Frank van der Hulst wrote:
/snip/
Prop blade pitch control... a motor in the spinner to adjust pitch,
controlled via Bluetooth. No hollow crankshafts and oil pressure
systems, no slip-rings.

Frank

Eh? How would the motor be powered, batteries? I'm not sure how long
reasonably sized batteries would work. And what about centrifugal force
issues?...

Happy Flying!
Scott Skylane