i assume bringing the CG as far back as possible would be the optimal design for a rocket, such as a bottlerocket. something finless, relying on the weight of a stick for stability...what role does the CP figure play in a finless rocket of this design? is it simply overcome by the rearward weight of the CG? are these rockets never truly "stable" in all aspects, resulting in less than predictable flights? if i were to build a large HPR bottle rocket, as seen on the discovery channel coverage of LDRS, what method would i use to ensure the vehicle is going to fly as reliably straight as rockets with fins at their bases? obviously, a standard 3FNC rocket is succeptable to any number of anomolies due to weather or equipment, like rod whip, or a stiff breeze leading to a weathercock...but beyond those variables, are there any more variables which would contribute to a "bottle rocket" design being any less stable overall?