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The wings would be stiffer if they joined just outboard of the prop tips. ... perhaps more like the twin-booms on the speculative Japanese sketches. Those (speculative) booms need to be stiff enough to prevent forward and aft wings from flexing up and down relative to each other.IOW a shorter load path will be stiffer.Reducing aero-elasticity would also reduce the prospects of prop blades clashing.We wonder if it is practical to join the two prop hubs with a ball-bearing ... to reduce relative motion.??????
The wings would be stiffer if they joined just outboard of the prop tips. ... perhaps more like the twin-booms on the speculative Japanese sketches. Those (speculative) booms need to be stiff enough to prevent forward and aft wings from flexing up and down relative to each other.
IOW a shorter load path will be stiffer.
Reducing aero-elasticity would also reduce the prospects of prop blades clashing.
We wonder if it is practical to join the two prop hubs with a ball-bearing ... to reduce relative motion.??????
