Releases

General discussion about the sport of hang gliding
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Tad Eareckson
Posts: 9149
Joined: 2010/11/25 03:48:55 UTC

Re: Releases

Post by Tad Eareckson »

http://www.hanggliding.org/viewtopic.php?t=31045
Truck towing. Second try with new rig.
Jim Gaar - 2014/04/08 04:56:38 UTC

That's what made me cringe.
Wow. Must be REALLY scary if it makes YOU cringe. I remember when Zack Marzec got splattered on the Quest runway because of his pro toad bridle and Rooney Link and you didn't bat an eye.
I would never let the launch decision be anyone's
but the pilots.
- Yeah, just like on an aircraft carrier or a Cape Canaveral launch pad. It's gotta be the PILOT who pushes the actual button.
- Learn to write a sentence at grade school level or better.
Too much liability.
I don't think so. You can sell defective aerotow releases all over the planet...

http://www.hanggliding.org/viewtopic.php?t=22540
LMFP release dysfunction
Jim Gaar - 2011/07/14 15:40:13 UTC

In a litigious society like the U.S. it's all part of the game. If you don't like it, you just take your ball and go home...

This is the reality of the sport we love. "Always the student". Learn how to use it or don't. You just missed out on what every American pilot already knows from birth.

We assume risk every day. Sometimes with a LMFP release. Hope you get your issues ironed out. The classified section is ready if you don't.
...and nobody seems to give a flying fuck whenever somebody...

http://forum.hanggliding.org/download/file.php?id=11565
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...dies on one of them.
Plus if the release guy F's up he has to live with that forever.
- But that only counts when you release somebody off the platform - not...
Towing Aloft - 1998/01

Pro Tip: Always thank the tug pilot for intentionally releasing you, even if you feel you could have ridden it out. He should be given a vote of confidence that he made a good decision in the interest of your safety.
http://www.chgpa.org/forums/viewtopic.php?f=2&t=2467
weak links
Jim Rooney - 2007/08/01 13:47:23 UTC

Whatever's going on back there, I can fix it by giving you the rope.
Bill Bryden - 1999/06

Rob Richardson, a dedicated instructor, died in an aerotowing accident at his flight park in Arizona. He was conducting an instructional tandem aerotow flight and was in the process of launching from a ground launch vehicle when the accident occurred.

Rob had started to launch once but a premature towline release terminated this effort after only a few meters into the launch roll-out. It is suspected the cart was rolled backwards a bit and the towline was reattached to begin the launch process again. During the tug's roll-out for the second launch attempt, the tug pilot observed the glider clear the runway dust and then begin a left bank with no immediate correction. At that point he noticed that the launch cart was hanging below the glider and immediately released his end of the 240 ft. towline. The tug never left the ground and tug pilot watched the glider continue a hard bank to the left achieving an altitude of approximately 25 feet. Impact was on the left wing and then the nose of the glider. Rob was killed immediately from severe neck and head trauma.
http://ozreport.com/forum/viewtopic.php?t=2266
Nuno Fontes - Hang Gliding Towing Accident.
Nuno Fontes - 2006/05/27

We were towing on the lee side of some thousand foot mountains. I had flown without problems an hour before.

I got to about a hundred feet and the glider was completely veered to the left due to the strong crosswinds from the right.

What made me hesitate and not release was having the right wing way up and being stalled and very low. I had the feeling I was going to be catapulted backwards if I released and had a clear notion I was going to hit dirt in a tailwind.

The best option seemed to be to resist the lock out and slowly bring the glider down, even if it was crooked, but another problem arose when the observer had the tow line cut when I was down to about fifty feet.

I had no chance. The glider that had been hanging on like a kite dead leafed to the ground. The left leading edge hit first, destroying it along with the nose plates. My body's impact point was the left shoulder and the left side of my head and neck.

I remained unconscious for about twenty minutes with a bloody face from what poured from my nose. The chopper arrived about an hour after the crash. I was already semi-conscious but in a lot of pain and having trouble breathing. I was hauled to Stanford (about half an hour flight time).

The toll: fracture and crushing of the upper humerus, several broken ribs, a lung pierced and collapsed by one of them, and broken C1 vertebra right by the artery. They considered surgery, but the no-surgery risk was lower - they feared a chip would rupture the artery.
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http://www.ushawks.org/forum/viewtopic.php?f=17&t=1081
Platform towing /risk mitigation / accident
Sam Kellner - 2012/07/03 02:25:58 UTC

No, you don't get an accident report.
...off the tow.
Manned Kiting
The Basic Handbook of Tow Launched Hang Gliding
Daniel F. Poynter
1974

"A bad flyer won't hurt a pin man but a bad pin man can kill a flyer." - Bill Bennett
"The greatest dangers are a rope break or a premature release." - Richard Johnson
- If the nose release guy pulled the string on the pilot's command he didn't fuck up - regardless of what happened next.
I would not wish that on anyone.
Yeah, whenever someone on or involved with the pulling end of the towline kills someone in this sport they undergo SUCH TRAUMA. Just listen to Lauren here:

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

I am posting the report my husband, Paul Tjaden, just wrote about Zach Marzec's death at Quest. It is a great tragedy to lose someone so young and vital. We are sick about it, and our hearts go out to his friends, family and loved ones.
My heart SO goes out to her.

http://ozreport.com/forum/viewtopic.php?t=24534
It's a wrap
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.

I rarely break weak links -- in fact, I believe the last one was some two years ago, and I have never broken one on a tandem (probably because I am light and also because I change them whenever they show any signs of wear). They are a good thing to have, though!!
I can't imagine the suffering she's experiencing.

- So you're saying that once the glider comes off the truck it's "pilot" has no means of aborting the tow in an emergency?
-- Yeah. Big surprise.
-- Tough shit. The "pilot" knew that and elected to take the risk and not pursue technology to make the launch safe.

- Lemme tell ya sumpin', douchebag...

-- The guy who pops the nose release on a truck tow on the pilot's command isn't any more responsible for what happens to the glider afterwards than the wire crew on a ramp launch which clears upon the pilot's command.

-- Furthermore popping the nose release doesn't commit the glider to launching. If the guy doesn't wanna commit aviation all he's gotta do is hold the bar back. He can MORE safely abort than he can in a lot of windy ramp situations and light air running slope launches.

Asshole.
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Tad Eareckson
Posts: 9149
Joined: 2010/11/25 03:48:55 UTC

Re: Releases

Post by Tad Eareckson »

http://www.hanggliding.org/viewtopic.php?t=31045
Truck towing. Second try with new rig.
Garrett Speeter - 2014/04/08 15:14:07 UTC

Interesting points all.
Yeah Garrett, whenever you're having a discussion on an intellectually castrated hang gliding forum you're gonna get lotsa interesting points.
On the self launch thing, I actually was going to do that at first but Havent figured out a way to do it that I like.
There is NOTHING wrong with what you're doing now on that.
We simply yell clear when we want the launch safety guy to pin us off.
Yeah. Sounds a lot like an assisted windy cliff launch to me - 'cept fifty times safer.
It has been working but I may change it.
Yeah, whenever you're doing something that's working well in hang gliding you should prioritize fixing it.
I like launching with both hands on the control bar.
How do you feel about releasing in a lockout with both hands on the control bar?

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Tell me some things you like to do in this sport with ONE hand on the control bar. I mean BESIDES releasing in a lockout. Nobody's really had much of a problem with that since Donnell Hewett started publishing 33 years ago this month and explained to us how that really wasn't an issue.
Jorge Cano - 2014/04/08 15:56:55 UTC
Spokane

I love truck towing and glad to see new operations, some suggestions
I agree pilot should be 100% in command.
Bull fucking shit.

- You believe the "pilot" should be a dope on a rope - praying that nothing will go seriously wrong on any launch. Otherwise you'd be configuring so that he can keep both hands on the basetube at all times no matter what happens or what he will need to do.

- It's fuckin' lunacy to think that the "pilot" in a tow operation can be one hundred percent in command. He's ALWAYS got somebody else controlling his thrust. And sometimes that motherfucker's gonna be - for all intents and purposes - one hundred percent in command.

- What are you using for a weak link and what's its purpose?

If the "pilots" - even with top notch equipment on their end comparable to what we've been able to do in aerotowing - can be one hundred percent in control then you're perfectly cool with putting whatever twats happen to be available on the front end controlling speed and tension and monitoring the glider, right? They don't need anything in the way of training, skills, experience, judgment and you can still have perfectly safe operations, right?

That certainly must be the case 'cause it's been decades since I've heard of a front end guy bearing any measure of responsibility for a towing disaster.
Garrett Speeter - 2014/04/08 16:02:18 UTC

Thanks Jorge!
I will look into that.
More suggestions are always welcome! I am new at this.
I have a suggestion. Put some measure of the effort and expense you've put into the front end stuff into a safe glider release and make the sport a lot better than you found it. But you won't do that because all you're interested in is getting dialed in to whatever everyone else is doing.
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Tad Eareckson
Posts: 9149
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Re: Releases

Post by Tad Eareckson »

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Couple days ago I was going through the video of the 2012/10/03 Bob Buxton bridle-over-the-basetube truck tow disaster:

Bob Buxton accident
http://www.youtube.com/watch?v=_2oeb0nNIKs
Scott Buxton - 2013/02/10
dead

to extract some stills and picked up on something I'd managed to miss previously. In the last second before the crash the towline starts snagging on (what I'll call) the sagebrush along the right side of the runway. Catches on the first clump high and pulls through, catches the second clump lower and REALLY bends it over before disengaging, then anchors on the third.
---
2022/04/08 06:00:99 UTC

My "sagebrush" is Creosote Bush - Larrea tridentata.
---
This action is, of course, increasing the tension going to the glider and redirecting the pull towards aft. Just what he really needed.

I captured and uploaded every frame of the critical period. A bit much, perhaps, but, what the hell, it's a record of someone getting his life destroyed because of a simple, fairly easily made mistake, an untrained crew asleep at the switch, a weak link that didn't break when it was supposed to, and a willingness to fly minus the couple hundred bucks worth of the release equipment that would've still reduced the consequences to nothing more than embarrassment.

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---
Edit - 2015/03/18 12:30:00 UTC

Lately been reworking a lot of my older stills collections - mostly for the purpose of replacing the PNG uploads with max compressed files (fraction of the strorage requirement, no degredation of image quality). In the course of doing this one I found a minor issue with the cropping (now 964x716, was 962x718) and upped the frame count from 47 to 86. Good thing too, as I just found:

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So much for:

http://www.hanggliding.org/viewtopic.php?t=28305
Bob Buxton Truck Tow Accident Video
Scott Buxton - 2013/02/10 10:17:16 UTC

I am posting this for my Dad, Bob Buxton. My Dad wants to make the video of his truck towing accident on 2012/10/03 public so that others may learn from his mistake.
Got a copy if anyone wants it.
---
Edit - 2016/10/20 21:00:00 UTC

Added seven frames to the original sequence from the camera on the truck and a 26 frame sequence from a handheld camera back at launch.

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Tad Eareckson
Posts: 9149
Joined: 2010/11/25 03:48:55 UTC

Re: Releases

Post by Tad Eareckson »

http://ozreport.com/forum/viewtopic.php?t=31052
Poll on weaklinks
Jim Rooney - 2013/03/10 22:58:21 UTC

I'm not bothered by straight pin releases.
I do think the strong link guys gravitate to them due to the higher release tensions that strong links can encounter.
Jim Rooney - 2013/03/12 15:43:02 UTC

As I said before, the guys seeking these straight pins are doing so because they want stronger weaklinks.
So they're better releases, right? They can withstand higher loads and require only thirty percent of the pull to blow the same tension.

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

The barrel release wouldn't work because we had too much pressure on it.
So aren't ALL tandem drivers strong link guys? So why do they ALL insist on using Bobby Bailey crap in their systems?
Dr. Trisa Tilletti - 2012/06

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.
Fuck you, Trisa.
User avatar
Tad Eareckson
Posts: 9149
Joined: 2010/11/25 03:48:55 UTC

Re: Releases

Post by Tad Eareckson »

http://www.chgpa.org/forums/viewtopic.php?f=2&t=3035
Tad's Barrel Release and maybe an alternative
Jim Rooney - 2008/02/13 09:06:35 UTC

Oh..... in failing to answer my "what advantage does a straight pin have" question... you attempt to reverse it to "what advantage does a curved pin have".

Well, two things....
One... no one's trying to improve on your design. The bar was set with the Bailey... it is to YOU to "improve", which you have not done.

Two... The advantage of a curved pin... it can handle differing thicknesses of materials. Yours can't. You have a very narrow range and then you run into the problem of that pesky stop. That's why yours have weaklinks on both ends... nice and thin.

Call it insignificant if you will, but YOU are the one that is the incumbent... the onus is on you, not Bobby.
Tad Eareckson - 2008/02/24 19:31:25 UTC

With respect to your assertion that my straight pin barrels can't handle differing material thicknesses...

I closed my personal copy over a loop of 3/8 inch Yale Crystalyne (11500 pounds) and it worked fine. Exactly what are you trying to tow with yours?

And, no, I don't have weak links on both ends - I don't use weak links as you define them. But, in any case, what's your point? Why wouldn't anyone who had done the walnut thing want the redundancy and why would anyone want to increase the material diameter and thus the side loading on either a curved or straight pin release?
http://www.hanggliding.org/viewtopic.php?t=17404
Aerotow barrel release - straight or curved pin?
Holger Selover-Stephan - 2010/05/28 22:16:33 UTC
Portland, Oregon

I ordered and received a few barrel releases from Blue Sky. They have straight pins, not the curved ones I'm used to. Steve at Blue Sky tells me this:
...they [the curved pins] don't release with as little tension on them as the straight pins. Otherwise, there is no difference. It makes it hard to put just a rope on the barrel end, which encourages a weak link. Just a good idea. That's why we've been shifting that way, as are many other manufacturers of these releases.
Anybody got an opinion on this matter? Thanks!
http://ozreport.com/forum/viewtopic.php?t=24846
Is this a joke ?
Jim Rooney - 2011/08/26 17:34:33 UTC

Try fitting a straight pin release with anything but weaklink. (it doesn't quite fit the same) OH! Right. Just might be that we've thought of that eh?
Zack C - 2011/08/31 02:45:17 UTC

Why would you want to? Shouldn't releases be protected by weak links anyway?
http://ozreport.com/forum/viewtopic.php?t=31052
Poll on weaklinks
Jim Rooney - 2013/03/11 18:59:06 UTC

Why aren't straight pins used?
That's easy. They can't be used with anything but thin lines.
They also can't be made with anything but thin lines.
Zack C - 2013/03/11 20:54:09 UTC

Narrower barrels improve release performance. Obviously, you won't be able to use thick webbing inside of them, but why does this matter?

Yes, they have to engage thinner lines, but all releases should engage weak links anyway. (For those with a weak link only on the shoulder opposite the release, imagine what would happen if that weak link broke and the bridle failed to clear the tow ring.)
http://westcoastbrit.blogspot.com/2013/05/a-couple-of-weeks-ago-i-had-experience.html
earth turns and wind burns: Lock out on tow

Image
Towing Aloft - 1998/01

Weak links very clearly will provide protection from excessive angles of attack, high bank turns and the like for this form of towing.
http://2.bp.blogspot.com/-9Ek9_lFeSII/UZ4KuB0MUSI/AAAAAAAAGyU/eWfhGo4QeqY/s1024/GOPR5278.JPG
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User avatar
Tad Eareckson
Posts: 9149
Joined: 2010/11/25 03:48:55 UTC

Re: Releases

Post by Tad Eareckson »

Just a compilation of the stills from the Ben Dunn lockout at Luling in early May of last year...

http://westcoastbrit.blogspot.com/2013/05/a-couple-of-weeks-ago-i-had-experience.html
earth turns and wind burns: Lock out on tow

...at max available resolution.

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From this:

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These:

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Steve Davy
Posts: 1338
Joined: 2011/07/18 10:37:38 UTC

Re: Releases

Post by Steve Davy »

http://www.kitestrings.org/topic54.html
Skyting demolition
Mike Lake - 2012/08/10 12:39:56 UTC

Of those who do tow nearly all will simply use whatever equipment/methods available to them as instructed by their expert.
With a few exceptions the expert will have inherited whatever their expert mentors taught them.
http://www.willswing.com/pdf/manuals/Scooter_Tow_March_2007.pdf
Scooter Tow Manual
An aero-tow type V-bridle and release system works well for scooter towing. This system uses a short V-bridle attached to the harness, with a barrel type release at the right side attachment point. This bridle is passed through a loop at the lower end of a longer V-bridle, which passes through the ring or carabiner on the tow rope, and is then attached, via a weak link, to the top release mounted on the keel of the glider.
Also, no student who has not clearly demonstrated the ability to release properly and reliably, using both the standard and the back up releases, should be allowed to attain an altitude or position from which he could overfly the return pulley.
Steve Davy
Posts: 1338
Joined: 2011/07/18 10:37:38 UTC

Re: Releases

Post by Steve Davy »

3-ring release system:
http://en.wikipedia.org/wiki/3-ring_release_system

The 3 Ring: What It Is, And How It Works:
http://www.dropzone.com/gear/articles/The3RingWhatItIsAndHowIt.shtml

Re-designing the three-ring release system:
http://www.flyaerodyne.com/download/miniforce.pdf

Influencers and Innovation - Three Ring Parachute Release:
http://vimeo.com/76606928
User avatar
Tad Eareckson
Posts: 9149
Joined: 2010/11/25 03:48:55 UTC

Re: Releases

Post by Tad Eareckson »

Jump to next post:
http://www.kitestrings.org/post6025.html#p6025

http://www.hanggliding.org/viewtopic.php?t=31205
Trying to contact Joe Street
Billyjoe - 2014/05/06 01:18:35 UTC
Chicago

Joe designed and made the "GetOff" aero-tow release. I want to buy another one from him but his website won't forward my request. Anyone know how I can get in touch with him?
GAWD!

http://www.hanggliding.org/viewtopic.php?t=21377
AT several Questions
Davis Straub - 2011/04/05 14:00:25 UTC

The flight park procedures here at Quest Air are the result of years of evolutionary pressures and experience that provide the focus on safety.
ImageImageImageImage

http://ozreport.com/forum/viewtopic.php?t=24534
It's a wrap
Paul Tjaden - 2011/07/30 15:33:54 UTC

Quest Air has been involved in perfecting aerotowing for nearly twenty years.
http://4.bp.blogspot.com/-bRrpHNa68iY/UQ6Pv9gRZyI/AAAAAAAAjTg/Hc22bx5122Q/s2048/20943781_BG1.jpg
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Why on EARTH would you WANT TO? Why would you want to fly anything like THIS:

http://vimeo.com/38334812

password - red
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with virtually NO TRACK RECORD when you could have something like THIS:

http://www.youtube.com/watch?v=sgJAUrq-nTs

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http://www.youtube.com/watch?v=YmpUWxWWs3A

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with a fuckin' *HUGE* track record?
michael170 - 2014/05/06 02:40:27 UTC

Hello Billyjoe,
Check your private messages.
Yeah Michael... Did you tell him...

http://ozreport.com/forum/viewtopic.php?t=22308
Better mouse trap(release)?
Jim Rooney - 2010/12/16 18:47:05 UTC

Oh, I've heard the "everything we do is an experiment" line before.
The trouble is, it's not.

I've seen experimentation with towing gear more than anything else in HG.
I've not seen many go out and try to build their own sails for example. When someone does, they're very quickly "shown the light" by the community. Example... the guy that was building the PVC glider in California somewhere.
But for some reason, towing gear is exempt from this.

The difference is what we do has been done by thousands of people already. It's been tested... a lot.
What we do is free of the experimentation part.
It's still dangerous, but not at the level of building new gear is. Not even close.

That's what people fail to realize.
It's no small difference. It's a huge chasm.

Notice how I'm not saying to not do it.
Go forth and experiment. That's great... that's how we improve things.
I'm just warning you of that chasm.

A few years ago, I started refusing to tow people with home made gear.
I like the idea of improving gear, but the lack of appreciation for the world they were stepping into didn't sit with me.
For example... flying with the new gear in mid day conditions?
Are you kidding me????

Approach it for what it is... completely untested and very experimental gear which will likely fail in new and unforseen ways as it tries it's damndest to kill you... and then we can talk.
...that Joe makes these AT HOME and that they're thus uncertifiable?

Aerotow launch faliure
http://www.youtube.com/watch?v=bj-qBsETXPg
Oliver Chitty - 2014/03/02
dead
24 fps
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Asshole.

http://www.getoffrelease.com
Hang gliding aerotow release

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Tad Eareckson
Posts: 9149
Joined: 2010/11/25 03:48:55 UTC

Re: Releases

Post by Tad Eareckson »

Jump to next post:
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http://www.kitestrings.org/post6024.html#p6024
Videos
Steve Davy - 2014/05/23 05:16:31 UTC

Have a good look at the "release" this idiot is using.

http://www.youtube.com/watch?v=I4Ha5Q0OAd4
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- 01 - chronological order
- -0 - minutes
- 24 - seconds
- 04 - frame (30 fps)

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Core mechanism - Wichard 2773 large bail spinnaker shackle. Maybe the next size up - 2774. Drilled à la Quest to rotate the load from the pivot point...

http://www.flickr.com/photos/aerotowrelease/8305428629/
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...to the gate so the precious focal point of their safe towing system doesn't get made excessively safe by sharp edges of the pivot rivet they're too stupid to smooth out with a few strokes of a fine file. Never miss an opportunity to make something heavier, draggier, weaker, less efficient, harder to use, more dangerous whenever it rears its ugly head.

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OK Cragin, you've gotten the wave-off...

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...and have turned your head so you can see where you velcroed on your brake lever and are in the process of making the easy reach...

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Oops. A bit low that time. Give it another try.

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There. Looks like you have it this time!

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Not so sure? Better give it another grope.

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Oops. Low again.

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Not even close.

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There! You're making real progress now! Stay with it this time.

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Lookin' good...

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GOT IT! And, since this isn't a situation that MATTERS...

http://www.hanggliding.org/viewtopic.php?t=14230
pro tow set-up
Jim Rooney - 2009/11/02 18:58:13 UTC

Oh it happens.
I have, all the guys I work with have.
(Our average is 1 in 1,000 tows)

Oh yeah... an other fun fact for ya... ya know when it's far more likely to happen? During a lockout. When we're doing lockout training, the odds go from 1 in 1,000 to over 50/50.
...you have a really excellent chance of that piece o' shit you're using for a bridle clearing the tow ring.

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ALRIGHT!!! Flying the glider with two hands again and everything! Image

But, what the hell... If you'd failed to maintain the correct tow position (centered, with the wheels of the tug on the horizon), the Rooney Link would've broken before you could've gotten into too much trouble.

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Well done, Jim Keen-Intellect Rooney! One more perfectly safe, incident free tow you can scribble in your log and one more flight you can add to the astoundingly long track record of your first rate Industry Standard equipment!

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And ya notice that there's not even a hint of a comment from Cragin or anyone else that it took three distinct efforts to blow this piece of shit... So you know this is totally routine. Sometimes just one or two efforts, sometimes as many as four or five, three's about average.

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Sure Felix. Whatever you and the wonderful folk running Ridgely and Quest where they've spent decades perfecting this stuff...

http://4.bp.blogspot.com/-bRrpHNa68iY/UQ6Pv9gRZyI/AAAAAAAAjTg/Hc22bx5122Q/s2048/20943781_BG1.jpg
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...say.

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