[JoeF]

http://www.google.com/patents/US3442501
Part of a solution might include non-rebound shock absorbing, as rebound is drastic and is to be avoided. One direction of solving could use the queenposts as holder of air to be used in the non-rebound shock absorbing. The ski can be below the basebar by substantial amount so that boulder and brush do not snag or catch the basebar during impact action. The rear of the ski could be with a posting that pistons into the queenposts (TCF downtubes). Then also, after som ski impact some wheeling could get exposed or not. The surface of the ski might be moving surface as conveyor belt or teflonized or with ablative material. Choices to explore.

Other non-rebound tactics: bungee with piston cam catched to prevent return or rebound until after landing event; then perhaps release cam for reset for next flight.

On pilot-body arresting: Limit lines from the bottom of the queenposts (downtubes of triangle control frame TCF) would perhaps be an option to the BobK stepped arrestors or in combination with such.
Motivation:


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Another motivation:


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Sketch of a direction:

[JoeF]

Motivation for SSS (Safe-Splat Solutions)
Chelan Whack!


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More Motivation (MM)
Big Sur Wack


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Transformer solution? Trigger for the entire wing to become a huge roller with pilot body pulled to center.

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Gravity is part of the Safe-Splat story:

[JoeF]

Flying-Machine era


Motivation
Hang glider landing whack

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RWW Roller When Wanted
Transforming speedbar into large-diameter roller when wanted.

[terryJm]

Man, you think fast, I'm only 2Parsect behide, and you,ve only been teasing me? Please forgive the obscure since of humor, a little goes along way, I'd like to be part of the solution; work, sleep, flying, singing, all get in the way. We have so little time in this life, also; dont let me get in the way, I'm just a survent, and a flash in the pan! seeYasoon, Terry

[Bill Cummings]

BobK,
I am assuming the diagram accepts a stopped basebar while the circle with yellow and black is the pilot's body while the main hang line is with a set of graduated arresting lines going to the aft keel? Is that correct about the drawing? [ ] This is to be explored for its actualities; this can be explored first with model splats and video. Parallel with that visual study could be a mechanical vector analysis. Changing the degree of basebar stoppage and the amount of arresting-line resistance would be neat. A variable program changing the skid of the basebar at various speeds with various wing masses and pilot masses could be a masters degree project for someone. Just how much basebar skidding would change things against how much arresting ... and the still swing path of the pilot would be interesting. Some whacks nearly decapitate the hang glider pilot with nose whacking on the head and neck for some gliders.

Yes, the diagram shows the pilot's motion assuming that the base bar has been completely stopped. Of course, the glider would also be rotating forward which is not shown in the drawing (or animation), so you have to superimpose an additional rotation on the drawing.

I didn't want to write a program to do it "right", but I did superimpose my drawings to create the following animation. As you mentioned, this shows the base bar stopped and the glider in a fixed position. In reality, the glider would be rotating forward, but as it does so, the lines would be dynamically shifting the pilot's attachment point rearward. Here's the animation:

anti_whack_restraining_lines_f1.gif

Anti_Whack_Restraining_Lines

Bob,
As a diver (three meter board and six meter board.), skater (ice type), and having been on a trampoline doing somersaults, it has been my experience that tucking into a smaller ball off of the diving board or trampoline will accelerate the somersault rotation speed. Opening up the tuck will slow the rotation speed.

While spinning on the ice moving arms and free leg in closer to the rotating axis of the body will accelerate the rotation speed.

In my estimation the tightening of each restraining lines will shorten the arc that the pilot is traveling and would accelerate the pilot into the keel tube.

What do you think?

Also would a KPL keel take the load of the restraint lines?
Bill C.

[Bob Kuczewski]

Bob,
As a diver (three meter board and six meter board.), skater (ice type), and having been on a trampoline doing somersaults, it has been my experience that tucking into a smaller ball off of the diving board or trampoline will accelerate the somersault rotation speed. Opening up the tuck will slow the rotation speed.

While spinning on the ice moving arms and free leg in closer to the rotating axis of the body will accelerate the rotation speed.

In my estimation the tightening of each restraining lines will shorten the arc that the pilot is traveling and would accelerate the pilot into the keel tube.

What do you think?

Also would a KPL keel take the load of the restraint lines?
Bill C.

You may be right Bill. Conservation of angular momentum does increase the rotation rate as the circle gets smaller. Your figure skating analogy is an excellent example of that effect!! But there's a lot going on there, and it's not clear to me what would happen. That's why I'm curious if anyone has tried it before.

As for damaging the keel from the restraint lines, I think that might be an acceptable tradeoff for many pilots if it saves them bodily damage.

[JoeF]

Typo on image link call is here corrected for Ski Glider Sharing the side view of its drawing.

[Bob Kuczewski]

How about a more traditional solution ... intentionally landing on fairly large wheels with a tailwheel on the keel? Lots of tandem pilots do that very successfully. I think that's also what Tad has advocated. It works especially well if you're landing in a prepared field like Sylmar or Crestline or Wallaby. My tandem at Wallaby was landed on the wheels and it allows the pilot to stay prone and on the base tube throughout the entire process.

[JoeF]

Adding theTandem Traditional Tri-Wheel ( "3TW" or TTTW) option to the spectrum as proposed by BobK!
Your note brings to fore:
1. Amount of awareness of landing area and its design
(this parameter can be from very open mysterious to very sure planned).

2. Rear-keel wheel could be spoon skid, hook for arresting catch, floating spoon for water and bog and marsh

3. Forward wheels may be floating wheels for water floating option.

4. The TTTW direction has option to be combined with other Safe-Splat options.

5. "When wanted" parameter comes in various means:
A. Single flight with high-certainty of landing-zone texture/design.
B. Mysterious landing-zone XC allowing soil or water landings, upslope-downwind, downslope-downwind.
C. Low-mass explorations
D. Hidden when not wanted, but deployable when wanted at launch or landing sector. Out of sight and out of drag-making when not wanted; but when wanted, deploy into position.

6. Groomed launch and landing areas versus challenge areas.

7. Mass cost tracking over solution set.

MOTIVATION:
Moments of Impact: Swooping Skydiver Lands Hard [[Downwind without Safe Splat™]]

[JoeF]

Safe-Splat and the braking realm?



In some Safe-Splat scenarios there may be specific wishes for focused braking means.
[[E.g. In deliberate asphalt urban automobile street of downslope landing with tight options, like in avoiding reaching intersection; or at a tight slope bottom where hazards exist. ]]

Braking?
Consider:
1. Ablative?
2. Deliberate gouging
3. Trigger rear plowing
4. Braked conveyor http://en.wikipedia.org/wiki/Conveyor_belt
5. Brakes on wheels or rollers.
6. Air brakes. Drogue? Super transformation of wing? Drawn curtain?
7. Arrestors pre-set in LZ.
8. Deliberate landing into air-held nets. "landing nets". Have kite system hold up a large catchy net. Snag it. Airborne Safe-Splat ?
9. Very-giving perches?
10. Deliberate snag aerial bungee
11. Cushion field (foam, boxes, leaf piles, giving fencing, graded curtains, ?
12. Long ice flat
13. Long slip-and-slide
14. Fly to flare landing in aerial horizontal catch net
15. Fly to snag aloft points on a large flying kite system.
16. Retro rocket
17. Explosively set soil anchor after skid is started and have resistive payout line for braking
18. ?


Click for an aerial net: http://www.flickr.com/photos/powerhouse_museum_photography/6168181639/


MOTIVATION: