Fixing a warped fin (already on a rocket)

any ideas on how to fix this fin on my Minnie Magg without cutting it off and replacing it???

Plywood? G-10 fiberglass? Attached with what sort of adhesive, and what is the fillet material? Need to know what it can take, to know what to advise! Details matter!

Gerald

its plywood attached and "fillited" with 15min epoxy.

Heat, then clamp and let cool.

ok, so plan is to hit it with a heat gun then clamp between two pieces of 5/4 X 4 and leave it for what, a week? more? I don't have a scheduled launch for some time so I can leave it for quite a while.

Maybe depends how far you want to go with it...but my initial reaction when reading the post was - moisture, heat and pressure. It would require sanding the fin and repainting. I was asleep that day in physics, but it seems to me that the fin will tend to spring back to the warped position by just clamping and releasing... Though there is probably some math to determine a perfect pressure and/or heat.

If nobody said anything to me - I would sand the paint off, mist it pretty heavy, heat and clamp....maybe repeating every day???? Right or wrong that would have been my plan.

I would leave it alone, fooling around with it could make it worse. It will fly just fine. I have a NC Big Brute with several fins that look worse than that. It was assembled with perfectly straight fins, but over time they have warped. It is stored in a temp., humidity controlled area, still warped. It flies straight as an arrow.

That would be my first question, how straight does it fly? If it flies straight without a lot of coning and minimal spin, then fixing that is probably trying to fix a problem that doesn't really exist. It would be purely for aesthetics and could make the flight profile worse rather than better.

There are times when it flies laser straight and other times when it’s touchy.

Not sure if the fin is responsible or the cp/cg

I am thinking I’m going to add 1.5 - 2oz of nose weight and try that. The CP/CG of the Minnie Magg is close, however I have read that base drag plays into the equation quite a bit with the large diameter to shot length ratio.