That is a good point, me and The EGE have started quite a few threads about machbusters, but we never mention what meterials we use. For my 18mm machbuster#1 I used a swept double delta fin shape with 1/8 balsa that was laminated with paper skins and was soaked thoughly in CyA I used a estes body tube with a standard apogee parabolic nose cone, my second machbuster which I am putting more money into, will use thin G10 fins (I changed my mind again) and is useing a fiberglass tube from USR (they have a shaky reputation but they do have a 18mm fiberglass tube) Should USR maintain it's reputation**cough I will use the standard estes tubing, the fin shape this time is a cliped double delta with a reducing stake at the end.
Ok here is the short version: Balsa and Basswood are ideal for 18mm machbusters and 24mm machbusters because the largest engines of those class the D21 and the F32 can bearly go past Mach, regular estes tubing is good for Mach flights, with 29mm machbusters there are more options the largest SU motor being the G80, but the largest AT motor being the I200, Bluetube is ideal for these flights, you can use G10 here, but it is overkill, nose cone meterial for all machbusters should be hard balsa or a hollow fiberglass/plastic.
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I was told by someone that I live in isolated northern voids of the continental US