Once the rings for the motor mount are set, and the thrust ring is installed, the motor mount and fins can be assembled.

Again, I added blue masking tape to the fins to I wouldn't transfer epoxy from the glue joint onto the aesthetics of the fins.

The launch lugs were epoxied into place with the same protections.

Oh yeah, I scuffed up each of the plastic surfaces with 180 grit sandpaper before epoxying it.

No fillets are needed, since it is through-wall assembly and the fins should be held firmly to the motor mount and the internal plastic rings. Those rings act as internal alignment guides too, so they come out 120 degrees apart with no problem.

Attached Thumbnails