I thought they were just a materials supplier.
Im having a forum member make me the fins but I want to know if they do custom work just in case if i need an extra pair. I already sent them an email but they havent replied yet (it's been several days).
I doubt if they will do cutting; not really their business. I thought you were asking for a special layup--either a sheet or a tube.
Oh. Could they also do boatails?
A one-off custom boattail might be pretty expensive. A few years ago I made a run of 1.5"-24mm fiberglass boattails. The making of a plug, then mold, then getting the layup right is very time consuming. You'd be looking at a $250 boattail regardless of size due to labor alone.
That takes care of the plug & mold, maybe. But there's a lot of labor there in finishing the mold, creating the part, and finishing the part.
Of course you can jump straight to a 3d printed boattail or NC, or turn one out of basswood, or whatever.
Wherever you do it yourself, plan for extra materials dollars. Wherever you have it done, plan for extra labor dollars.
The boatail's aft diameter is around 19 mm, length is 17mm, and fwd diameter is 24.8 mm. It is connected to a 24.8 mm diameter body tube.
Sounds like it would extend past the nozzle quite a bit, reducing your thrust a bunch. Not to mention the thrust ring from the aft closure that would prevent you from attaching ithe boattail to the airframe. The diameter of that thrust ring is ~28mm.
Carolina Composites makes a tapered aft closure for the CTI 24mm hardware that might be exactly what you're looking for. Not sure if that part would be legal for a CAR record attempt, though.
I am confused. Why would it reduce the thrust? It's not like the boatail is going to be in contact with the flame.
I am using a custom closure that is attached with the boatail and so the nozzle will not exactly be flush with the top of the boatail. Rather, it will be a couple mm ahead so that the flame will not come near to the boatail. And I think the closure itself will be legal, since I am not exactly modifying it in any way.
What about making the boatail and then dissolving the mold?