[reluctantsparrow]

so many different ways to rig a one-line system....here is the way i may go out and try this afternoon.

one line fastened to the pilots harness, runs over and through a small pulley mounted on the right rear flying wire, then runs over and through another pulley on the left flying wire, then is routed back to the pilots harness and tied off.....like a triangle.....I guess it does not have to be tied off at the pilots harness....I guess that could float too.
this would rely on very efficient pulleys on the side wires that can not jam in any way for the pilot to freely swing side to side in regular flight but would also provide better shock absorption from the rear flying wires as they are more aggressively squeezed together as the pilot swings forward..... it would also allow the pilot a farther forward motion than if the lines are simply tied off to the rear side wires....

[Bill Cummings]

so many different ways to rig a one-line system....here is the way i may go out and try this afternoon.

one line fastened to the pilots harness, runs over and through a small pulley mounted on the right rear flying wire, then runs over and through another pulley on the left flying wire, then is routed back to the pilots harness and tied off.....like a triangle.....I guess it does not have to be tied off at the pilots harness....I guess that could float too.
this would rely on very efficient pulleys on the side wires that can not jam in any way for the pilot to freely swing side to side in regular flight but would also provide better shock absorption from the rear flying wires as they are more aggressively squeezed together as the pilot swings forward..... it would also allow the pilot a farther forward motion than if the lines are simply tied off to the rear side wires....

Start the camera

[reluctantsparrow]

Here you go Bill. Ill show you mine if you show me.......okay, that is not family appropriate is it?
You dont have to show me yours. Heres mine, I am calling it the BERMUDA TRIANGLE SAFETY SYSTEM.
dumb name, I know

[Bill Cummings]

Here you go Bill. Ill show you mine if you show me.......okay, that is not family appropriate is it?
You dont have to show me yours. Heres mine, I am calling it the BERMUDA TRIANGLE SAFETY SYSTEM.
dumb name, I know

https://www.youtube.com/watch?v=Tmxug1LiW1w
That was fast.
Now we could really use some Nay Sayers to point out any aspect of this US Hawks Brainstorming Triangle Retention System that will be a problem.
This has so far reduced the weight that ARP had suggested from earlier ideas/plans.
This will allow the glider to absorb energy that the pilot was the recipient of when arriving at the impact zone. (Usually 30 minutes ahead of the first responders.)
Next we could use ideas to reduce abrasion at the harness straps.
What else Hawks?
GOOD JOB RS
EDIT: At 2:57 and just after, I can see where a greater force forward will allow the harness mains to draw closer together allowing greater forward travel.
Yet I do like that it slowly applies more restraint as the swing through occurs.

[reluctantsparrow]

No, incredible job EVERYONE! (and it still might not work)
Your ideas fed my ideas, that fed more of your ideas.
This is how the world is SUPPOSED to work.....and BoB set up this whole interface for sharing, and Joe started the whole splat thing rolling.
And it still might not work, Ill rig up a zip line when I find some rope, work up a genuine prototype, and crash test it good and proper, I will run the set up by the local gurus, Scotty Cambell and Kenny Richardson and if the majority vote says its clean and wont snag on anything I will flight test it as well.....been nice knowing you guys.......RS

[ARP]

RS & Bill,

My original proposal was to have the restraint line attached to the control bar. As the pilot is attached to the keel by the main hang strap the trajectory of the pilot will follow the arc made by that strap so the chest/control bar restraint will not pull the pilot,s head into the ground as suggested. The control bar will absorb the deceleration loads progressively and if high enough the bar will bend and maybe fail but in a progressive manner. As most control bars have an internal cable this would then take up any residual energy.

The restraint line could be constructed using a tube tape with an internal bungee to keep it from getting caught up on any thing and depending on how much tension used could act as a hands off self centering mechanism for the pilot in flight.

Tony

P.s. RS you could make up a mockup of it without to much trouble as you did with your rear restraint line.

[Bill Cummings]

RS & Bill,

My original proposal was to have the restraint line attached to the control bar. As the pilot is attached to the keel by the main hang strap the trajectory of the pilot will follow the arc made by that strap so the chest/control bar restraint will not pull the pilot,s head into the ground as suggested. The control bar will absorb the deceleration loads progressively and if high enough the bar will bend and maybe fail but in a progressive manner. As most control bars have an internal cable this would then take up any residual energy.

The restraint line could be constructed using a tube tape with an internal bungee to keep it from getting caught up on any thing and depending on how much tension used could act as a hands off self centring mechanism for the pilot in flight.

Tony

P.s. RS you could make up a mockup of it without to much trouble as you did with your rear restraint line.

Your proposal also brings a desirable feature in that the pilot has everything in front where getting free of the glider would be easier if a water landing occurred.
EDIT: Just thought -- What about parachute deployment with either front or rear restraint system?
Also what "G" load should the restraint system be expected to realistically withstand and to not be over built, air drag, stronger than the glider?

[ARP]

Bill,

A quick release of the chest line should not be too difficult to fit and use as it is right in front of the pilot. Depending on where the emergency parachute is located will determine how the chest line can be attached but it need not be released if the parachute can be thrown with it in place. The added attachment point will increase the security of the pilot in the event of parachute deployment. Having the restraint line behind the pilots back might make releasing it difficult in a water landing!

Tony

[ARP]

RS & Bill,


My original proposal was to have the restraint line attached to the control bar. As the pilot is attached to the keel by the main hang strap the trajectory of the pilot will follow the arc made by that strap so the chest/control bar restraint will not pull the pilot,s head into the ground as suggested. The control bar will absorb the deceleration loads progressively and if high enough the bar will bend and maybe fail but in a progressive manner. As most control bars have an internal cable this would then take up any residual energy.

The restraint line could be constructed using a tube tape with an internal bungee to keep it from getting caught up on any thing and depending on how much tension used could act as a hands off self centring mechanism for the pilot in flight.

Tony



I will leave the calculations to the mathematicians amongst us but if you assume an approach speed of 25mph and know the pilots weight and add in the deceleration distance then the restraint strength can be calculated. Most materials will stretch under load which will help absorb the loads but it might add a recoil factor if it has too much spring in it.


P.s. RS you could make up a mockup of it without to much trouble as you did with your rear restraint line.

Your proposal also brings a desirable feature in that the pilot has everything in front where getting free of the glider would be easier if a water landing occurred.
EDIT: Just thought -- What about parachute deployment with either front or rear restraint system?
Also what "G" load should the restraint system be expected to realistically withstand and to not be over built, air drag, stronger than the glider?

[JoeF]

Please keep up the great flow going in above posts.

This present post is a wheel example
besides showing a pioneer celebrating his dad's legacy
with furtherance