The exciting bits
Deltaman - 2012/05/28 07:11:14 UTC
Hi,
anything I see in this video:
http://www.youtube.com/watch?v=TaVg_bzK3Aw
is not a cart launching issue but an unexpected AND unjustified weaklink failure.really sorry to refer to the banned monster Tad but :I wrote about Zapata because what happened is very unusual.
http://ozreport.com/forum/viewtopic.php?p=69933#69933
I considered really differently the purpose of a weaklink: it's just a safety device to avoid glider and a good release system overloading, not to protect the (good or bad) pilot as it cannot with certainty and reproducible in any situations and can put you easily in trouble with unexpected failure.
As sailplane we should FIRST consider a release we can actuate at any moment (cart and flight time) with 2 hands on the controlbar (2 points or mouth releases) with few effort at any load encountered.
and use a stronger weaklink.
As a (french) instructor, as a weaklink I used about 1.4G the maximum certified operating weight of the glider, so about 190kg most of the time (220kg on the tug side) with the GetOff 2 points release (JoeStreet release with reliable capacity).
Last 4 days instruction:
No unexpected failure.
Only 1 failure in 90 AT with 12 brand new pilots in the activity when one started to lock out after oscillation and released at the same time than the wl blowed in a no impressive situation.
You shouldn't correlate altitude loss and lockout severity with weak link strength.
You can lock out with few tension (stalled tip in turbulence for example) and die by smashing the ground. Greenspot can nothing for you.
and if you let a lockout continue at altitude (when you normaly should have release), the tension will Increase dramatically and 1.5G wl will break with no much difference.. except maybe for the feeling of the tug but nothing really noticeable and unsafe..
keep you away from unnecessary and costly and unsafe wl failure
- WHAT questions, asshole?Jim Rooney - 2012/05/28 11:49:58 UTC
Guys
Your questions hold the answers.
- WHAT questions to YOU, asshole?
- Antoine just explained weak link theory and told you he was using weak link ratings consistent with what sailplanes have been doing since the beginning of time and reported pulling off ninety safe solo flights with superior equipment on pilots new to aerotowing all save one of which went to altitude without a problem and an odd one aborted with wide safety margins.
http://ozreport.com/forum/viewtopic.php?t=24846
Is this a joke ?
- And here comes fuckin' Missionary Jim to start telling him how to fix problems he doesn't have 'cause he hasn't been listening to any of you total shitheads.Davis Straub - 2011/08/26 14:04:52 UTC
We had six weaklink breaks in a row at Zapata this year.
- So why don't you just shut the fuck up.
Sorry Jim, I missed the part where somebody got done in. Can you elaborate a bit?What you're writing about and what your seeing are two very different things.
Your theories are what are doing you in.
WHO is talking about coming out of the cart too early and not having enough flying speed? One of the thousands of insane voices that only you can hear?What you're talking about is coming out of the cart too early and not having enough flying speed.
Looked a bit more like Mach 6 to me. But hey... You're the ex spurt.What you're watching is Davis coming out of the cart at Mach5.
Yeah. He rolls on the cart an ENTIRE FIVE SECONDS!!! My GOD!!! What was he THINKING?! What's wrong with this guy? Oh yeah...He is absolutely no where near coming out too slow!
http://ozreport.com/forum/viewtopic.php?t=25015
Zippy pounds in
Davis Straub - 2011/09/02 18:37:09 UTC
Concussions are in fact very serious and have life long effects. The last time I was knocked out what in 9th grade football. I have felt the effects of that ever since. It changes your wiring.
- Yeah. TOTALLY different ballgame. It just ASTONISHING that USHGA has failed to recognize this issue and deal with it by creating different AT signoffs...I've said it before, I'll say it a million times... a 582 tug is NOT the same thing as a 914.
Using 582 techniques on a 914 will put you in the shit.
-- AT 582 attainable with a Novice rating.
-- AT 914 for Advanced pilots with five hundred 582 launches no more than half of which may involve a standard aerotow weak link failure under ten feet.
Yeah, I always prefer to come off the cart a little slow. The sight of all that runway screaming by me when I have a little reserve of airspeed always scares the crap out of me.All this "hang onto the cart till it's flying" stuff is fine for 582s. It is NOT for 914s.
Dickhead.In a word... propwash.
Nah Jim, I don't think you really need to clarify that point with all the morons you get listening to you.I'm not kidding.
Let me be the first to say that I've always had the DEEPEST of appreciation for everything you assholes blow our way.It amazes me how people underappreciate the propwash.
If only there were some way people could feel its effects. But they just keep flying through it completely oblivious to the danger it should be presenting.It's an afterthough... a footnote.
And all this time...Let me tell ya guys... on a 914, it's the #1 factor when you leave that damn cart.
You SLAM into that propwash.
http://groups.yahoo.com/group/hhpa/message/11155
Question
...I've been thinking it was the single loop of 130 pound Greenspot. Live and learn.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.
How big are these rocks, Jim? How long before you hafta replace a downtube because it gets too banged up to fly safely?I'm towing out here in the desert at the moment. Out here, like it or not, you get to see the propwash. You see it in a big way. Even when we're towing on the pavement, you get to see it. It sucks and you know exactly where it is... because it's a big old cloud of dust and rocks.
- Aw, c'mon Jim. PLEASE tell us how we can use crosswinds and fly around propwash to make our tow launches safer. Think of all the lives you could save.We insist on our passengers wearing glasses because of it (we provide them if they don't have their own).
Crosswinds of course make a huge difference. But again, we see the propwash... it's clear as day. Sometimes we can even steer around it (that's an other topic though).
- Which means that sometimes you CAN'T steer around it. So where are all the fatality reports stemming from gliders that have been flipped upside down by hitting propwash right after they get airborne?
But whenever you get hit by the deadly blast you immediately sing praises to God when the glider shudders violently and you realize what would've happened had you not been locked onto the dolly.The reason I make such a big deal about the difference between the 582s and the 914s is because behind a 582, you're still on the ground when you hit the propwash. You're rolling on the cart and you roll right on through it. No big deal.
Fuck you and your goddam Mach 5. You're going the same speed the tug is and that's gonna be pretty much the same for the duration of the tow. But you're gonna keep saying Mach 5 till hell freezes over anyway 'cause it makes you feel like Chuck Fuckin' Yeager.So when you "wait till you're lifting the cart"... you're WELL BEYOND the propwash.
When you exit at Mach5, it's no big deal.
No. I stopped wondering why I was breaking weak links when I finally figured out that I was dealing with a long line of total fucking morons which started with Donnell and ran through Bobby, Quest, Currituck, and Ridgely.Now, when you do this behind a 914... it's a huge deal.
As I said, you slam into the prop wash.
And you're wondering why you're breaking weaklinks????
Fuck you.Are you kidding me?
What the hell could some brain dead little shit like you possibly know about THINKING? The only reason you're in this sport is 'cause it's the only branch of aviation so fucking stupid that some moron like you with an IQ in the extremely low double digits can blather anything he feels like and be hailed as a genius.Think about it...
Yeah, to override your decision to go hang gliding....you're going a million miles an hour under huge (relatively speaking) line tension as you come blazing out of the cart struggling to "stay down"... as you slam into turbulent air. Hell yes you're going to break weaklinks. That's what they're there for!
Yeah, that's what we saw Davis doing. Holding the cart for grim death behind a 914, coming off at a million miles an hour under huge (relatively speaking) line tension as he came blazing out of the cart struggling to stay down as he slammed into turbulent air and subjected his weak link to massive loadings.You're subjecting them to massive loadings.
(The shock loading a weaklink sees as you hit the propwash is far greater than people appreciate)
That's why we have them... they're doing their job.
The solution to your problems is first and foremost to realize that a 582 is NOT a 914.
Holding the cart for grim death behind a 914 will make your life considerably harder, not easier.
Antoine...
- 1.4 times the maximum certified operating weight of the glider
- About 190 kilograms
- 220 kilograms
- 1.5 G weak link
- purpose of a weak link: to avoid glider and a good release system overloading
Rooney...
- Mach5
- slam into the prop wash
- weak links (industry standard)
- a million miles an hour
- massive loadings
- shock loading
- far greater than people appreciate
- purpose of a weak link: to dump you on the runway when you slam into turbulent air
No fuckin' clue as to speeds, forces, tensions strengths, theory. Just pulls stuff out of his ass and gets the cult members to eat it out of his hand.
---
Banned monster Tad:
http://ozreport.com/forum/viewtopic.php?p=69933#69933
http://ozreport.com/forum/viewtopic.php?t=15716
weak links
Tad Eareckson - 2009/04/27 13:45:22 UTC