Hi Peter, thanks for the feedback.
I’m still tossing up whether to go the OAT route, on the one hand as you’ve correctly said the inertia of the motor bell and prop is reduced at this scale, but the total aircraft inertia also scales down by a similar proportion.
Interesting point on gyro saturation; you’re right that no movement of the props = no gyroscopic force. I don’t expect that to be a problem though because the gyroscopic torque will just be in addition to the tilt-rotor torque and not a replacement of that torque.
All speculation of course and I could always do some calculations and modelling but building one to test would be more fun 