Cutting the fins from a sheet of 1/2” 9 ply Baltic birch.

All 4 of the fins were bolted together and sanded with a belt sander to ensure they are all symmetrical..

The first fin being tacked onto the 75mm phenolic motor mount tube.

Fin #2 tacked on.

And then fin #3.

10oz fiberglass added between the fins and across the motor tube to firm up the fins.

Cutting the fin slots on the booster body tube.

Test fitting the body tube

A few high spots and a little more trimming on the slots.

Alright, I finally have something that looks like a rocket. Making progress.

Parts is parts! Some assembly required!

All thread is ran through both centering rings and through the coupler to make the booster a zipperless design.

Applying epoxy to the coupler that will be glued into the top of the booster section.

External fillets made with epoxy and carbon fiber.

As a form of extra insurance, I’m foaming the fincan with US Composites 2lb foam.