- Joined
- Jan 19, 2019
- Messages
- 504
- Reaction score
- 64
Good evening. Today I ground tested my Big Nuke again. The drogue area I extend by 16” from the stock kit. It is a 5.38” diameter rocket. I now have 28.25” of usable space in the drogue area. After putting my blanket, drogue chute and a little dog barf in for good measure there was plenty of empty space left over. I watched it pop on 3.3 grams. That came to about 10 psi. It threw the av bay and main 9 feet which I thought was plenty especially for how heavy it is.
Then on the main test, I used 1.62 grams in 14.5” of usable space. It was about 9.5 psi. By the time I inserted a little dog barf, the deploy bag, 9’ Rocketman chute and shock cord there was NO extra space. It was even a little compressed. The 1.62 of powder didn’t even pop the nose cone! I had used three 2-56 sheer pins to hold it on. I learned something. It must actually take more psi to pop a full tube than one with lots of empty space, seems backwards unless it was actually the compression that caused more friction that got me?
Then on the main test, I used 1.62 grams in 14.5” of usable space. It was about 9.5 psi. By the time I inserted a little dog barf, the deploy bag, 9’ Rocketman chute and shock cord there was NO extra space. It was even a little compressed. The 1.62 of powder didn’t even pop the nose cone! I had used three 2-56 sheer pins to hold it on. I learned something. It must actually take more psi to pop a full tube than one with lots of empty space, seems backwards unless it was actually the compression that caused more friction that got me?