I've decided to use 1/16" (or 1/8"for larger models) kevlar for shock cords instead of elastic for my low power rockets.
My question is how long should the kevlar shock cord be?
We are talking about rockets in the 18" to two foot long range, flying on D through G motors (mainly 24mm, but maybe some lower impluse 29mm).
I've heard three times the body length, but this seems a bit short to allow air friction to slow the nose cone at ejection.
Thanks