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  1. You really need to document the the loads during opening. What I'm seeing here nobody has any Idea what they really are. At Para-Flite more than 40 years ago we used instrumentation on opening forces. You cannot use simple calculations as the opening characteristics are very complex. I can tell you from experience that a 3g opening can feel much harder than a 7g opening. The duration is a key point. I had several 14g plus openings documented.
  2. All it has to do is change the amount of time the spike hits. During test jumps at Para-Flite I had several openings above 15g's documented The duration of the spike was very important. The majority of those were with Dacron lines.
  3. It seems a more reliable solution would be something like a urethane bumper in maybe a metal sleeve (think shock absorber) the urethane is available in different hardness / compression would make it tunable and reusable and wouldn't cause uneven risers. With stitching it would degrade with jumps and be difficult to know it's strength was degraded.
  4. Well that sounds like the old pilotchute assist from the 1960s on static lines so that would be prior art and void the patent!
  5. Again your beef should be with Airborne not Sandy!
  6. My understanding is it is licensed from Airborne so your fight is with Airborne and not Sandy. Since he licensed it from Airborne I would expect Sandy to be silent!
  7. I read the whole thread. Now some questions for you. Have you asked for a refund of the money that went to the museum? If so what was the response? Do you ask for refunds of your tax dollars that go to things you don't agree with? USPA is the agency that is central for all things skydiving in the US so why shouldn't they support a very important part of the sport. The only narrow mindedness I see is someone seems to want to run the museum and is pissed he can't so is trying disrupt it. Good things take time.
  8. Baronn all I see is you bitching and complaining. Why don't you run for USPA? All you have are problems with no solutions. This thread is becoming as bad as DB Cooper!
  9. Has anyone done a break down of actual cost per member? I'll bet it is much lower than you think! History is important to save. Without history skydiving would not be where it is today. Having been around since the early days I know a lot of the history of the sport. Very few of today's jumpers have any clue of how their equipment or discipline has evolved! There are so many wrong "facts" floating out there that some people take for gospel and it is important that history is correct so you don't repeat the mistakes over and over! A very few number of people for what ever reason or personal agenda are trying to influence the majority by trying to make the loudest noise. I say look into why they are fighting so hard. Did they get snubbed or is it they aren't making money from it? It must be something to put a burr under their saddle (without history you wouldn't know that was a thing)! Just my 2ç
  10. Para-Flite had some Para-Plane Couds were made with Zero porosity fabric early 1970's I doubt we were the first production canopies. They were not marketed that way. Some people nick named them Crispy Critters. I think probably the Barrish SailWing was the first back in the early 1960s. Parachute DeFrance had the first modern ZP fabric that PD and others copied. Raven Industries (balloons) did some plastic film parachutes earlier than that; But there could be others.
  11. Back when I was jumping I could pack in under 5 minutes. The K.I.S.S. principle still works.It's like anything practice makes perfect.
  12. Sky Diving is dangerous and has been since the beginning! However there are things you can do to lessen the danger.
  13. A giant in this sport! R.I.P. Dave say hi to Joe Smith!
  14. When I worked at Para-Flite we did lots of work with domed sliders and also lipped sliders. As a matter of fact we used them on our cargo delivery systems in the mid to late1970s up until the time I left in 1995. Now having lines dump due to bad rubber bands this can cause an out of sequence opening and no slider will prevent that. If the canopy is out of the bag before line stretch it can spread. Without tension on the lines the slider cannot contain/restrict the opening as the canopy has started to inflate. Domed sliders can increase the snatch force create a spike in felt opening shock. I had many instrumented jumps measuring g forces some with very low g forces felt harder than much higher g force openings due to the length of time the forces were occurring. Out of sequence opening can kill or injure.