Re: bendy wings ?? how much bend is practical and what are advantages ? any of non ?
It will vary from design to design, but a rough guide I've heard is 1" of deflection per g. This number came from Orion, a professional aircraft designer who, sadly, is no longer with us.
The Pietenpol Sky Scout is far from the lightest aircraft in the world. Weights will vary some, but it has an empty weight of 250kg. Another plane of similar configuratin, the Fly Baby, has an empty weight of 274 kilograms. This gives a pretty general idea of where single seat wood and fabric...
Recall that the early Rutan Vari-EZ's had differential elevons on the canard for pitch/roll control. Burt Rutan later added ailerons to the wing after early builders reported poor roll authority. A cruciform tail could work, but run the numbers to see what the control authority is.
You should be able to figure out the stresses involved. Here's a link to some formulas for screw threads. I have some of this on my computer at work, but I don't have access to it right now.
Screw thread Calculations
I managed to track down one of the OP's threads on this concept on another forum. The configuration in that thread is one where there is a wide-chord rotor with propellers out near the tips. The rotor is rotated by the propellers. I saw no mention of the control system, but all of the OP's posts...
I usually stay out of this sort of thing, but you're missing a critical concept of supersonic aerodynamics. Wave drag is a function of the distribution of the cross sectional area, not frontal area.
Volume Wave Drag