boyczech 0 #1 April 29, 2012 I am looking for some help trying to figure out my fall rate under canopy and also how fast I am moving forward under canopy with 0 mph wind. I am 230 pounds with all my gear. I fly a 210 Saber2. I am interested in the math formula so I can figure this out while sitting on my sofa. I got lots of advice on using a stopwatch and an altimeter. Anyone got any information for me? Quote Share this post Link to post Share on other sites
likestojump 3 #2 April 29, 2012 Its sink rate ;) Time the descent from from 1K to landing. Divide. Quote Share this post Link to post Share on other sites
boyczech 0 #3 April 29, 2012 ok. Sink rate. got it. thanks. i am sitting in my house. so i am trying to figure it out by the math and not measuring a jump Quote Share this post Link to post Share on other sites
kd5xb 1 #4 April 30, 2012 I got a surplus rate of climb indicator and taped it to my main lift web once, a LONG time ago. Pretty interesting, getting off the step, there was a pause, and then the needle smoothly swung all the way as far toward "descent" as it would go. Seems like (from memory, 30+ years) it showed somewhere around 1,000 FPM descent under open canopy -- but the bad thing is that they were ROUNDS. Never tried it under a square.I'm a jumper. Even though I don't always have money for jumps, and may not ever own a rig again, I'll always be a jumper. Quote Share this post Link to post Share on other sites
kallend 2,027 #5 April 30, 2012 Quoteok. Sink rate. got it. thanks. i am sitting in my house. so i am trying to figure it out by the math and not measuring a jump Well, all you need are values for your lift and drag coefficients (you + lines + canopy) and you can do it all from your armchair. Good luck with that!... The only sure way to survive a canopy collision is not to have one. Quote Share this post Link to post Share on other sites
Abedy 0 #6 April 30, 2012 Quote I am 230 pounds with all my gear. I fly a 210 Saber2. Try this graph. The guy who recorded it flew a PD 210 and my guess is he weighed about 210 pounds (gear included) at that time. So regarding your weight you should be sinking a little faster but since the Sabre is a ZP canopy (with a different shape) and the PD 210 is F111 fabric, the Sabre should sink more slowly, so the effects should balance each other out, roughly estimated. But if ya apply yer brakes yer sinking waaayyyy more slowly, just to tell ya about other factors The sky is not the limit. The ground is. The Society of Skydiving Ducks Quote Share this post Link to post Share on other sites
