Nope, NOBODY foot launches or uses 2:1 bridles.
That was in the context of aerotowing.
Nobody, that is, except those in the US, Australia, South Africa, Poland, Uruguay, Canada, England, France, Russia, Turkey and wherever else foot-launch static line towing is being done.
1. Not in England. Static line towing hang gliders is illegal in the UK.
2. So what? Wallaby and bent pin barrel releases and 130 pound Greenspot weak links are pretty much the global standard in aerotowing. People the world over launch on the assumption that they're hooked in based upon procedures they remember or think they remember having done five or ten minutes ago. All gliders have backup loops in case the doubled six thousand pound primary webbing breaks.
3. What percentage of towing in the US do you think is foot launch static?
4. What percentage of European surface towing is being done with a two to one bridle versus a Koch two stage?
5. Where's all the carnage that I keep hearing these Kochs are supposed to be causing?
EVERYBODY knows people who compare apples and oranges are willfully blind fools.
1. Not sure I'm following you here.
2. How 'bout people people who compare apples to horse excrement?
And EVERYBODY knows one shouldn't argue with an idiot: When you argue with an idiot people cannot tell the two apart.
Yep. That IS a problem, Peter. And when an evolutionary biologist argues with an intelligent design theorist in Texas the first guy is always gonna be the idiot.
So after your having denigrated for the last time my good friends Don Hewett and Rob Richardson...
Sorry, I missed the parts where I denigrated either of your good friends. Can you quote me something?
I'm not denigrating Donnell - just sayin' he majorly screwed the pooch. He got the assumptions and the physics wrong and IF you could understand high school physics you would be capable of understanding that.
Donnell Hewett - 1982/07
By the way, in your evaluations, please do not withhold criticism for fear of offending me- the lives of future pilots are more important than the feelings of an individual. If something is wrong with our system, it needs to be corrected, and if anything is suspicious, it needs to be investigated. Thank you for your interest and involvement in the effort of improving towing safety.
But it's too late now. Center of mass towing, readily accessible releases, and weak links which will infallibly and automatically release the glider from tow whenever the towline tension exceeds the limit for safe operation are now foundations of the religious cult of hang gliding and carved into official and unofficial regulatory granite. And the ONLY thing that will put a dent in that crap is a physics literate suicide bomber such as myself.
If you REALLY were a good friend to Donnell you'd understand what he got wrong and try to fix it - but that's WAY above your pay grade. All you've got is "It must be OK 'cause he's a physics professor and lotsa people are doing it that way."
Denigrated Rob Richardson? You don't have the reading comprehension level of a below average fourth grader.
I'll try again. See if you can get whatever your using for a brain working well and long enough to follow this...
Manned Kiting
The Basic Handbook of Tow Launched Hang Gliding
by Daniel F. Poynter
1974
"Never take your hands off the bar." - Tom Peghiny
"The greatest dangers are a rope break or a premature release." - Richard Johnson
"A bad flyer won't hurt a pin man but a bad pin man can kill a flyer." - Bill Bennett
Then in 1981 Donnell comes along and starts convincing everybody that...
Sometimes I am asked if a more conventional release mechanism would be preferred. Specifically one wonders whether it would be wiser to have a release lever right there by the pilot's hand rather than located on his abdomen. Well, yes, it is true that a conventional hand release would be quicker to release than a body release, but in a typical emergency situation, the pilot's hand release is seldom located at the right spot on the control bar to effectively initiate the release, and in a truly panic situation, it is much easier for a person to find a release on his own body than at some specific location on the control bar.
...it really doesn't matter where you put the release actuator...
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." Well, I for one have been saved by a weak link and would not even consider towing without one.
...a rope break or a premature release is actually a GOOD thing, and...
REGARDLESS OF WHO IS REALLY AT FAULT, NATURE HOLDS THE *PILOT* RESPONSIBLE FOR A HANG GLIDING ACCIDENT. (Look who got hurt.) Skyting is designed to give the pilot more control over his flight than any other member of the flight crew. Even if the ground crew "goofs up", the pilot has the means to get himself out of danger if he only does the right thing.
...a bad pin man really can't hurt or kill a flyer.
And then a little over a year before Rob is needlessly killed two stupid EVIL BASTARDS publish a stupid EVIL book called "Towing Aloft"...
Peter Birren
The excellent book, Towing Aloft, by Dennis Pagen and Bill Bryden...
...full of crap like THIS:
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.
So then when your GOOD FRIEND Rob accidentally hooks the launch dolly with his two point bridle he can't abort the tow when, while still on the ground, he first realizes something's wrong 'cause his hands are on the basetube and the release lever is on the downtube 'cause people like Donnell, Dennis, Bill, and YOU have been telling him that that's OK.
So then he gets airborne and while he's trying to get enough airspeed to be able to ride the situation out, Corey makes a good decision in his favor, does a manual Pitch and Lockout Limiter number on him, kills his thrust, stalls the crap out of him, and breaks his neck.
Any of that make any sense to you? Nah, just kidding.
...twisting the words and experiences of both to suit your own agenda...
Uh, yeah. So exactly what is my agenda? I keep forgetting.
...and the impossibility of carrying on a rational discussion with you...
Yeah, I'd say that it IS impossible for you to carry on a rational discussion with me.
...I'm done.
1. Hell, you were done fifteen years ago five minutes after you put two X-Acto knife blades in a plastic tube and declared all hang glider towing problems history.
2. OK. But you might wanna keep watching your six - 'CAUSE I'M NOT. And you've given me A LOT of really great material to work with.