Weak links

General discussion about the sport of hang gliding
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Tad Eareckson
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Joined: 2010/11/25 03:48:55 UTC

Re: Weak links

Post by Tad Eareckson »

http://www.youtube.com/watch?v=HNXZwfR-MyY
1st Aerotows

Great, Dave! You got through fifty percent of them, one out of two, without breaking your Rooney Link as a consequence of aerotowing behind a Dragonfly in smooth air. Fuckin' ASTONISHING when you compare it to the batting average of...

http://ozreport.com/forum/viewtopic.php?t=24846
Is this a joke ?
Davis Straub - 2011/08/28 15:26:28 UTC

Then again, Russell Brown had us double up behind him after six breaks in a row at Zapata. We couldn't figure out why we had so many breaks so quickly. Maybe just coincidence.
...a bunch of world record seekers in pretty much the same conditions. Maybe Davis and Russell can fly you in next year so's you can demonstrate your technique and give those guys some pointers.

http://www.youtube.com/watch?v=HNXZwfR-MyY


03:52
I think either he released me or something broke.
If he had released you wouldn't you have gotten stuck with 250 feet of Spectra?
...in the ... when that happened?
I think so.
Oh yeah, you broke right here. So you were probably...
No shit, Tina. That's the kind of analysis that makes you aerotow professionals worth every penny of what you're getting paid.
I wasn't doing something right.
Yeah, whenever a piece of fishing line off the bottom the legal range allowed for sailplanes and xeroxed by a bunch of FAA total douchebags to incorporate hang gliders pops it's always 'cause the muppet on the glider was doing something wrong - AFTER he got airborne.
Yeah, you were just... Might have been locked out a little bit.
Yeah. Locked out A LITTLE BIT. One of these really minor lockouts that you don't really notice unless you have a lot of experience and really know what to look for. That's why you need to fly with an appropriate weak link of 1.5 inches or less. It can detect these extremely subtle lockouts that only the best of the best will notice and break before you can get into too much trouble - WAY before you can get into too much trouble.
Um... The... Um... But... OK when you first...
STOP. This is the most intelligent part of your postflight analysis. Don't spoil it by entering back into the realm of sentences.
You came off the cart really great, very great, then you PIOed a little bit, and then you settled down and you were towing WELL. And then I didn't see you when you... you know... broke off.
You didn't really need to. It obviously broke when he was locking out a little bit. It certainly wouldn't have broken unnecessarily due to turbulence because that's contrary to our expectation. It undoubtedly broke as early as possible in a lockout situation - consistent with your analysis.

And this is a proven system that works and has an extremely long track record.
Yeah, I think I... uh... I was starting to get a little low and come up a little bit and then... I think I got outside a little bit and that's what did it.
Yeah...
Yeah Dave, that's probably what you did. Keep honing your skills. You'll be able to stay inside the center of the Cone of Safety like you're on rails and learn to react quickly enough that you can pro tow with even greater safety margins than you can on three point.

25-23223
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We'll get you...
19-03703
http://c2.staticflickr.com/6/5529/14422573378_5385a9a99a_o.png
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...a new one of these...
21-04709
http://c2.staticflickr.com/4/3885/14422571978_d47ec5c921_o.png
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And DO try to pay careful attention and stay in the center of the Cone of Safety a little better this time. When you lock out a little bit it tends to make things a bit inconvenient.

And make sure you install it with the knot well hidden from the main tension in the loop. It'll break much more consistently that way.
Yeah, you came off the cart very nice and then you tried to PIO but you just settled down right away....
Yes Tina. He TRIED to PIO.

Were you always this astonishingly stupid or is it just something that inevitably happens to people after they run Dragonflies for a weekend or two?
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Tad Eareckson
Posts: 9161
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Re: Weak links

Post by Tad Eareckson »

http://www.hanggliding.org/viewtopic.php?t=30306
Non-fatal crash in Tres Pinos, CA
Greg Laabs - 2013/11/11 08:45:01 UTC
Novato, California

There was an incident today (2013/11/10) at the training hill in Tres Pinos.

A pilot's glider...
...as opposed to a backhoe operator's glider...
...broke in flight, and he failed to deploy his parachute. He survived.

I wrote up the best account I could of the incident here:


Adventures in Hang Gliding
Adventures in Hang Gliding
2013/11/10
Today I witnessed a hang glider crash.
Oh good - you didn't say "accident".
The pilot survived. I feel that it's important for me to write out all of the facts about the incident first...
Yes.
...and then I'll give my own thoughts.
Oh good - you didn't say "opinions".
The incident occurred at the Tres Pinos training hill in California.
Mission Soaring Center strikes again.
A pilot was being towed...
A person was being towed anyway.
...and after release something happened (I'll return to this later) that caused his glider to break mid-flight.
So he was OK while he was on tow going up and didn't have any trouble until he was off tow going down.

http://www.chgpa.org/forums/viewtopic.php?f=2&t=2467
weak links
Jim Rooney - 2007/08/01 19:49:30 UTC

It's more of this crappy argument that being on tow is somehow safer than being off tow.
How curious.
The pilot did not deploy his parachute and impacted the ground hard.

The owner of the site and the tow operator...
Has he got a name? Is there some reason you're not making it public?
...were first to arrive at the crash site, with a fellow student and me arriving a minute or two after.

The fellow student was a professional physician, and was able to immediately start doing what he could for the situation.
Did he have any comments on the prevention versus cure thing?
Minutes later, the ambulance arrived, followed by a fire engine and then a police officer. Eventually a helicopter arrived which took the injured pilot to a trauma center.
Was the helicopter equipped with any safety devices which would instantly kill the power in the event the climb got a wee bit on the steep side for a moment or two?
The pilot had an obvious major fracture of his right femur - it was not an "open" fracture, but the bone was causing a large lump in the hip area. He was conscious, and while there was nobody at the scene when he crashed, there was no indication that he had lost consciousness. He could feel all of his limbs and wiggle his toes, and knew where he was and what had happened. He was, obviously, in a great deal of pain.
Well, at least he came to be in a great deal of pain doing what he loved.
A couple people and I surveyed the area for the video camera that had been attached to the glider, but was missing at the crash site. We located it upwind from the crash, where it presumably had landed after coming detached in flight. It was still recording when I found it. The camera was taken with the pilot in the helicopter.
I hope nobody inadvertently swallows the card.
As for what happened in the air: I didn't personally see it. I saw the descent after the glider had broken, and it was clear that both leading edge tubes had broken about half way down and the tubes after the break were pointing straight up. It's hard to estimate the amount of time I watched him descend in retrospect (time slowed down and all that) but I would guess it was at least six seconds.

I am now going to give an account of what caused the glider to break, but I am going to repeat myself first: I did not witness this part. Everything after this point is what I understand second-hand from those that were watching his flight. Everyone who observed the flight was at least 1500 feet away.
Was the tow operator watching his flight? Have you got a link to his report on the incident or do we have to wait for it to come out in the magazine?
He towed to about six hundred feet. Shortly after releasing the tow line...
It's been confirmed that he released? Was six hundred feet the target altitude?
...he entered a "whip stall".
Sounds...

http://groups.yahoo.com/group/flyhg/message/17223
Pilot's Hotline winter flying
Mark Frutiger - 2013/02/03 13:41

Yesterday was a light and variable day with expected good lift. Zach was the second tow of the afternoon. We launched to the south into a nice straight in wind. A few seconds into the tow I hit strong lift.

Zach hit it and went high and to the right. The weak link broke at around 150 feet or so and Zach stalled and dropped a wing or did a wingover, I couldn't tell. The glider tumbled too low for a deployment.
...strangely familiar.
The glider then either dropped its nose sharply (one account) or continued into a too-slow loop (another account) - either way...
Stay with "dropped its nose sharply".
...the pilot ended up upside-down for an unknown amount of time, and somewhere in the mix is when the wings broke. Update: a hang gliding forum poster who witnessed the event posted his own observations on the forums. You can read them here:

http://www.hanggliding.org/viewtopic.php?t=30306
Non-fatal crash in Tres Pinos, CA

Nobody can be sure why he did not throw his parachute, although the camera footage may give some insight.
Nothing that happened - or didn't - subsequent to the whipstall really matters.
The glider was a Pacific Windcraft Mark IV 17.

This was the worst injury that has occurred in this site's long history.
Doesn't matter. Lin Lyons got his parachute out on 2013/06/15 - less than five months before this one - and came out smelling like a rose. For the purpose of the exercise both of these guys were killed just as dead as Zack Marzec was.
Witnessing a serious crash first-hand was traumatic. The agonizingly long drive to the crash site (all of sixty seconds or so) gave me way too much time to think about the likely possible outcomes that were much worse than what it ended up being.
Keep thinking about those likely possible outcomes that were much worse than what it ended up being. That'll make for better motivation for getting to the bottom of this and fixing the problems.
I make it a habit to read about every hang gliding incident that happens.
No you don't.

http://www.hanggliding.org/viewtopic.php?t=20756
How is Zach Etheridge doing?
Bob Flynn - 2011/02/04 11:26:34 UTC

Lookout keeps this kind of stuff under their hat. You never hear of accidents there. But every time I go there, I hear about quite a few. Blown launches, tree landings, etc.
You make it a habit to read about every hang gliding incident that gets reported.
There's an entire subforum on the hang gliding forums dedicated to discussion of incident reports.
- Yeah. Just be very careful about what you post there...

http://www.hanggliding.org/viewtopic.php?t=30199
Incident - 2013/06/16
Paraglider Collapse - 2013/10/28 04:54:30 UTC

Well, I'm certainly glad I clicked on this pointless quote of an old report.
Most of the Jack Show crowd would so much rather hear about how well you nailed that traffic cone Sunday afternoon.

- There's an entire forum over here primarily dedicated to the issue of hang glider crashes and the discussions that the hang gliding industry really doesn't want anybody to hear. And if you were really interested in these issues you'd have had a real hard time remaining ignorant of its existence and been participating over here.
Studying the activities of others is an important part of the sport...
Studying why many of these activities are tolerated, fostered, mandated by the culture and industry and remain important parts of the sport is even more important if you wanna get through the sport in a condition similar to what you had when you went into it.
...and I have learned a lot from the discussions that take place around the incident reports.
Which is another way of saying that the instruction your paying for at that shit heap sucks.
But watching a YouTube video of someone else's crash is nothing like seeing it happen in person.
Correct. When all we have are accounts from people seeing it in person it's a lot easier for Industry/USHGA sleazebags to put the desired spin on things.
I hope that the pilot chooses to share his footage with the hang gliding community once he has recovered so we can all learn from it.
Whatever's on it there will be absolutely nothing to learn from it. We're not inventing new ways to crash hang gliders.
Ultimately it is and should be his decision.
Yeah, if he sits on it he can probably get a good chunk of his medical expenses taken care of by Mission Soaring Center and USHGA.
Hang gliding is a dangerous sport.
Overwhelmingly by design.
Whether or not it's more dangerous than motorcycling, rock climbing, skydiving, and other such risky activities is a matter for endless...
...and totally useless...
...debate, but in the end it would be silly to claim that it is without considerably elevated risk, especially compared to my other hobbies which pretty much all take place at a desk.
The risks of this sport are overwhelmingly generated by people sitting at desks. Dennis Pagen, Dr. Trisa Tilletti, Mark Forbes, Tim Herr come to mind immediately.
I'm signing up for the next parachute clinic (a class to learn how to and to practice deploying a reserve parachute) that Mission Soaring offers.
Yeah. Good move dude. If you're gonna continue training with Mission Soaring Center...
The Mission Soaring Hang Gliding school provides professional training on state-of-the-art equipment at our dedicated training site at Tres Pinos (near Hollister, CA)... just south of the San Jose / San Francisco Bay Area.
...under their professional training using their state-of-the-art equipment at their dedicated training site...

162-20727
http://farm9.staticflickr.com/8576/16673571861_3962427127_o.png
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...at Tres Pinos it would be an excellent idea to sign up for as many of their parachute clinics as possible. And if you're gonna take swimming lessons at a facility on the Zambezi River it would be a good idea to attend a few herpetology seminars during the downtimes.
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Tad Eareckson
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Re: Weak links

Post by Tad Eareckson »

http://www.hanggliding.org/viewtopic.php?t=30306
Non-fatal crash in Tres Pinos, CA
Walt Conklin - 2013/11/11 14:53:05 UTC
Montana

Good write-up.
Yeah. It was - especially in comparison to Pat Denevan's write-up.
Hope all is well with the pilot.
It's not. He got very seriously and expensively fucked up and a good chunk of the quality portion of his life has gone irretrievably down the toilet - undoubtedly for no good reason.
Dave Hopkins - 2013/11/11 15:13:52 UTC

Nice write up . Thanks.
The first question that comes to mind is Did the weak link break causing the glider to pitch up or did the pilot release under load and not control the pitch.
No fuckin' way.

The purpose of the weaklink is...

http://ozreport.com/forum/viewtopic.php?t=24846
Is this a joke ?
Jim Rooney - 2011/08/26 02:44:10 UTC

The "purpose" of a weaklink is to increase the safety of the towing operation. PERIOD.
...is to increase the safety of the towing operation - PERIOD - and the worst possible consequence of a weak link blow is...

http://ozreport.com/forum/viewtopic.php?t=24846
Is this a joke ?
Jim Rooney - 2011/08/28 10:15:12 UTC

Any time someone starts in on this "sole purpose" bullshit, it's cuz they're arguing for stronger weaklinks cuz they're breaking them and are irritated by the inconvenience. I've heard it a million times and it's a load of shit. After they've formed their opinion, then they go in search of arguments that support their opinion.
...a bit of inconvenience.
Jim Rooney - 2011/08/31 09:25:57 UTC

You've not heard about strong-link incidents.
Uh, yeah... cuz we don't let you use them.

"light" weaklink issues?
"I had to land"... boo hoo.
Oh, I thought of an other one... I smashed into the earth after my weaklink let go cuz I fly as badly as I tow, and I'm only still here cuz my weaklink didn't let me pile in harder.
"I had to land"... boo hoo.

Possibly a premature/accidental release or towline failure - those are REALLY dangerous - but no way a simple, routine weak link pop.
Either way the pilot should have been able to control the pitch.
Sure Dave...

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Same way Dragonfly jockeys SHOULD be able to control the pitch when THEY have catastrophic power failures.

Image

Asshole.
Tom Galvin - 2013/11/11 15:48:20 UTC

Is this the same place where earlier this year this happened?

http://vimeo.com/68791399
Yes. Why do you ask?
Steven Murphy - 2013/11/11 16:32:32 UTC

yes, same site
Hope we get a good video out of this one so we can help them advertise some more.
Allen Sparks - 2013/11/11 17:50:32 UTC

Thanks for the write-up, Overload
It is good that the pilot will survive.
I think his goals for the day had been a bit loftier than that.
keying from Tom's question regarding the site ... would you be willing to identify the tow operator and describe the tow system used?
What difference does it make? They're all excellent operators and their equipment is...
The Mission Soaring Hang Gliding school provides professional training on state-of-the-art equipment at our dedicated training site at Tres Pinos (near Hollister, CA)... just south of the San Jose / San Francisco Bay Area.
...state-of-the-art.
Erik Boehm - 2013/11/11 18:09:30 UTC

I can tell you the owner/person in charge of the school (as I think many on this site can), but I can't tell you the specific person directly operating the winch.

They didn't use the tow system when I took lessons there to a H1, but my brother (on this site, Jason) did some towing there when getting his H2, and may be able to describe the system... assuming it hasn't changed in ~12 years or so....
No, it hasn't changed in the past dozen years or so. If you're using state-of-the-art equipment what possible reason could you have doing anything else?
Doug Doerfler - 2013/11/11 18:22:34 UTC

From the report its not looking like the accident...
The WHAT? Overload didn't say anything about an accident.
...had anything to do with type of winch or opporator
Depends a bit on how you define the responsibilities of the operator.
the glider was a Mark IV...the gliders air worthyness should be the focus...this glider should not be doing what was explained
What should Zack Marzec's...

http://ozreport.com/forum/viewtopic.php?t=30912
Death at Quest Air
Paul Tjaden - 2013/02/03

Weather conditions were very benign with light winds and blue skies and the glider was in good airworthy condition.
...Moyes Xtralite have been doing?
I have towed there on a pulse, U2 and T2C, 50+ tows total
Got my hang 2 towing there on a pulse
And you'd recommend it to anyone else without reservation?
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Tad Eareckson
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Re: Weak links

Post by Tad Eareckson »

http://www.hanggliding.org/viewtopic.php?t=30306
Non-fatal crash in Tres Pinos, CA
Joel DeWitt - 2013/11/11 18:22:43 UTC

I watched the event happen. It was an upsetting day. Various people can watch the same event and report seeing different things.
Especially the assholes running and responsible for the operation. Invisible dust devils and bullet thermals were quite popular earlier this year.
Here is what I think I saw. I was at the front of the tow line, talking with the pilot who would have been next to tow (my son). I'm a long-time pilot, and know the difference between a failed loop and a tumble.

Conditions were good...
For what?
...and I was paying half attention to the guy towing up.
I so do hope we get a name eventually.
The tow seemed to go fine, and I noticed the release out of the corner of my eye but was not watching carefully.
How do you know it was a release and not an uncommanded separation?
I did see the glider go to an extremely high angle of attack right after when I assume he released...
Don't ASSUME that he released. I'd wager that he didn't. I'm thinking (really hoping) that he got blown off by Peter's...

http://www.birrendesign.com/LKOpinions.html
Linknife - alternate setup as automatic release
2002 - Pat Denevan is using a "nose line" as an automatic release with great success...
...idiot fucking Pitch and Lockout Limiter doing what it was birrendesigned to.
...it looked like a landing flare.
Which violates the placard limitation for pitch.
At that point my full attention was on the situation. I saw the nose fall, and the glider entered a near vertical dive. It looked to me like the sail was positively loaded and I thought things might work out OK.
Like this one:

http://www.youtube.com/watch?v=UMsIkAOeJ0I

19-1514
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24-1701
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26-1716
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did - just barely.
But then the nose tucked and the glider tumbled.
You can stop here. We don't need to know what happened next. Actually... We didn't need to know anything beyond the point at which the glider was suddenly off tow and stopped with its nose pointed way up.
After the first rotation, one of the leading edges had broken just beyond the crossbar joint.
Junction.
The glider did another revolution and the other leading edge broke. I think the glider had gone through two revolutions at this point. Then it stabilized, with the pilot below the glider. The glider was at a reasonable angle of attack, both outboard wings broken, and descending fairly rapidly. It seemed to me the nose dropped shortly before impact, but I'm not sure.

I believe the glider was a Vision Mark IV. I was too far away to have visibility of the pilot's control motions.
Then you're probably too far away to determine why the glider came off tow.
We were all hugely relieved that the pilot survived. He's a cheerful and enthusiastic guy.
Probably considerably less so at this point in his life.
My best wishes for his recovery. /jd
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Tad Eareckson
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Re: Weak links

Post by Tad Eareckson »

http://www.hanggliding.org/viewtopic.php?t=30306
Non-fatal crash in Tres Pinos, CA
Steven Murphy - 2013/11/11 18:25:46 UTC
Bay Area

I did all my training there and even acted as tow assistant for a time.
Steven Murphy - 90241 - H3 - 2011/09/24 - Patrick Denevan - FL ST 360 FSL
What's a tow assistant do? Does he check to see that the three-string is properly connected? (Don't believe we heard you weigh in on any of the Lin Lyons discussions.)
It's a static tow rig with the operator about ten yards left of the pilot.
It's as STATIONARY winch. In the US "static" refers to fixed line.
Kevlar line...
I REALLY doubt it. I'm guessing Spectra.
...is a loop that goes 3/4 mile straight out and back in a very clear and open field. The fact that the pilot released at 600' tells me he is either new to hang gliding or new to towing.
- DID he release at six hundred?
- How far out was he?
- If he didn't know what he was doing who's fault is that?
Tim Dyer - 2013/11/11 18:39:41 UTC
Las Vegas

tow pressure too high?
- Get fucked.
- The tow "PRESSURE" was ZERO when things went south.
or pilot pushed out?
Yeah, he was undoubtedly a total moron and pushed out when he came off tow.
this is a bummer either way. Confused
Then shut the fuck up - at least until you can figure out the difference between pressure and tension. Asshole.
Greg Laabs - 2013/11/11 19:18:16 UTC

Thanks for the better description of the actual in-air part of the incident, Joel. I had only heard the descriptions of what happened second-hand, and I don't believe I ever spoke to you about it. It's nice to get a more detailed account of what you saw first-hand.
And absolutely nothing useful about the critical point in this incident.
As for describing the tow system - I fear that my lack of experience with towing systems would lead to a woefully inaccurate description of the system if I attempted to explain it.
It's fishing gear. It reels a line in with something on the end of it. It's not all that complicated.
I just achieved my H-1 this weekend and have only done my very first thirty foot baby tow to get acquainted with how the system feels.
How 'bout at least telling us what HIS rating/experience was?
Dave Hopkins - 2013/11/11 23:14:00 UTC

Any idea of the pilots experience? There are a lot of things that sound like the pilot was inexperienced in towing and flying in general.
How 'bout THIS one?

25-23223
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The Tres Pinos guy at least did a much better job of not dying.
Also suspect is the glider. One weakness is the nose wire that was a loop with a nico compression in the middle. This has failed before and should be changed on these gliders. I would hope the tow operator would know this and not tow a glider with this nose wire setup.
BULLSHIT. Yeah, that "design" is crap. But the glider was load tested and HGMA certified with it and it hasn't failed in flight due to the design.
If the nose wire broke that would cause much of what was described.
BULLSHIT. If it had failed the control frame would've folded back, because he WAS stuffing the bar, and the wings would've folded up. It would've been physically impossible for the leading edges to fail just beyond the cross spars junctions.
But that should have been noticeable to observers.
So why bring that crap up? The glider whipstalled, tucked, tumbled, and failed. We don't need any idiot crap thrown in to explain what happened in that phase of the disaster.
An inexperienced...
...young...
...pilot might be freaked out by a weak link break in a thermal gust (TIME OF DAY?) pitching up and then pushing out too soon in the ensuing dive and causing a tumble.
Bullshit.
Such as the u2 pilot did last spring?
You mean the inexperienced tandem aerotow instructor flying the Moyes Xtralite last winter?
I'm just guessing ,
Don't guess. Don't even talk.
...but there are a limited no. of problems that would cause such a scenario.
A whipstall resulting from popping off tow. That's ALL you need to set things in motion. Here's a reasonably good approximation:

http://www.youtube.com/watch?v=_nkEQtj08us


This ain't rocket science.
Still wonder why no chute deployment?
How 'bout 'cause he was whipstalling, tucking, tumbling, breaking up, scared shitless, and only has about half a dozen seconds at his disposal? Lin here:

http://vimeo.com/68791399


is in great shape - relatively speaking - and it takes him about seven seconds to get the bag out.
I glad to hear the pilot is doing well. maybe he will clear it up with a video.
But in the meantime do feel free to continue mudding the waters with loads of lunatic bullshit.
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Re: Weak links

Post by Steve Davy »

Tad Eareckson wrote:Don't ASSUME that he released. I'd wager that he didn't. I'm thinking (really hoping) that he got blown off by Peter's idiot fucking Pitch and Lockout Limiter doing what it was birrendesigned to.
Me too! But my money is on a release malfunction or weak link.
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Tad Eareckson
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Re: Weak links

Post by Tad Eareckson »

I want it to be a Birren Pitch and Lockout Limiter.

I'm pretty sure Mission knows how the glider came off tow.

- If the weak link blew they'll have a fuzzed remnant or two.

- If the Pitch and Lockout Limiter was left engaged and kicked in and it's based on a Linknife - and I'm pretty sure it is - there will be a cleanly cut (weak) link.

- I don't think it was an accidental release because the three-string is pretty reliable unless the lanyard is on the wrist - and I'm pretty sure it's rigged like Lin's was. And it's pretty easy to differentiate closed and open three-strings.

- And they have a pilot who probably never lost consciousness and probably remembers exactly what happened.

- And there's a video card that nobody from Mission got an opportunity to swallow.

So odds are pretty strong that Mission knows exactly what happened and that means that the odds are equally strong that they're suppressing the information.

It would be most convenient for them if the weak link blew 'cause these motherfuckers have the whole planet conditioned to believe that weak links are supposed to blow any time the glider gets pointed two degrees off from the center of the Cone of Safety and Quest/USHGA just totally got away with the Zack Marzec murder by fishing line. So it's probably not the fishing line.

It would be most INconvenient for them if the Birrenator (©) kicked in 'cause nobody else uses that deadly lunatic piece of shit and several of us are on the record...

http://www.ushawks.org/forum/viewtopic.php?f=2&t=607
Understanding Tow Releases
Peter Birren - 2011/08/29 18:40:45 UTC

Tad, you ignorant slut, if you read further than your selective snipping reaches to somehow prove a point, you would have read how this works. And, pray tell, what is the title of that page? Could it be "opinion"? as in a thought/idea. Surprising, isn't it, that I've heard from a couple of instructors (both with more credibility in their little fingers than you have in your self-inflated ego) who have been using similar systems for years to prevent hazardous scenarios from happening... and it works. But you'll never consider what actually works, just your own concepts of reality.
...calling it a deadly lunatic piece of shit.

If they either continue to suppress the information or claim they can't make a determination we can claim that he got Birrenated because it's a perfectly logical/rational explanation and that's exactly what it's designed to do. And the only way they'll be able to contradict us is to say they have no idea what happened. And that's not a contradiction.

I'm nearly beside myself with joy right now.
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Tad Eareckson
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Re: Weak links

Post by Tad Eareckson »

http://www.hanggliding.org/viewtopic.php?t=30306
Non-fatal crash in Tres Pinos, CA
Stephan Mentler - 2013/11/11 23:14:28 UTC
Pensacola

Long shot question - had the glider had a sail off inspection where the luff line sail trailing edge was evaluated to ensure they were in specs?
Yeah. Take the sail off to check the luff line adjustment. Lemme know how that works for you.
This is especially importing with the older gliders as the sail stretch/shrinkage impacts the pitch stability systems.
Sails don't stretch - they shrink.
So while you may never know what exactly caused the stall...
Everybody outside of USHGA and the Flight Park Mafia knows EXACTLY what caused the stall. What we don't know is HOW the glider came off tow.
...it is important to know why the luff lines did not engage to right the glider's angle of attack relative to the ground.
- There's no such thing as an angle of attack relative to the GROUND. Angle of attack is ONLY relative to the airflow and the ground is totally irrelevant - until you hit it anyway.

- It doesn't fucking matter why the glider didn't pull out. ANY hang glider WILL tumble if the stall is severe enough. And popping off tow is by far the most common cause of dangerous stalls in hang gliding. And the most common cause of popping off tow is 130 pound Cortland Greenspot braided Dacron trolling line.
Jason Boehm - 2013/11/11 23:39:54 UTC

I don't think I've ever heard of a mark IV tumbling.

lots of questions on this one
How come you didn't have any questions or comments on Zack Marzec - dickhead?
Diev Hart - 2013/11/12 01:49:47 UTC

Not again :-( ....they are towing new students with a converted toyota truck motor winch....
- How the fuck do you know this guy was a new student?

- So fucking what? I missed the parts where they were saying that he was being towed at full power or that there was anything unusual looking about the tow up to the point of separation.

- This wasn't a goddam ground skimming introductory scooter tow and wasn't intended to be.
What will it take....to realize these new students don't usually have the understanding of all that is going on while towing (like this)....just sad....AGAIN !!!!!!
Get fucked.

- There is ZERO evidence to indicate that this guy's understanding of towing is half an inch south of that of any of the shitheads running Quest, Wallaby, Florida Ridge, Lookout, Manquin, Ridgely, Cloud 9, Cowboy Up, Wannabe, USHGA, HPAC, BHPA, DHV, or HGFA.

- Don't you DARE...

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.
...talk about ANYONE'S understanding of ANYTHING going on in towing.
Devin Wagner - 2013/11/12 02:06:48 UTC
Yankton

where was the 300Lb weak link
Vaporizing if it was in any way relevant to this incident.
Steve Morris - 2013/11/12 02:08:20 UTC

I've never towed a flex wing there but I did tow in my Millennium two years ago. This was my first experience ground towing and the angle during climb out was quite surprising to me. This photo has been rotated so you can see the climb angle relative to the horizon. Not a big deal if you're a pilot used to aerobatics but I'm not!

Image
You can kill anybody you want - especially pro toads - by popping a glider off tow under circumstances common in thermal conditions. A stall doesn't give a rat's ass how many consecutive loops you can do from five thousand feet. And Ryan Instant-Hands-Free-Release Voight can't stuff a bar any faster/farther/better than a solid Hang 1.0 - especially now that he's fucked up his shoulder on one of his famous foot landings.
Steve Corbin - 2013/11/12 02:31:21 UTC
Crestline

It is very important to inform new pilots that the glider is tailless, and is susceptible to tucking and/or tumbling under the right conditions.
Image
Pilots must be taught that they should always be Spring-Loaded to the Pulled-Way-In position if for any reason the glider enters a steep nose-up attitude.
Pilots must be taught that towing hang gliders is inherently dangerous and that if you get hit by the right shit at the right altitude there's not gonna be a goddam thing you can do to keep your ass alive - contrary to the total rot being taught at Cloud9 and published in the magazine and excellent book, Towing Aloft, by Dennis Pagen and Bill Bryden.

They also must be taught that the one thing that's most likely to crash and injure or kill them is a fucking tow operator who uses a weak link to increase the safety of the towing operation.
Towing students must be taught that things don't always go as planned...
Towing students must be taught to assume on EVERY launch that the situation will go critical at twenty feet and to fly and equip themselves for the maximum control and safety margin possible.
...that a rope break, weak link break, or some other human or equipment failure can result in the glider "zooming" into a very high nose-up attitude.
- I beg to differ.

-- Yes, a ROPE BREAK is extremely dangerous tow system failure that can kill you in a heartbeat. But a WEAK LINK "failure" is actually a SUCCESS! It's doing what it's designed to do and the safety of the towing operation is automatically increased.

-- The human side isn't really much of an issue. Your tow driver always has the ability to fix whatever's going on back there by giving you the rope. And, if you survive, you should always thank him for intentionally releasing you, even if you feel you could have ridden it out, because he should be given a vote of confidence that he made a good decision in the interest of your safety.

- It doesn't "zoom up" - it STOPS zooming up and instantly STALLS.
That a steep nose-up angle can and probably will result in a tailslide. That a tailslide will result in a Tuck.
You mean like:

http://www.hanggliding.org/viewtopic.php?t=28290
Report about fatal accident at Quest Air Hang Gliding
Paul Tjaden - 2013/02/07 23:56:42 UTC

The glider was a Moyes Xtralite. This glider was a fairly old design. I believe the last ones built were in the mid 1990's, but it was in good, airworthy condition and rigged properly. I know of no reports that this glider is difficult to tow or has any deficiencies for aero towing but I am not an expert on it and have never flown one. The glider hit base tube first and sustained very little damage upon impact so it was easy to ascertain that the glider did not appear to have had any structural failure that would have caused the accident.

The tow aircraft was a Moyes Dragonfly with a 914 Rotax engine and was piloted by a highly experienced tow pilot. The tow line was approximately 250 feet long which is standard and Zach was using the "pro tow" method where the tow line is attached directly to a bridle on the pilot's harness and is not attached to the glider at all. A standard 130 pound test weak link was being used.

Another pilot had launched with no issues immediately before the accident. The launch started on the main runway at the north end (2,000 feet long) and was normal until at approximately fifty feet in altitude when the tow plane hit extremely strong lift elevating it quickly and abruptly. Because of the length of the tow line, it was a few seconds later when Zach's glider entered the same strong lift and he was at an estimated 100 to 150 feet in altitude at this time.

When the lift/turbulence was encountered, the weak link on the tow line broke as the nose of the glider pitched up quickly to a very high angle of attack. Apparently, the glider stalled or possibly did a short tail slide and then stalled and then nosed down and tumbled. Eye witnesses said the glider tumbled twice and then struck the ground with the base tube low. Due to the extremely low altitude, there was no time for the pilot to deploy his reserve parachute.
THAT?
That a Tuck will result in a Tumble unless corrective action in the form of getting as much weight as far forward as possible is taken immediately.
What if you're a pro toad...

06-03114
http://farm4.staticflickr.com/3728/9655895292_f4f808fb0e_o.png
Image
Image
http://c2.staticflickr.com/4/3736/9632673944_d61e600757_o.png
1-11012c

...and already have your weight about as far forward as possible just to keep the glider level with the tug in smooth air at normal tow speeds? Might that be an insurmountable issue when the shit's hitting the fan?
That pulling in while the glider is nosing down may seem counter-intuitive but is the corrective action required in this scenario.
BULL FUCKING SHIT. Stuffing the bar in response to a stall is a reflexive action for anybody who has legitimately qualified for a Hang One.
That glider sails shrink with age, and as a result the reflex bridles MUST be checked for proper function. It is not at all unusual to have to shorten these bridles to compensate for sail shrinkage, and also if the glider is being "de-tuned" to soften up the handling.
That's probably what was going on with Ben Dunn's glider:

http://2.bp.blogspot.com/-9Ek9_lFeSII/UZ4KuB0MUSI/AAAAAAAAGyU/eWfhGo4QeqY/s1024/GOPR5278.JPG
http://farm4.staticflickr.com/3725/9665623251_612b921d70_o.png
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http://2.bp.blogspot.com/-Xh_NfnOcUns/UZ4Lm0HvXnI/AAAAAAAAGyk/0PlgrHfc__M/s1024/GOPR5279.JPG

Probably had the sprogs set too low. Have you alerted him to that issue?
As a former instructor...
Do you know Zack Marzec? He too is a former instructor. I'll bet you guys would have lots to talk about.
I recognize the importance of not overwhelming new pilots with excessive information...
Especially the total crap with which they're bombarded in hang gliding.
...but as soon as a pilot is introduced to higher altitudes and steeper climbs under tow they must be given some basic physics instruction regarding tailless aircraft and the effects of an aft CG, especially concerning "unusual attitudes".
This is a fuckin' load of rot.

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


This shit isn't happening because people haven't been trained to and aren't reacting properly. It's happening because they're being issued cheap shit equipment with Rooney Link compensators and being encouraged to "pro tow" when they reach appropriate skill levels.
A pitch attitude exceeding 30 degrees from level is officially considered to be an unusual attitude.
It's OFFICIALLY considered a DANGROUS attitude. And you goddam instructors...

Image

...are having your students doing it routinely at the most dangerous stage of glider flight starting Day One.
A nose-up attitude of 30 degrees is not uncommon with winch or automobile towing systems.
And talking about a thirty degree pitch limit for towing is moronic because the glider's trimming to the resultant of gravity and tow forces. And the deal is that...
Donnell Hewett - 1980/12

Now I've heard the argument that "Weak links always break at the worst possible time, when the glider is climbing hard in a near stall situation," and that "More people have been injured because of a weak link than saved by one."
...that you can't allow total morons to put chintzy loops of fishing line in the system because you don't agree with the ARGUMENT of reality because it doesn't mesh with your total fucking moronic assumptions.
---
2013/11/12 20:34:00 UTC

I got dayhead (Steve Corbin) mixed up with day dreamer (Glenn Zapien) so my response was a bit more caustic than it should've been.
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Tad Eareckson
Posts: 9161
Joined: 2010/11/25 03:48:55 UTC

Re: Weak links

Post by Tad Eareckson »

http://www.hanggliding.org/viewtopic.php?t=30306
Non-fatal crash in Tres Pinos, CA
Steve Corbin - 2013/11/12 02:31:21 UTC

Towing students must be taught that things don't always go as planned, that a rope break, weak link break, or some other human or equipment failure can result in the glider "zooming" into a very high nose-up attitude.

That a steep nose-up angle can and probably will result in a tailslide. That a tailslide will result in a Tuck.

That a Tuck will result in a Tumble unless corrective action in the form of getting as much weight as far forward as possible is taken immediately.
http://4.bp.blogspot.com/-bRrpHNa68iY/UQ6Pv9gRZyI/AAAAAAAAjTg/Hc22bx5122Q/s2048/20943781_BG1.jpg
Image

http://ozreport.com/forum/viewtopic.php?t=31052
Poll on weaklinks
Jim Rooney - 2013/03/05 19:42:58 UTC

My god my head hurts.

Wow...
So you know what happened then?
OMG... thank you for your expert accident analysis. You better fly down to FL and let them know. I'm sure they'll be very thankful to have such a crack expert mind on the case analyzing an accident that you know nothing about. Far better data than the people that were actually there. In short... get fucked.

Again, tell me how all this nonsense is about "safety"?

So, a stronger weaklink allows you to achieve higher AOAs... but you see high AOAs coupled with a loss of power as *the* problem? So you want something that will allow you to achieve even higher AOAs?
Are you NUTS?

I'm tired of arguing with crazy.
As I said many times... there are those that listen with the intent of responding... you unfortunately are one.

You've done a great job of convincing me never to tow you.
Thank you for that.
Mission accomplished.
Steve Davy
Posts: 1338
Joined: 2011/07/18 10:37:38 UTC

Re: Weak links

Post by Steve Davy »

Tad Eareckson wrote:If the Pitch and Lockout Limiter was left engaged and kicked in and it's based on a Linknife - and I'm pretty sure it is - there will be a cleanly cut (weak) link.
It isn't based on a Linknife. It's just a line from the nose directly to the three (or two) string.
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