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    Cypres 2

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    PCMN, Hilversum
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  1. Really? I have no problem harness turning a nav 240, rear riser pressure is even lighter than my crossfire. Front risers? Yeah there I agree, forget about those. But there's no need for those at 45 jumps. At those numbers you better work on survival skills like flat turns and avoiding traffic with your rears.
  2. If you really want to fix hard openings, the solution that makes the most sense to me is to control the slider speed. I'm convinced that a really hard opening is impossible if the slider goes down at a slow, controlled speed. If you can find a way to make it go down in a very controlled way, lets say constant speed in 3 seconds, I think you may have fixed the problem. In the current design, the slider is kept at the top end of the lines by air resistence, while it wants to come down due to the canopy wanting to spread out. Friction between the grommets and the lines also helps to keep the slider up, and once it starts moving, slows it down a bit. This is a very delicate balance, especially since friction is super unpredictable and changes depending on linetype, wear, dirt, and probably temperature, humidity etc. Once the balance dictates that the slider goes down, this happens at an almost uncontrolled speed since the friction is nearly independent on the speed of the gommets over the line So what happens, once the slider starts moving it moves without much control of its speed. Designers can offcourse affect the velocity at which the slider starts moving; controlling the speed is almost impossible. So what we need, is a reliable way to dampen the slider speed. Dry friction is not the perfect solution (altough very simple and cheap) because it is almost independent of speed; what we need is that the amount of friction depends on the velocity at which the slider moves over the lines. No friction at 0 speed, a lot of friction at high speed. This way you could make sure that the slider ALWAYS takes around 3 seconds to come down, at a constant speed. Problem solved! In theory at least...
  3. I think it happens a lot, I've known a lot of guys who were very active and made a lot of jumps in a short time, only to suddenly disappear and never be seen again at a dropzone. Others keep on going year after year. Me, I quickly stopped doing tandemvideo when someday I felt relieved that jumping was cancelled for the day due to the weather. It started to feel like a job, and I already have one of those! Went back to jumping just for the fun of it, and never regretted it. Maybe someday I'll change my mind again, maybe not.
  4. evh


    So maybe you should read Baksteen's posts two more times then ;-) He has a valid point. Roughly measured in Google Maps, border to border Sweden - Iceland : 1300 km Countries within that radius include: - Belgium - UK - Italy
  5. I agree. I tried doing the math, and fail to see how this solution would work. It sounds nice, as a concept, but there is no way I can make it work on paper. On a climbing harness this solution makes sense; a rope stretches maybe half a meter, adding 20 cm to that helps. But unlike a climbing rope that is anchored into a mountain, a canopy moves with the skydiver and simply excerts a force through the lines, which mainly depends on air speed. Unlike a climbing rope, the force is independent on distance travelled; it just depends on the speed. A canopy opening at 7G has a "braking distance" of about 26 meters (thats ~86 ft, ouch!) , adding a few inches to that is insignificant. Or is this too much of a simplification? If so, how should you calculate this?
  6. Who says coal is dead? It isn't and it won't be as long as a few rich russians are making a lot of money (while other russians are dying beacuse of it, but who cares, right, MAGA fuck yeah!) And if you don't like the black snow, you can aways paint it white.... brilliant solution!! https://www.themoscowtimes.com/2018/12/19/russian-authorities-cover-snow-white-paint-hide-sings-pollution-a63892 https://www.businessinsider.nl/snow-turns-back-siberia-russia-pollution-2019-2/
  7. By the way, these ladies do a great job explaining what I've seen happening too many times. I must admit I didn't always recognise it before I watched their talk.
  8. This. We ALL have had that problem. Boys are just better at acting like it didn't hurt ;-)
  9. Interesting development! Does it run on Oculus Go?
  10. "The bigger question to me is how many of them are going to visit Grandma at the nursing home." You would think that by now, everybody understands that THAT's exactly the point.....
  11. Like I said, your impression might be correct.
  12. OK this is a bit unexpected to me... I really hope this doesn't turn out to be a big misstake.
  13. Probably because carbonfibre is ridiculusly strong for its weight. So for the same strenght you get a lighter helmet, or for the same weight you can get a much stronger helmet. I'm not entirely sure that this translates to better protection tough, since strength is just one of the many material parameters that affect impact resistance.
  14. Last time I was in the tunnel, maybe half a year ago, I saw some instructors with those. They wear them a lot, and seem to like them better than a G3. They also look very well made, from a distance at least.
  15. "However, if you reversed the set-up and had the quick ejector strap attached to the plane, and attached it to somewhere on the harness, say the articulated hip ring, that might be more efficient" If by "quick ejector" you mean a large version of an RSL snap, than that's exactly what I see in a lot of planes in Europe (mostly C208's). And it works very well, without the need to modify a harness. I don't know the legal implications, but apparently it's not a problem here. Getting such seatbelts in our C182 on the other hand appears to be a big problem to the authorities, unfortunately.