um, nope.
If the tube is optimized for a perfect pressure vessel straight tube (lets ignore end domes for now) adding fins with fibers not optimized for a pressure vessel and not in the vector of the pressure loads would locally weaken the structure. You can compensate for that by adding thickness - doable but not without a weight and drag penalty.
Integrating tail cones and end domes also comes with a penalty. Hoop wraps (near 90 degree wraps) can not go down slopes like tail cones or end domes. Additional material needs to be added off axis to make up for that. Another problem is the fiber angles change as you go down a slope, again can be accounted for but everything has a price. If you look at most composite rocket motors there is usually a skirt attached over the ends with an increased OD. The hardest part of a composite pressure vessel is the transition from the cylinder into the domes. This is where we spent the most time designing, and typically where we would see a failure.
Other issues are how dynamic a pressure vessel is, they grow in length and diameter when loaded Things like fins and skirts can actually cause stress concentrations that result in local failures. All needs to be factored in.
Optimization is about dealing with what you have in the 'least bad ways' it is very difficult to have a structure, even one as simple as a pressure vessel, fully using the material properties everywhere. It is just a matter of how best can you make them work.
Not trying to complicated it, but simple to make it work, much harder to make it work at minimal weight / cost.
Mike (actual composite engineer) K
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