First post so I will start off with a bang (err CATO?) and throw out a serious question or two. What construction techniques and materials are required for various levels of performance? If one wants to shoot for mach 1 (or 2 or 3) what materials are required to assure sound flight? For the purposes of this question assume minimum diameter rockets in the H to J range. I am trying to understand what materials and methods are required at certain G loads and Mach numbers.