t=3107
I have a tandem rating!!!
Lauren Tjaden - 2008/03/23 22:20:15 UTC

When Jim got me locked out to the right, I couldn't keep the pitch of the glider with one hand for more than a second (the pressure was a zillion pounds, more or less), but the F'ing release slid around when I tried to hit it. The barrel release wouldn't work because we had too much pressure on it.

Anyhow, the tandem can indeed perform big wingovers, as I demonstrated when I finally got separated from the tug.
And you keep flying them too, Lauren Eminently-Qualified-Tandem-Pilot Tjaden. Nothing makes me happier than reports of freak accidents out of shit holes like Quest.
The performance of a release is expressed in terms of a load to actuation ratio - L/A. The required actuation force associated with the release is a function of the mechanical advantage and internal friction of the device.
Well what do you want? Ability to release under load or ability to close your release over really thick ropes with no weak links?
The columns of the following table represent, in order:

- L/A ratio
- maximum:
-- permissible tow tension to remain within the 25 pound actuation requirement
-- load tested (also tested at all lower graduations)

Bailey bent pin barrel (yours)
06.2 - 0310 - 227.5 -
Image

Remote straight pin barrel (Tad's one slightly modified)
20.4 - 1020 - 300.0 -
Image

the 3 strings
+++

Image

Now your weaklink is 200lb and a loop breaks at 200lb.
That means you must develop : 200/6.2=32 pounds to actuate your Bailey at the maximum load while you would have need 200/20.4=9.8 pounds with the remote straight pin barrel.

32 pounds that is a lot in an emergency situation and hope that won't arrive before:
Image
Oh, take your numbers and shove them up your ass, Antoine.

See, the thing is... "they", the people that work at and run aerotow parks, have a long track record.
This stuff isn't new, and has been slowly refined over decades.
They have done quite literally hundreds of thousands of tows.
They know what they're doing.

Sure "there's always room for improvement", but you have to realize the depth of experience you're dealing with there.

It's a mystery why people choose to reinvent the wheel when they've got a proven system that works.
Zack C - 2013/03/10 13:20:43 UTC
Jim Rooney - 2013/03/10 08:12:02 UTC

90lb weaklink... you can barely stay on tow (if at all)
900lb weaklink... you can stay on tow into a very high stress and dangerous condition.
No one is talking about using anywhere near 900 lb weak links...
Sure someone is. Rooney is. And Rooney's saying you're talking nine hundred pounds. So you are.
Oh get over yourself.
Stronger than a weaklink.
Can you express that in lbs or as a percentage of a glider's MCOW or flying weight? I seriously don't know what you're talking about.
Of course not. You're not a tug pilot.
In one statement you seem to be OK with something 1.4 times MCOW and in another you're vehemently opposed to it.
Ah yes, the age ole "putting words in people's mouths" strategy.
You've said you refuse to tow people with doubled up 130. You think doubled up 130 breaks at 260. 260 is 1.1 times an S2 175's MCOW.
Jim Rooney - 2013/03/10 08:12:02 UTC
Jim Rooney - 2013/03/05 21:40:02 UTC

tow with a WEAKER weaklink... you won't be able to achieve a high AOA.
Just because something does something, doesn't mean you're "relying" on it to do so.
Are you saying then that a weaker weak link won't always prevent a high angle of attack? 'Won't be able to achieve a high AOA' sounded pretty definitive to me.
Davis Straub - 2013/03/10 13:28:07 UTC

I'm happy that Deltaman likes his release.
Fuck you, Davis.
Deltaman - 2013/03/10 13:31:48 UTC

Davis, that's not all about love but efficiency !
32.2 pounds vs 9.8 required actuation force makes a lot of difference.
..maybe one life ?
Davis Straub - 2013/03/10 14:09:22 UTC

Maybe not.
But we can always hope, can't we?
I've had no problem releasing my barrel release hundreds of times.
- Flying Marzec Links, probably not.

- But then again, it's always the one time that it might as well be on the moon...

Image
Image

...that we keep rooting for.
Marc Fink - 2013/03/10 14:21:03 UTC

i have extensively studied weaklinks for decades, and all my research suggests that use of strong weaklinks leads to use of harder drugs.
Fuck you, Marc.
Deltaman - 2013/03/10 14:47:09 UTC

My car has bad brakes. I drove thousands miles and I have had no car accident..
The efficiency of my release is far from optimal. I released hundreds of times and I have had no problem..

What I understand is that up to now you never encounter any 200lb situation near the ground in which very high actuation force was required

Look at 01m05s how easy that is for him
http://www.youtube.com/watch?v=3FoJoZ0fEDg
[video]http://www.youtube.com/watch?v=3FoJoZ0fEDg[/video]
Freedomspyder - 2013/03/10 15:44:47 UTC
Davis Straub - 2013/03/10 12:04:42 UTC

I like and will keep my barrel release. You can keep yours.
Davis, Do you manufacture the weaklinks for sale on ozreport, or are you reselling for someone?
No, he "manufactures" cheap bent pin shit barrel releases and cheap long, thin bulgy-at-the-ends pro toad bridles. But his reputation and the reputations of everyone with whom he maintains his incestuous relationships are heavily tied up in 130 pound miracle fishing line.
Swift - 2013/03/10 17:23:46 UTC
Davis Straub - 2013/03/10 12:04:42 UTC

I like and will keep my barrel release. You can keep yours.
Sure he can keep it but will Jim Rooney, tow him with it?
Sure, just as long as it's an accepted standard.
Will he also be able to tow with a weak link value more consistent with FAA recommendation?
Sure...

http://ozreport.com/forum/viewtopic.php?t=15716
weak links
Davis Straub - 2009/04/26 22:15:56 UTC

Yup, at least 175 pounds- single loop of Cortland Greenspot 130 pounds test.

That was one end of the loop in a barrel release where the edges are a bit sharper than where I normally connect the weaklink loop with cloth loops at both ends.

I was jumping a bit so it is more than 175 pounds. Maybe 200+.
Dr. Trisa Tilletti - 2012/06

We could get into details of lab testing weak links and bridles, but this article is already getting long. That would be a good topic for an article in the future. Besides, with our backgrounds in formal research, you and I both know that lab tests may produce results with good internal validity, but are often weak in regard to external validity--meaning lab conditions cannot completely include all the factors and variability that exists in the big, real world.

What we have covered in this article is practical information and knowledge gleaned from the real world of aerotowing, developed over decades and hundreds of thousands of tows by experts in the field. This information has practical external validity. Hopefully, someone will develop methods and technology that work better than what we are using as standard practice today. Like the methods and technology used today, it is unlikely that the new technology will be dictated onto us as a de jure standard. Rather, to become a de facto standard, that new technology will need to be made available in the marketplace, proven in the real world, and then embraced by our sport.
Davis Straub - 2013/03/06 18:29:05 UTC

I'm thinking about doing a bit more testing as there seemed to be some disagreement around here about what the average breaking strength of a loop of Greenspot (or orange) weaklink was.
As long as these motherfuckers can keep pissing all over the people who've done the actual bench tests on the focal point of the safe towing system and calling the strengths whatever's convenient at the moment.
So far, this doesn't seem to be the case and the arguments against doing so are not very convincing.

This picture, on the other hand, is very convincing.

http://www.flickr.com/photos/aerotowrelease/8331326948/
Image
Thank you.
It's all about leverage.
Nah. This is aerotowing - so it's all about opinion, depth of experience, and track records.
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