eggplant
L3 | NAR 93664, TRA 17791
- Joined
- Jan 5, 2011
- Messages
- 1,856
- Reaction score
- 776
I have a fairly large sheet of ripstop nylon (5'x4'). I would like to construct parachutes for two rockets out of it. One is 4" diameter by 4' tall. It weighs about 2 pounds without recovery, motor, and a couple things I am still working on like the altimeter sled. It has 0.2 inch thick fins that do not protrude below the body. The other one is a dual configuration 3" rocket. It varies from about 4.5' long and 2.5 pounds to about 7' and 4 pounds. This is of course without motor or recovery. The rocket has fins made from the same plywood (0.2), but they extend about 2" below the body tube. I think I may need a larger parachute for it. I fly at CMASS and MMMSClub. Both fields have fairly soft ground. I would not like to make more than two parachutes, and I would like everything to come down as quickly as safely possible. I have used many calculators and they all return different results. Do you have experience with similar rockets? What size/shape parachutes did you use with them?