Tip to Tip Carbon or Not?
I am currently building a 3" diameter 5' tall rocket with a 54mm MMT. The body tubes are cardboard mailing tubes laid up with 2 layers of about 5 oz carbon cloth. The fins were laid up with 3 layers of unidirectional carbon and are extremely stiff. I cannot bend them at all with my hands. These fins are not going to flex in flight. The fins will be mounted through the wall. I'm trying to design this rocket to withstand the most powerful 54mm motor there is.
Now, I'm thinking of laying a sheet of carbon just up to the inside diameter of the body tube rather than all the way to the tips of the fins. My thinking is that I just need a good solid fin to MMT joint. If the fins weren't stiff enough then the tip to tip carbon lay-up would be necessary. Or will chopped carbon in the filets be sufficient?
What are your thoughts on this?
Thanks a lot,
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