I decided I'll attempt air starting motors for my next rocket. A 29mm motor in the center would be ignited on the pad, and the two outboard canted motors would be air started.
I also wanted to do oblique nose cones. I couldn't find any for BT-60 tube, so I made some by rolling up paper and mounting it to a coupler. I smeared a dollop of 30 min epoxy mixed with phenolic micro balloons on the side, so I could sand a rounded tip and the nose cone would have some strength.
The central shock cord will be replaceable, so it runs through a small tube and loops around the end of the engine mount.
The canted motor mounts were tricky, plus I wanted to do through hole fins. It took some measuring, but mostly a lot of TLAR, but I got two canted mounts that are nice and symmetric.
I also wanted to do oblique nose cones. I couldn't find any for BT-60 tube, so I made some by rolling up paper and mounting it to a coupler. I smeared a dollop of 30 min epoxy mixed with phenolic micro balloons on the side, so I could sand a rounded tip and the nose cone would have some strength.
The central shock cord will be replaceable, so it runs through a small tube and loops around the end of the engine mount.
The canted motor mounts were tricky, plus I wanted to do through hole fins. It took some measuring, but mostly a lot of TLAR, but I got two canted mounts that are nice and symmetric.