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Re: Safe-Splat

Postby JoeF » Fri Jan 13, 2012 2:50 pm

Sam Image Good to hear from you! :)
Yes, animals may lead the way. Water Safe-Splat. Ice and just enough friction, etc.
Image
How might explosives play in
airbags or
short lift or
short airspeed regain or ?
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Re: Safe-Splat

Postby JoeF » Fri Jan 13, 2012 7:01 pm

Exposure motivation for SSS (Safe-Splat Solutions).
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Re: Safe-Splat

Postby JoeF » Sun Jan 15, 2012 11:24 pm

Tow shares on project:
1. Motivation:

2. Plate inner backed with frequency-lowering shock-absorbing foam shaped to fit pilot curves. High-frequency tends to shatter bones; this is partially mitigated by lowering the frequencies of impact. Spreading the forces by outer plates also helps.
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Re: Safe-Splat

Postby Bob Kuczewski » Sun Jan 15, 2012 11:48 pm

Excellent videos Joe!!

We could use the towing example in several places in the training manual. It's obviously applicable to towing, but it also shows how long it takes to recover (or not recover) from a stall break at low altitude. Do you know what caused the rapid pitch up just prior to the stall?

Thanks for a great find!!
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Re: Safe-Splat

Postby JoeF » Tue Jan 17, 2012 2:10 pm

Clarification over the note:
JoeF wrote:Tow shares on project: ...
2. Plate inner backed with frequency-lowering shock-absorbing foam shaped to fit pilot curves. High-frequency tends to shatter bones; this is partially mitigated by lowering the frequencies of impact. Spreading the forces by outer plates also helps.

By "frequency" is not meant the number of incidents, but rather the vibrations set up at a particular impact. Hit a hammer on glass with the glass based on concrete and notice that the impact frequencies are high, i.e., the number of oscillations per second. Bones shatter more easily when the frequencies set up in an incident are high. One task is to reduce the frequency that occurs in an impact.
====
BobK,
On that last video: I do not have the detail story behind the sudden pitch up to stall. Open matter until we get it.
Yes, for a particular glider with a particular pilot: a certain recovery vertical distance! Such distance is something that should be well known by each pilot.
JoeF

================
New furthering:
For ski runners in Safe-Splat: I aim to explore titanium tube holding an interior safety cable.
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Re: Safe-Splat

Postby Bill Cummings » Tue Jan 17, 2012 4:23 pm

JoeF wrote:Tow shares on project:
1. Motivation:

2. Plate inner backed with frequency-lowering shock-absorbing foam shaped to fit pilot curves. High-frequency tends to shatter bones; this is partially mitigated by lowering the frequencies of impact. Spreading the forces by outer plates also helps.

From the looks of the “hang gliding ouch” and the other video’s by Harastee their tow method looks to have the primary release hanging from the keel ahead of the hang strap.
It looks to be a two point bridle (keel to tow/ring to pilots waste.) I think it looks like a one to one bridle.
On a video Hg kurs Lillestrøm 3:32 and 3:40 it looks like a barrel release near his body/leg. (Back up release.)
They all seem to be dragging the un-threaded tow bridle upon landing.
I can’t see how they are activating the release.
Speculation:
1) Weaklink break during a steep unrestrained climb.
2) Release during a steep unrestrained climb.

Resulting in a hammerhead stall too close to the ground.

The motor rpm didn’t increase at the start of the steep climb out.
It was overcast but that wouldn’t necessarily rule out flying into a thermal to cause the steep climb out.
Did the pilot push out to cause the steep climb out?
Did the pilot climb out of the lower wind speed gradient into a faster wind speed to start the steep climb out?

The cause of this crash should not be placed on a release failure or a weaklink failure.
A pilot should never tow in such a fashion that does not plan, at any second, for a weaklink failure, line break, scooter failure, encountering a thermal, or wind gradient.
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Re: Safe-Splat

Postby Neil Larson » Tue Jan 17, 2012 6:37 pm

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From Day One
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Re: Safe-Splat

Postby JoeF » Wed Jan 18, 2012 12:13 pm

Fun FromDayOne!
Bill, thanks for forwarding examination of the stall video.
==============================
Toward busable HGs with Safe-Splat solutions:
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Legend: FLG flatland long gliding starts and stops soon off flatland.
Other legend glossary: HERE.
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Re: Safe-Splat

Postby SamKellner » Wed Jan 18, 2012 6:35 pm

billcummings wrote:Resulting in a hammerhead stall too close to the ground.

The motor rpm didn’t increase at the start of the steep climb out.
It was overcast but that wouldn’t necessarily rule out flying into a thermal to cause the steep climb out.
Did the pilot push out to cause the steep climb out?
Did the pilot climb out of the lower wind speed gradient into a faster wind speed to start the steep climb out?

The cause of this crash should not be placed on a release failure or a weaklink failure.
A pilot should never tow in such a fashion that does not plan, at any second, for a weaklink failure, line break, scooter failure, encountering a thermal, or wind gradient.


Hi Bill,

The pilot/student seemed to be keeping the glider level. That's a good thing. I surely agree that you always have to be ready for a premature release.

The scooter operator seemed to be the contributing cause.
First, the glider was too high to be a low&slow method.
Then, when the pitch up occured, the operator throttled back too much. :?:

Seems to me if the operator towed with enough force to ger the glider that far off the ground, cutting the throttle completely was a mistake.

I've seen a Reg11 instructor make some bad errors as operator.
Once, immediately after release, reduced throttle resulted in the glider hitting the drogue. Luckily nothing tangled.


We got the roller fairlead for our scooter tow, today. :thumbup:
We're about ready to try it out.
A Condor or Falcon 195 with big wheels would be nice.
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Chapter #4
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Re: Safe-Splat

Postby JoeF » Thu Jan 19, 2012 9:00 pm

Motivation for Safe-Splat, perhaps:
Funny Hang Glider Crashes

=================================
Forwarding one avenue of Safe Splat:
There seems to be some opportunity in lateral splay of ski runner with resistive arrangement off the TCF basebar; such might be combined with some vertical resist along (or into) the two queenpost uprights. Splay left for left runner and splay right for right runner might win.
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