I started a thread a week back on the Astron Farside X, and I've been thinking of making my own, but different than the original, I'm a bit of an altitude junkie and I'm thinking of up-scaling it to take Estes' new E12's and E9's. Thankfully, I believe this is within the NAR rules, so my idea is proceeding. Now, I've never done a scratch build, but, summer is coming up and I've gotta build this since I'll have from the end of May till the beginning of September to do so, and as usual, I have questions.
First one: since jumping up from standard engines to E's which are an inch longer and also larger in diameter, the original BT50 will be too small, I was wondering if BT52 would work while having the engine mount inside?
Second: I'm going out on a limb and assuming that since the root length of the fins will extend an inch, there is a ratio between the new and old fin size should that apply to all sides?
Third: With ratios, the original body to payload had a ratio too, could this just be found by comparing the booster stages to the body length and then to the payload?
Fourth: back when I built the interceptor E, there was an orange adapter so that it could run off of C11's and D's. Any ideas of how to make all three stages take one but keep it inside the engine mount?
thanks for any help, there may be a few more I've forgotten and may post later.