CoolBeans

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    Volt 210
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    Cypres 2

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  1. I'm interested, sent PM
  2. You guys are talking about completely different solutions to hard openings that are not related to adding shock absorbing component to risers or harness. They are all valuable but please keep them in separate topics. Otherwise it gets difficult to follow the discussion. Also, remember that multiple solutions can exist at once, they are not competing against each other.
  3. Do Dacron lines affect performance of the canopy in a noticeable way? Let's say I'm talking about Sabre 2 190 sqft. How different would fly Sabre 2 190 sqft with Dacron lines vs one with HMA, Vectran or Microline? Also, can ANY canopy be relined with Dacron lines?
  4. That! You just need to push through it, it gets much better and easier with jumps. You can always do coach jumps too - that way you have another person with you on the jump.
  5. I had a shoulder surgery, torn labrum. Got 6 bolts into my shoulder. Bioabsorbable Suture Anchors to be specific. The shoulder is like new now, I'm jumping and I don't need no braces. I retained 100% of the mobility and range. But I took that project very seriously, I made sure I had decent insurance, extra cash on a side, I picked the doctor, the hospital, I picked the rehab center and was following the program very religiously. I was back in the sky about 10 months after the surgery. Good luck, it can be done.
  6. If a friend of mine wants to do the tandem - what criteria would I have to fulfill as a fun jumper to be around and jump together? Just curious, don't judge. It can be either with another video jumper or without them. Either way.
  7. That's what I found so far, simple review from somebody who did 2 jumps on it :)
  8. It sucks a lot the gear was stolen. I just thought the first picture was really cool!
  9. Guess what, Asians make even more than Whites. And Hispanic make even less than Blacks. https://iwpr.org/publications/gender-wage-gap-2018/ Why is nobody crying about that?
  10. What if I add 2 inch fold of the webbing around the breaking point, so once it breaks the risers are still usable? That's exactly what I'm explaining from the beginning. Think of "Shock absorbing risers" just like regular risers that break at specified load, except, they can break multiple times at staggered loads and you can still land them afterwards.
  11. I figured I could do some basic testing in garage conditions. I would need to get a hold of some old 3-ring system and some old risers that I could reuse to make a prototype. Does anybody know what's the easiest/cheapest way to go about obtaining old/used risers and 3-ring systems? I'm in California / Bay Area.
  12. Let's start from the basics, the source of the problem is how many Gs are experienced by the jumper. Simply let's say, <6G the opening is ok, 7G - 12G would be pretty hard, 13G+ would be life threatening. That's just rough guidance. In any case, we are dealing with abrupt slowing from approx 120mph down to approx 20mph, that's a difference of 100mph that needs to be dissipated. If the parachute opening completes within 0.3 sec it will put 15Gs on the jumper. If we can do anything to extend that process to e.g. 0.6 sec it will put 7.5Gs on the jumper. That's what's most important here. If shock absorbing risers can maintain the process of tearing for the duration of only 0.3 sec they will eat up 7.5Gs that jumper won't experience. Or in other words, they will make jumper experience 7.5Gs over 0.6 sec instead of 15Gs over 0.3 sec. As a side note, 0.1s opening would take 45Gs and 0.2s opening would take 22.5Gs. 22.5 is better than 45, ain't it? Dacron lines do pretty much the same thing, they flex extending the opening duration and eat up Gs. Advantage of the shock absorbing risers is that during normal operation they don't flex like Dacron lines do, they only flex on super high Gs
  13. Uneven risers in case of hard opening are pretty much guaranteed. However, I bet anybody who went through serious hard opening would have traded that for uneven risers. Uneven risers leave pilot with two options, either pull one riser to make them even or cutaway. I suspect one could also correct uneven risers with toggle input, obviously that depends on how badly uneven the risers would be. Small improvement to help with uneven risers would be to put flexible element inside the folds so that way after stitches are torn, the flexible part would still maintain original riser length. The outcome would be same or very similar length risers but flexible. Although, they wouldn't flex all that much as normal canopy flying wouldn't put 7G+ forces. I've done some simple calculations: a = 6G m = 200 lbs ; F = 5339 N m = 180 lbs ; F = 4805 N m = 160 lbs ; F = 4271 N m = 140 lbs ; F = 3737 N m = 120 lbs ; F = 3203 N m = 100 lbs ; F = 2669 N ____ a = 8G m = 200 lbs ; F = 7119 N m = 180 lbs ; F = 6407 N m = 160 lbs ; F = 5695 N m = 140 lbs ; F = 4983 N m = 120 lbs ; F = 4271 N m = 100 lbs ; F = 3559 N ____ a = 10G m = 200 lbs ; F = 8899N m = 180 lbs ; F = 8009N m = 160 lbs ; F = 7119N m = 140 lbs ; F = 6229N m = 120 lbs ; F = 5339N m = 100 lbs ; F = 4449N ____ a = 12G m = 200 lbs ; F = 10679N m = 180 lbs ; F = 9611N m = 160 lbs ; F = 8543N m = 140 lbs ; F = 7475N m = 120 lbs ; F = 6407N m = 100 lbs ; F = 5339N As you can see, the forces are all over and because of that shock absorbing risers would have to be rated for very limited weights. Shock absorbing riser rated at 5339 N would tear for 100 lbs jumper at 12G and for 200 lbs jumper at only 6G. The important data points are around how many Gs does hard opening vs normal canopy operation put on the risers.
  14. I've been thinking of simple riser design to absorb some of the hard opening energy. In a similar way that crumple zones work in the car. Those zones could be for example: 7G, 7.5G, 8G, 8.5G, 9G, 9.5G, 10G etc. Below is my simple prototype, in real world, using modern technology, those zones could be integrated into the riser (webbing) itself. I believe professional name for that is tear webbing or shock absorbing webbing. Disadvantages? crumple zones could break unevenly which would result in uneven lengths of risers crumple zones could break when not desired, for example during high performance low turn after hard opening crumple zones would leave jumper with extra long risers which, depending on design, might not be landable anymore and may require cutaway crumple zones will have tolerance that will change over time; ones that initially were designed to tear at 7G after years may tear at 6G which could happen unexpectedly during high performance maneuver in order to operate properly, those risers would have to be rated for very limited body weights, e.g. 150-155 lbs only torn risers would have to be replaced which is extra cost for jumper Advantages crumple zones should not affect base riser strength crumple zones would absorb some of the hard opening energy risers with crumple zones should be very similar to regular risers and wouldn't require any other equipment modifications risers with crumple zones should behave exactly like regular risers in < 7G conditions; no extra flex should be observed risers with crumple zones could potentially be beneficial in fast spinning malfunctions as they would lengthen the risers making the spin slower What do you think? I think some other industries already use similar approach, e.g. Petzl ASAP`SORBER https://www.petzl.com/US/en/Professional/Mobile-fall-arresters/ASAP-SORBER _________ Assumptions hard opening that would require extra shock absorption is above 7G any regular canopy maneuvers are below 6G crumple zones should preferably be numerous and short, as short as possible ; that way if 1 zone tears at undesired moment, it shouldn't cause too much damage