Death at Quest Air
Really Paul?Paul Tjaden - 2013/02/03 02:45:02 UTC
...and the glider was in good airworthy condition.
A hang glider isn't certified as airworthy unless there's a pilot hooked in between the minimum and maximum specified weight and he's suspended underneath it in position to use the glider's full pitch/speed range.
Dennis Pagen writes of a thermal related aerotow takeoff fatality and near miss of his own, both very similar to the recent fatal incident at your flight park...
...that towing only from the shoulders reduces the effective pull-in available to prevent an over-the-top lockout.Dennis Pagen - 2005/01
Thirdly, experienced pilots should be aware that towing only from the shoulders reduces the effective pull-in available to prevent an over-the-top lockout.
Wasn't Zack...
...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? Wouldn't that have reduced the effective pull-in available to prevent an over-the-top lockout?Paul Tjaden - 2013/02/07 23:47:58 UTC
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.
Isn't a glider under tow...
http://www.hanggliding.org/viewtopic.php?t=11497
Aerotow release options?
...a POWERED aircraft? String powered?Michael Bradford - 2009/07/04 13:00:24 UTC
Rock Spring, Georgia
A glider under tow is a powered aircraft. String powered.
And if the tow force is subtracted instantly...
...isn't the angle of attack instantly translated, whether or not there is pilot input?When climbing under power, the angle of attack is relevant to the climb path, not the horizon. And if the tow force is subtracted instantly, the angle of attack is instantly translated, whether or not there is pilot input.
Can't a classic Departure Stall...
...easily, almost instantly, result?A classic Departure Stall can easily, almost instantly result. Pitch and power are not independent forces.
If a glider under tow is...
...a powered aircraft, wouldn't it be as critically important to ensure that nothing...A glider under tow is a powered aircraft.
...can interrupt that power - especially on takeoff and climbout - as it is for any other powered aircraft?Paul Tjaden - 2013/02/07 23:47:58 UTC
A standard 130 pound test weak link was being used.
Doesn't a standard 130 pound test weak link...
http://ozreport.com/forum/viewtopic.php?t=24846
Is this a joke ?
...have something of a reputation for interrupting power on takeoff and climbout?Davis Straub - 2011/08/26 14:04:52 UTC
We had six weaklink breaks in a row at Zapata this year.
Shouldn't you folk at Quest who've been perfecting aerotowing for twenty years...
...know something about that?Russell Brown (tug pilot, tug owner, Quest Air owner) said go ahead and double up (four strands of Cortland Greenspot). He knows I used his Zapata weaklink in Big Spring (pilots were asked to tell the tug pilot if they were doing that).
Remember when...
http://www.chgpa.org/forums/viewtopic.php?f=2&t=988
Another HG tragedy
...Jeremiah Thompson and Arlan Birkett, his tandem aerotow instructor, on 2005/09/03 after their nose high string powered aircraft became unattached from the tug as a consequence of somebody having tied a couple of elements of the tug's towing system together with a piece of fishing line?Paul Tjaden - 2005/09/05 23:55:24 UTC
Don't know if you guys are aware of this but I haven't seen anything on the forum so I thought I'd better post it.
Arlan Birkett (owner operator of Hang Glide Chicago) and an unidentified student died in a tandem hang gliding accident while on tow at Cushing Field near Chicago on Saturday evening at about 6:30. The details of the accident are not known although eye witness reports vary quite a bit. One witness said the glider fluttered and spun to the ground from two hundred feet up like a wounded bird while another said they locked out low and impacted before they could recover from the wing over created by the lock out. The student was said to be fairly experienced and just about ready for solo flight.
I met Arlan at Quest a couple years back and got to know him pretty well. He was a kind and lovable guy that gave a great deal to the sport and to the people who knew and loved him. He will be greatly missed.
Did you read the advisory USHGA put out in response to this one...
http://www.ushpa.aero/advisory.asp?id=1
Safety Notice
...warning that a very abrupt stall of a tandem glider could be caused which would result in a much greater altitude loss than one would expect? That you might even get a tumble and structural failure out of the deal?HG Tandem Aerotow Operations - 2006/03/15
Should the tandem glider become unattached from the tug during this maneuver, the nose high attitude of the tandem glider attained while doing this will cause a very abrupt stall which will result in a much greater altitude loss than one would expect (possibly more than 750 ft.) The most extreme cases may result in structural failure of the glider.
What did you think about THIS:
part?These points are crucial to the safety of aerotow tandem flight. However, this letter is addressed to all aerotow rated pilots and tug pilots, not just to tandem pilots. This is because in consulting with pilots about this issue, we found that this problem is exhibited under the same circumstances with solo gliders as well. Because of the lighter wing loading of the solo gliders, the reaction of a solo glider is not as severe, but can still be violent.
Frankly, I didn't think it was all that much of a stretch to conclude that if a nose high tandem glider could go down like a fuckin' brick when the string popped...
...a solo glider probably could too. Hell, I've had my solo glider go down like a fuckin' brick just by the air dumping me - no intact or popping strings anywhere around at all.Donnell Hewett - 1981/10
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"...
Sure is a good thing the reaction of solo glider, "because of the lighter wing loading"...
http://4.bp.blogspot.com/-bRrpHNa68iY/UQ6Pv9gRZyI/AAAAAAAAjTg/Hc22bx5122Q/s2048/20943781_BG1.jpg
...isn't as severe, isn't it Paul?
If you should happen to see Steve Kroop...
...tell him to go fuck himself for me. Paul Voight goes without saying.David G. Broyles, Chairman of Safety and Training Committee
Steve Kroop, Chairman of Tow Committee
Paul Voight, Chairman of Tandem Committee