blackjack2564,
Great idea! My ONLY worry would be having the epoxy glue itself firmly to the packing tape and the packing tape stay firmly attached to the coupler. I like the idea of ... well, see what
3stoogesrocketry suggested.
3stoogesrocketry suggested:
On the inside of your bodytube , use one strip of 1/2 wide tape sticky side out per fin slot to seal the tube . Then slip your coupler back into your airframe.
I like the idea of sticky side towards body tube, but getting the tape in is easier said than done. You can't easily put the end of the tape on a stick and get it into the right place. I tried inserting it it with my big piano player's hands and bled on the body tube (Why didn't I go for 98mm?), but that's what grandkids are for.
And this shocker just in from rharshberger:
+1, and no epoxy I have found yet sticks to the stuff.
Holy cow, that's a game changer. I assume this includes JB Weld, so we can forget the aforementioned mold release compound.
All this is just a workaround for my usual method of wrapping waxed paper around a motor casing for the same purpose, but I've checked and while it may require a bit more sanding, I think I can get a half-inch width of packing tape to squeeze in beside the coupler.
I like loose couplers, anyway - when they need to slide apart in flight, they should do so easily. Holding the rocket together is what shear pins are for.
BTW, a note to 3stoogesrocketry:
I remove the motor casing (or, in this case, coupler) after cementing the fins in place with JB Weld. I then use Kitty Hair to build up a BIG honkin' fillet that can go a third or more the span of each fin.