I am not an engineer not even real dam smart.
A pipe is stiffer than a similar OD solid.
The pipe will resist deflection better, until it
fails, which willeads be catastrophic. The solid willike
bend much easier, but will take more effort to have a total
failure.
For use as a stock stiffener, a good tube will be stiffer, lighter,
and will not be exposed to the forces that would ruin it.
