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Hang gliders don't do this

Postby Rick Masters » Fri Aug 14, 2015 5:17 pm

http://mais.uol.com.br/view/15180174
Hang gliders don't do this.
Only people on paragliders can die like this.
Look how fast it happens.
No warning at all.
No remedy.
A parachutal collapse leads to a spiral dive.
The centripetal forces are too great for the pilot to respond.
He cannot lift his arms.
He cannot throw his emergency parachute.
He is doomed.
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Re: Hang gliders don't do this

Postby Rick Masters » Sat Aug 15, 2015 3:42 pm

A takeoff technique you can't use on a hang glider.


A takeoff technique you can use on a hang glider.
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Re: Hang gliders don't do this

Postby Rick Masters » Sat Aug 15, 2015 3:56 pm

A reporter describes free flight to the public.
Now everybody will want to do it.
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Re: Hang gliders don't do this

Postby Rick Masters » Sat Aug 15, 2015 5:08 pm


You can't do this on a hang glider because hang gliders have air frames.
When I want to slow down to work lift, I push out, crank and bank.
My hang glider doesn't turn into a garbage bag. It handles like a sports car.
I regard this as a benefit.

You can do this on a paraglider.
If you want to slow down :srofl: or even steer a paraglider, you pull the "brakes"
which is para-English for destroying the shape of the airfoil and hoping nothing terrible happens.
I also know of several relatively recent fatal impalements of paragliding victims,
a result of the unmanageable vertical trajectory after they ruined their airfoil by using the "brakes"
and their parachute suddenly turned into a garbage bag.
As the video demonstrates, this was nearly another.
I'll spare you the bloody, stomach-churning details.
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Re: Hang gliders don't do this

Postby Frank Colver » Sat Aug 15, 2015 10:47 pm

A wiser choice is to fly an airworthy aircraft.

FC
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Re: Hang gliders don't do this

Postby Rick Masters » Wed Aug 19, 2015 3:36 am


:crazy: :shock: speechless...
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Re: Hang gliders don't do this

Postby Rick Masters » Sun Aug 23, 2015 10:30 am


World record attempt for mass-casualty in free flight fails.
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Re: Hang gliders don't do this

Postby Rick Masters » Sun Aug 23, 2015 12:16 pm

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Re: Hang gliders don't do this

Postby Rick Masters » Wed Aug 26, 2015 1:23 pm

Paragliders can kill their pilots in ways that are not possible on a hang glider.
The two primary ways are by collapse and by spiral dive.
A hang glider pilot might say, "That's unacceptable. I refuse to fly anything that will collapse or suddenly enter a spiral dive."
But paraglider pilots will practice collapses in SIV training to attempt to increase their ability to control collapsed parachutes.
And now they are using centrifuges to attempt to increase their ability to remain conscious and throw a parachute during a locked-in spiral dive.
Really.
It's incredible.
Common sense is GONE.
http://api.dmcloud.net/player/pubpage/4f3d114d94a6f66945000325/534baf4b94a6f649cbf042db/d406026a6e3d4172bc85c93bea675a9c?wmode=transparent&chromeless=0&autoplay=1
Now compare the speed of this silly centrifuge to a real spiral dive emergency.
http://mais.uol.com.br/view/dsirb7h509tj/lago-salva-praticante-do-paraglider-da-morte-04020D9B3160E0895326?types=A&
Be grateful for your airframe.
A lot of fine people died to perfect it.
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Re: Hang gliders don't do this

Postby AirNut » Wed Aug 26, 2015 9:13 pm

RickMasters wrote:Paragliders can kill their pilots in ways that are not possible on a hang glider.
The two primary ways are by collapse and by spiral dive.
A hang glider pilot might say, "That's unacceptable. I refuse to fly anything that will collapse or suddenly enter a spiral dive."
But paraglider pilots will practice collapses in SIV training to attempt to increase their ability to control collapsed parachutes.
And now they are using centrifuges to attempt to increase their ability to remain conscious and throw a parachute during a locked-in spiral dive.
Really.
It's incredible.
Common sense is GONE.
http://api.dmcloud.net/player/pubpage/4f3d114d94a6f66945000325/534baf4b94a6f649cbf042db/d406026a6e3d4172bc85c93bea675a9c?wmode=transparent&chromeless=0&autoplay=1
Now compare the speed of this silly centrifuge to a real spiral dive emergency.
http://mais.uol.com.br/view/dsirb7h509tj/lago-salva-praticante-do-paraglider-da-morte-04020D9B3160E0895326?types=A&
Be grateful for your airframe.
A lot of fine people died to perfect it.


If we take a look at the physics, it's even more scary.

The pilot in the centrifuge was spinning at around 2 seconds per rotation (by my rough estimate), in the second case, about 1 second per rotation (again, by a rough timing of the video). The formula for centripetal acceleration is velocity squared divided by the radius of the circle. If we take the radius of the circle at seven meters (i.e. the length of the glider lines), then we get about 5 G for the centrifuge guy and TWENTY G for the second. A normal fit individual, even with a G suit, is unconscious by about 10 G. Plus, you'll lose consciousness earlier if the G onset is sudden rather than a gradual build up (such as fighter pilots or astronauts experience). So this is why there was no chute in the second incident (assuming that the pilot could have even moved arms that weighed twenty times as much as normal).

When I was skydiving back in the mid-seventies, I remember seeing a champion-level American jumper who was visiting Australia experience a partial malfunction on a paraplane, one of the early ram-air canopies. The outer couple of cells were collapsed and she was in a flat spin, somewhat like the second video above. All of us watching from the ground wondered why she took nearly twenty seconds (a very long time in sky diving) to cut away and deploy her reserve. She said afterwards that she couldn't lift her arms up to the capewells (shoulder-mounted releases) to cut-away. It's sobering to consider that a modern paraglider has a lot more efficiency than a seventies-era skydiving canopy and would therefore be likely to generate a more savage spin.

:shock:
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