Does a rocket have to be built differently to accomodate a hybrid rocket motor ?
Yes. Generally, a rocket built to accomodate a hybrid rocket motor will need to have a longer motor section, sometimes 2-3 times the length of a comparable solid motor section. Additionally, hybrid rocket motors tend to be lower thrust, longer burn motors than equivalent solid rocket motors. This neccessitates building rocket airframes lighter and with careful thought to payload and recovery system placement to account for the shift of mass during flight as the oxidiser in the oxidiser tank is used up.
