Hi Erik,
The rocket I'm building does have a transition like you metntioned (
4" dia airframe to a 6" diameter "hipped booster"). I looked at the 2D flight profile and set the wind to 20 MPH, and the rocket weathercocked a lot. The static margin with all 7 motors is about 3.05 to 3.14, and so the rocket is overstable. I do not know how to do the CP calculations with pencil and paper, so do you have any other suggestions on determining the stability of the rocket? This is a problem I wasnt aware of so I am glad that you told me about this!Thanks alot,
Tom Sak
NAR# 82966