Estes Boosted Bertha #001946 Build, Part 7, Booster Fin Gluing

TIP: Mark the back end corner of the fins so you can easily see it when set up even with the end of the body tube.








The booster fin slots were a little tight. This might be because I fill the fins before gluing, that will increase the thickness slightly.

The slots were widened using a flat diamond file.




The instructions might show glue on the sides of the fins where the fin will contact the body tube slots.

For now, just apply glue to the fin tab and root edges. Do the fin side fillets later, it just keeps things clean.


Here's the booster fins and motor mount in place. Glue fillets have been applied and smoothed on all sides.

TIP: To get a four finned rocket to stand straight without wobbling - Adjust the fourth fin as it is being glued on.
Glue three fins in position and let dry. Slide the fourth fin up or down slightly in the slot (or on the pencil line) until all four fins sit flat on a table top.