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Upgrade NowThanks to both for the information and yes, purchasing that fiberglass Red Max is very tempting! Yes mine does have through the wall fins but I only used wood glue on the inside. I also had to modify em because I went up to a 38mm motor tube. I tried to get them tight tho, (to butt up to the motor mount tube). After the first break I used epoxy clay fillets and still popping fins
Here's what happened - You made the design heavier, and the fin joints can't take the strain of landing. To fix this correctly you must rebuild. No doubt about it.
Get the x-acto and start cutting.
Let's save the nose and lots of the "un-kinked airframe".
Motor retention and rail guides can be saved.
Fins can probably be saved.
I want to cut-up that fin can and see why the root pulled away from the motor tube. - My guess is poor bonding of the fin root to the motor tube and little or no INNER filets between the fin and the INSIDE of the airframe. It doesn't really matter if you used wood glue or epoxy. (lots of folks might disagree - that's ok) When bonding paper and wood, a correctly bonded joint will be stronger than the surrounding materials regardless of the type of glue used. (really) (except epoxy clay - don't use epoxy clay for anything)
Go to the hardware store. Get some Titebond wood glue or some 2-part epoxy. The epoxy you want comes in 2 separate bottles, not a plunger-syringe thing. You can use JB Weld for the retainer, but it's really too expensive to build the whole rocket with.
Let's rebuild this with an Ebay so it splits in the middle.
Fine print - By making a mid-break design - you greatly reduce the landing stress on those fins - this is the whole key right here and the reason why you must rebuild.
If you are using LOC airframe - consider buying a LOC ebay kit - it makes things much easier.
When building the new lower (fin can) section. Rough-up all the areas to be bonded so the glue can soak in. Every fin gets six filets. Bonus points if you can get the top and bottom centering rings glued to the fins.
I always recommend keeping the build as light as possible.
Have fun!!!
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