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  1. There are many things, some have been mentioned here. A few others are airfoil, the area of trailing edge being controlled and any preload on the steering lines.
  2. Just remember a drogue will not stop an out of sequence opening and infact may cause them. I believe out of sequence opening are the real problem!
  3. We did it at Para-Flite in the 1980s I did the testing on several canopies I don't remember the results any more.
  4. What troubles me is canopy opening distances today are hundreds of feet longer than in the past and some are killing people. The shape of the deceleration is important. At Para-Flite we had firm but consistent openings. I don't believe any reserve currently manufactured really meet the opening requirement of the TSO! I believe every manufacturer fudges the numbers. The reason most likely is the canopy cannot with stand the openings without destruction on the high speed test thus slowing deployments on cutaways the most common type of malfunction. Some of the requirements for militaries of various countries mandated documented drop tests with openings from 400' with zero airspeed. I don't think there are many current canopies if any that can meet that spec. Also we drop tested and TSO'd every size canopy in a family as opening characteristics are different and I'll guarentee most manufacturers only test one size and claim it is a minor modification (it is not) some even are using a TSO from an earlier canopy and saying it is a small modification. If the FAA ever looked into it most reserves would be grounded (it was a dirty little secret)! We made zero P canopies and didn't have a problem. There quite a number of proprietary design concepts to control the openings that I can tell a lot of manufacturers have no Idea what is going on. Let me throw this out there. A major manufacturer swore that the nose angle is what made hard opening canopies. The nose angle has very little to do with it. At Para-Flite we did so much R&D work to understand what happens.
  5. We used to roll pack the canopy and there was a strap sewn to the canopy on one of the Vee tapes for the B lines on the rib. You would roll the canopy then fold the lower portion and close the strap with one line stow and the rest of the lines were coiled in the container. It was important that the fold would open the strap after the line stow was released or you would have a streamer. I no longer have the instructions or I would post them. This was discontinued after a few people had lines grab one of the flaps. Using it with a d-bag would eliminate that problem. Dick Morgan invented the strap in the mid to late 1970's.
  6. Larger canopies have a larger volume than smaller canopies so fill time on a smaller canopy is less. Having worked in R&D at Para-Flite and done many test jumps and drops from small canopies to large the larger canopies opened softer. I think the hard opening problem is related to an out of sequence deployment. If that is the case the solution would be to use something like the free pack strap we used in the 1970s but still put it in a deployment bag. That would insure you are at line stretch before inflation starts and the slider is still in position.
  7. The lollipop handle looked it came from the F1b opener!
  8. 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.
  9. 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.
  10. 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.
  11. Well that sounds like the old pilotchute assist from the 1960s on static lines so that would be prior art and void the patent!
  12. Again your beef should be with Airborne not Sandy!
  13. 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!
  14. 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.
  15. 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!