A
Austin
Internal Fiberglassing: Adding strength to any high power rocket is always a plus, so I used the following technique to strengthen the area where the fins are glued to the motor mount tube. It is MUCH stronger than fillets, even though you still can add fillets after you apply this method. Glue your fins to the body tube following the manufacturer's directions. Cut some fiberglass cloth strips to the length of each fin and wide enough so it will lay across the motor mount tube about one inch, then up the inside fin and across the inside of the body tube about one inch. Mix some 15 minute epoxy and soak the cloth. Using a 1/2 wide stick, wrap the soaked cloth around the stick and insert the cloth into the area. The sitck is used to press the cloth down on all surfaces. Finally, Clean up any excess resin with denatured alcohol and repeat for the remaining fins. You will have a joint that is VERY strong, which is my first rule-of-thumb for High Power rocketry.