Releases

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

Post by Tad Eareckson »

http://www.hanggliding.org/viewtopic.php?t=29818
Hang glider tow gone bad.
Mel Torres - 2013/08/28 18:03:26 UTC
Long Beach

http://www.youtube.com/watch?v=nRPII_V5n0g


This guy is lucky to be alive.
Came out a lot better than this guy:

http://farm9.staticflickr.com/8394/8696380718_787dbc0005_o.png
Image
Image
http://4.bp.blogspot.com/-bRrpHNa68iY/UQ6Pv9gRZyI/AAAAAAAAjTg/Hc22bx5122Q/s2048/20943781_BG1.jpg

didn't he?
Alan Deikman - 2013/08/28 18:10:54 UTC
Fremont

From Russia with love.

It looks to me like the pilot didn't want to go.
Bullshit.

- If he didn't wanna go he had the ability not to. I know that's a difficult concept for a Hewett approach tower to grasp but there are other - and vastly superior - ways of playing this game.

- He's resisting the pull from the winch while the tension builds - as he should.
By the third step he's leaning way back and the AoA on the glider is nose up at least 15 degrees.
He doesn't have the glider anywhere near properly set - but that's an entirely separate issue.
No way to recover from there except pure luck.
A bit like this one:

Image

isn't it?
The wages of poor pitch control.
How much pitch control does someone have when he's taking his hand off the basetube to attempt to pry his very very reliable shoulder mounted bent bin barrel release open?

Image
The onlookers amazingly unconcerned about it all.
You can tell that how?
- You can't see them when the shit starts happening.
- The glider has:
-- everyone's undivided attention when it's recovering and they come back into view
- a soft landing/crash with very likely not so much as a bent downtube or skinned knee
- Nevertheless the two people closest immediately start running towards it.
- It's a 360 resolution video and all bodies and faces are turned towards the glider and away from the camera.
Dan Lukaszewicz (Lucky_Chevy) - 2013/08/28 20:43:38 UTC
Alexandria, Virginia

That is 100% an instructor issue.
- That's my take on damn near every hang glider incident - and you're more than welcome to try to cite some exceptions.

- What's your take on this one:

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


Mark Knight was the instructor who taught him everything he needed to know about towing and Mel Glantz was the instructor who pulled him.
When the angle of attack was increased outside the normal range the operator should have cut power...
Wills Wing / Blue Sky / Steve Wendt / Ryan Voight Productions - 2007/03

NEVER CUT THE POWER...

Image

Reduce Gradually
Increase Gradually
...and let the trainee run or belly flop.
The glider was started off with its nose up and keel and left wingtip on the ground. It should never have been pulled up in the first place - the lockout was one hundred percent inevitable.
Instead is sounds like he applies full power and rips the trainee off the ground in a high angle climb that pops the weak link.
Did you bother to read...
fantomasilia

There wasn't weak link. We use tooth-lock.
...the comments?

- Not using ANY weak link is stupid but, on a winch tow, only about 0.001 percent as stupid as using a Blue Sky 130 pound Greenspot pitch and lockout protector.

- The fact that they were using a "tooth-lock" which allows the PILOT to stay on or get off tow at HIS DISCRETION without compromise of control blows the fuck out of just about anything the West (including Australia) has to offer.
Scooter tow training is a dance between the student and the instructor with the throttle being constantly modulated in response to the students actions.
Put an apostrophe in "student's" and you've done a pretty good job of blowing assholes like Rooney, Davis, Trisa outta the water.
Better to let the student slide on his knees from too little power than to hurt them by giving them too much altitude/energy.
- This was NOT a Day 1 sorta student.
- Better to make sure the fuckin' glider's ready to go and give it the power for an easy crisp launch.
- Better yet to use a goddam dolly - this situation would've been damn near impossible to achieve had that been the case.
I learned to fly by scooter towing...
Yeah...
Dan Lukaszewicz - 88871 - H3 - 2012/08/23 - Steve Wendt - AT FL PL ST 360 CL FSL
We know.
...and have probably watched fifty classes over the years.
In how many of those did the glider have a confident and reality based expectation of being able to safely remain on and abort the tow at his discretion?
I've never seen something so outrageous. Image
Great! I'll put you down as being totally cool with what happened before/during/after...
- Mike Haas
- Robin Strid
- Holly Korzilius
- Jeremiah Thompson
- Bill Priday
- Bille Floyd
- Kunio Yoshimura
- Steve Elliot
- Roy Messing
- Martin Apopot
- Lenami Godinez-Avila
- Terry Mason
- Shane Smith
- Robert Buxton
- Zack Marzec
- Ben Dunn
- Lin Lyons
gluesniffer - 2013/08/29 01:32:26 UTC

Comrade oogle oogle just needed more keel assistance. I don't launch unless someone is holding my keel and setting my aoa. :shock:
Name somebody who does a better job of that than a launch dolly.
I say more throttle too Image that red got lucky....
That wasn't all luck, motherfucker. He had the equipment and ability to abort the tow in an emergency and that makes him and that operation head and shoulders over THIS:

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

total asshole - and the other total assholes involved in that operation. Assume everything's gonna go just fine and if/when it doesn't wait for your fishing line to pop and brace for impact.
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Tad Eareckson
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Re: Releases

Post by Tad Eareckson »

Just did some (more) editing on the previous.

I had mistakenly written in Matt Christensen (lostgriz) for Lucky_Chevy. Steve caught the error in pretty short order and I made the substitution. I failed, however, to note that there was another mistake tied to the first further down in the post.

That's now fixed as well but - as luck would have it - it didn't matter much. These two guys are cloned Blue Sky products:
Dan Lukaszewicz (Lucky_Chevy) - Alexandria, Virginia - 88871 - H3 - 2012/08/23 - Steve Wendt - AT FL PL ST 360 CL FSL
Matt Christensen (lostgriz) - Vienna, Virginia - 90918 - H3 - 2012/04/01 - Steve Wendt - AT FL PL ST
Lucky Dan didn't go to any great lengths to conceal his true identity but I wasn't able to figure it out until now and I'm happy to have that one off my to do list.
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Tad Eareckson
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Re: Releases

Post by Tad Eareckson »

http://www.hanggliding.org/viewtopic.php?t=29818
Hang glider tow gone bad.
Casey Cox - 2013/08/29 01:54:57 UTC

I've sure have learned something. No one has ever told me to kick my legs like in a free style stroke to level a turn out.
And I've learned from the highly qualified professionals...

http://www.youtube.com/watch?v=r1LbRj-NN9U
Mitch teaches weak link break strategy
Mitch Shipley - 2011/03/20

If you take this away that angle goes from there to now there and the... You're stalled. You're stalled.
...who take your five year old kid up for joyrides...

http://www.youtube.com/watch?v=3h1uyn_zTlo

Image
http://c2.staticflickr.com/6/5517/14036301121_17849a6a04_o.png
7-14522

...that a piece of fishing line which blows at random when the glider's straight and level and is virtually guaranteed to blow...
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."
http://www.paraglidingforum.com/viewtopic.php?t=2859
Towing safety
Daniel Walker - 2005/06/26 05:04:18 UTC

My issue with weak-links is that they typically fail at the worst possible moment. I don't tow with a lot of pressure down low, but on tow you are anchored to a system with some inertia (not the same as free flying). It is not that hard to be pitched up relatively steeply by a sharp gust.
...at the worst possible time, when the glider is climbing hard in a near stall situation...

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.
...increases the safety of the towing operation - PERIOD.

But I don't hear a whole lot of you smug smartass motherfuckers making a lot of cracks about that.

0:50
http://www.youtube.com/watch?v=JR_4jKLqrus
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Tad Eareckson
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Re: Releases

Post by Tad Eareckson »

http://www.hanggliding.org/viewtopic.php?t=29818
Hang glider tow gone bad.
Steve Seibel - 2013/08/29 04:42:20 UTC

Angle of attack, schmangle of attack. It's all a plot to make you buy books and take lessons. This guy made a beautiful circle in the sky without worrying about any of that stuff...

The artistic running-in-mid-air at the high point of his trajectory was a very nice added touch. You won't find anything about that in Pagen's books etc...
Ya know sumpin, Steve...

http://www.hanggliding.org/viewtopic.php?t=28290
Report about fatal accident at Quest Air Hang Gliding
Steve Seibel - 2013/02/12 19:17:30 UTC

weak link thoughts

Well, I wasn't going to post anything speculative, tangentially relevant, or theoretical on this sad thread. But, we've already gone there. So I guess I will.

A few thoughts re weak link strength--

The theory that we should be using much stronger weak links, seems to come from FAA recommendations for sailplanes. In sailplanes, the geometry is such that the tow force really doesn't create significant control problems. The weak link really and truly is there ONLY to protect the airframes from overload.

In hang gliding, the nature of the beast is such that getting out of position can create rapidly-accelerating control problems. Lockout, etc. Now, I know full well that a weak link won't stop a lockout until you are deep into it. It won't save you from hitting the ground if the lockout happens at very low altitude. Still, I'd rather break loose a little sooner than just before my airframe fails. For example, in a really wild lockout with a really strong weak link, might you not roll all the way beyond 90-degrees to semi-inverted? I think you might, especially with a kingpost-mounted hang point which is inherently destabilizing.

I experienced one severe lockout where the G-forces (lift forces) built so rapidly that they interfered somewhat with my ability to reach for the release with my arm. It was a bicycle-style release handle mounted low on the right down tube. I never want to subject my airframe and sail to any more force than that! I don't loop, but it was way more force that I would ever put on the glider in a steep turn or wingover. So, I guess that means that I don't want to tow with a stronger weak link.

In this instance, I did press the release, but later examination found the weak link to be broken. It must have broken just the instant before I pressed the handle far enough to release. Since I'm saying I don't want to ever load the glider more than that, I guess that means it broke at just the right time.

I was towing with a weak link of 130-pound-test greenspot cord tied in a loop in the usual manner, with the usual double v-bridle arrangement (not "pro tow"). The weak leak that broke was the one that connected the upper end of the upper V to the spinaker release on the keel, as expected.
Nobody stupid enough to:
- read the crap Dennis puts in his books and not go ballistic
- go up on a Wallaby release and Rooney Link
has any goddam business criticizing or critiquing anybody about anything.

The guys in that operation are fixable. No way in hell you are - or ever will be.

P.S.
2013/02/12 21:07:10 UTC - 3 thumbs up - Paul Walsh
And if getting accolades from this total moron doesn't tell you something then nuthin' will.
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Tad Eareckson
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Re: Releases

Post by Tad Eareckson »

http://www.hanggliding.org/viewtopic.php?t=29818
Hang glider tow gone bad.
Nick Bollinger - 2013/08/29 16:29:49 UTC
Cincinnati, Ohio

Is it too hard to invest in or build a cart for aerotowing takeoffs?

I'd figure there would be less error there as the wing gets up to the speed in the cart instead of the pilot supporting the weight of the wing and control it while you're being pulled to speed.
What an absurd idea. Cart's greatly increase the complexity of the towing operation and increased equipment complexity just increases the probability of catastrophic failure.
Tom McColly - 2013/08/29 18:08:20 UTC

maybe need a lesson or two first from a qualified instructor
Sure. Name one. Then maybe we'll have someone capable of telling us what went wrong with the Zack Marzec tow.
Steve Davy
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Re: Releases

Post by Steve Davy »

I have this photo saved on my computer thinking it was a nice shot of the vice versa bend, but just noticed that it is a bit different.

Image

Notice the turns are rotated 180 compared to the vice versa.

Better photo here:

http://www.enm.bris.ac.uk/staff/RRClements/knots/sbfig6.jpg
---
Edit - 2014/10/19 13:00:00 UTC - Tad Eareckson

That one went dead. So...

http://www.flickr.com/photos/108332933@N05/11124226893/
Image
Last edited by Steve Davy on 2013/11/29 23:42:03 UTC, edited 1 time in total.
Steve Davy
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Re: Releases

Post by Steve Davy »

I copied the mystery bend and found that it will collapse with little effort.

http://lh4.googleusercontent.com/-oIj6nVJwwJQ/UiYoaNUnteI/AAAAAAAAAEI/9G3wJGhOfBw/w503-h377-no/DSC00098.JPG
Image
Steve Davy
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Re: Releases

Post by Steve Davy »

Found it. It's a Sennit bend:

http://www.southee.com/Knots/Knots_Bends.htm

Edit: An Alternative Technique for Tying the Sennit Knot
by Dick Clements:

http://www.enm.bris.ac.uk/staff/rrc/knots/SennitKnot.pdf
Steve Davy
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Re: Releases

Post by Steve Davy »

The 'Irish Bowline' and the Triangular Bend
by Dick Clements:
http://www.enm.bris.ac.uk/staff/rrc/knots/IrishBowline.pdf

Something I didn't know about the sheet bend:
http://www.animatedknots.com/sheetbend/index.php?LogoImage=LogoGrog.jpg&Website=www.animatedknots.com
Structure: When correctly tied the two tails lie on the same side of the knot. The alternative version - with the tails on opposite sides - is less reliable.
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