For this sort of tube one wouldn't need fibers at 45 degrees. The tube is not being used to transmit torsion - it isn't a driveshaft. The loads are axial compression, and bending and ovalization in response to bending. When a long thin tube is bent, it ovalizes - becoming narrower in the direction of applied bending load. This reduction of thickness of the tube reduces the stiffness of the tube against the bending load, and thereby acts as a stress concentrator.
Optimal for this sort of stress will be to have inner and outer layers of the tube using spread tow unicarbon with the fibers perpendicular to the long axis of the tube, with spread tow unicarbon oriented axially between these two layers. The outer layers with that orientation provide the greatest resistance to ovalization. If one were to zoom in to a small section of the tube, ovalization looks like bending a slightly curved plate in the direction perpendicular to the axis of the tube. So orienting the fibers to give maximum resistance to that load is appropriate.
The miniscule difference in radius from the center of the tube for the axial fibers vs outer surface makes almost no difference in the bending stiffness and strength.
Unfortunately having fibers perpendicular to the airflow on the outside might not make for the best failure mode in that regard.
Having fibers at angles not aligned with applied loads essentially wastes the mass of the fibers.
BTW, some posts previously, some mention was made of West Systems epoxy. West Systems has no use for a high performance rocket IMHO. It is the only system available (that I've encountered at least) which has a Tg (glass transition temperature) low enough that a sunny day softens the epoxy, and is also un-responsive to post-cure. It's good for glassing over wooden boats. That's what it's made for. For aerospace work, use an aerospace epoxy.
Gerald
Optimal for this sort of stress will be to have inner and outer layers of the tube using spread tow unicarbon with the fibers perpendicular to the long axis of the tube, with spread tow unicarbon oriented axially between these two layers. The outer layers with that orientation provide the greatest resistance to ovalization. If one were to zoom in to a small section of the tube, ovalization looks like bending a slightly curved plate in the direction perpendicular to the axis of the tube. So orienting the fibers to give maximum resistance to that load is appropriate.
The miniscule difference in radius from the center of the tube for the axial fibers vs outer surface makes almost no difference in the bending stiffness and strength.
Unfortunately having fibers perpendicular to the airflow on the outside might not make for the best failure mode in that regard.
Having fibers at angles not aligned with applied loads essentially wastes the mass of the fibers.
BTW, some posts previously, some mention was made of West Systems epoxy. West Systems has no use for a high performance rocket IMHO. It is the only system available (that I've encountered at least) which has a Tg (glass transition temperature) low enough that a sunny day softens the epoxy, and is also un-responsive to post-cure. It's good for glassing over wooden boats. That's what it's made for. For aerospace work, use an aerospace epoxy.
Gerald