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We are using some older rockets as an example for the motor mount and fin design.  The two red rockets are from 2 and 3 years ago.  Notice the placement of the centering ring and the how the motor mount is positioned.  On the right are two rockets from last year.

There is a position relationship between the fins, the fin tabs, the motor mount, the fin slots and the centering rings.  They all need to come together in a dry-fit, before the big glue-up. You also need to attach the launch rail button before you try to glue everything together.

We will focus on four fin booster designs, because we have four fin holding gigs.  But shape and number of fins is not that important, as log as you have enough surface area to make it stable.

We will use 1/8in basswood or 3/32in plywood for the fins.  The fins will go through the body tubs and attach to the motor mount. It is most important to have the fin wood grain run along the forward edge of the fin.