I've been having some problems using C11-3s in my Estes Vapor. Both times, there have been failures of the recovery system (18" nylon parachute). The first time, the shock cord made of an new kevlar material seemed to tangle up and snag the parachute, resulting in a crunched body tube (which was repairable). I replaced the shock cord with the kevlar I have been using for a while, and today the shock cord seemed to hang up on the parachute - the parachute itself wasn't tangled up and the lines weren't twisted/snarled up - resulting in a tail first dive which actually caused the motor mount to shove up into the body.

I simmed the C11-3 in Rocksim, and it looked like a suitable choice, but I am starting to wonder. It occurs to me that if the ejection charge in the C11-3 was weaker, and all that kevlar and elastic cord just wasn't being ejected out of the body tube forcefully enough, that could account for the crashes, especially in the long BT-60 tube of a Vapor. Does anyone know if there is a difference in the ejection charges in an C11-3 vs an D12-5 (which flew perfectly today)?