skydiver8282 0 #1 March 31, 2005 I just bought a new Mirage M6. I also bought a new Sabre2 210, but won't be here until June. Anyway I have a old Skymaster 230 that I have been jumping and is the canopy that I will jump with container. It is a very tight pack job. I can get it in the bag with minimal effort and close the container with more effort. The closing pin releases with ease, but the bag stays in the container when I lift on the bridal. Will this be a problem in freefall? Quote Share this post Link to post Share on other sites
GravityGirl 0 #2 March 31, 2005 Nobody can say, "No, it won't be a problem." But you may want to find out how much pull force your PC produces and then do your test with that amount of pull force on the ground. Get a rigger to help you with this. You may be missing a few variables. ~~~~~~~~~~~~~~~~~ Peace and Blue Skies! Bonnie ==>Gravity Gear! Quote Share this post Link to post Share on other sites
nicknitro71 0 #3 March 31, 2005 QuoteBut you may want to find out how much pull force your PC produces and then do your test with that amount of pull force on the ground At terminal velocity a 28" shoud give you about 160 LBS and a 32" about 211 LBS.Memento Audere Semper 903 Quote Share this post Link to post Share on other sites
isaiah85 0 #4 March 31, 2005 Hey, Here is something that might help do the math. Your pilot chute should produce 7-10 G's later, Isaiah Quote Share this post Link to post Share on other sites
nicknitro71 0 #5 March 31, 2005 The formula he is using is wrong. He is taking the radius of the PC = 1.25' and multiply its square by pi = ~4.91 sq' and multiplying it by 0.7. That is wrong because he does not take into consideration the construction of the PC, the type of fabric, the fabric to mash ratio, and the length of the internal line. Overall it's an approximation on the safe side...Memento Audere Semper 903 Quote Share this post Link to post Share on other sites
FrogNog 1 #6 March 31, 2005 When you set the rig on the floor/ground, take the PC out, and pull on the bridle, the pin pulls and then what happens when you pull more? Does the entire rig lift off of the floor? Or does the bag come out of the rig before the rig comes completely off the floor? Not that this is any sort of "official, guaranteed, no problem!" test. This is just a simple test that has been used for similar issues before (I think for pin stickiness) so it gives a benchmark. -=-=-=-=- Pull. Quote Share this post Link to post Share on other sites
skydiver8282 0 #7 March 31, 2005 The pin comes out with no problems, the container lifts off the floor at the point the bag is suppose to come out. Quote Share this post Link to post Share on other sites
Martini 0 #8 April 1, 2005 Have a rigger look at it.Sometimes you eat the bear.............. Quote Share this post Link to post Share on other sites
pilotdave 0 #9 April 1, 2005 QuoteThat is wrong because he does not take into consideration the construction of the PC, the type of fabric, the fabric to mash ratio, and the length of the internal line. Obviously it's only an approximation, using 0.7 as an average drag coefficient of a pilot chute. A quick google search shows that 0.7 is a typical drag ratio for a flat circular parachute. Pilot chutes range from 0.4 to 1.0. That makes 0.7 a pretty good average, if you trust the internet. You can redo all the math at 0.4 if you want to be more conservative. Dave Quote Share this post Link to post Share on other sites
nicknitro71 0 #10 April 1, 2005 I see your point and again the approximation is on the safe side. PCs are much more efficent in producing drag than a round canopy thanks to their construction. I have empirical data from different sizes PCs all z-po and thier pull force is much higher than what is given by the equation.Memento Audere Semper 903 Quote Share this post Link to post Share on other sites
