Hi Swimdude
My Wallis type Gyro G-CRKT has a .49 motor with a belt drive to a lay shaft to a pinion /crown wheel to a shaft with flex. boat couplings with a friction roller that rubs on a disc in the rota head, when full forward on pitch. A 15 to 1 ratio. Spins to 400 rpm when motor at 6000 rpm. Not flown yet but taxys and spins up well and shows great promise. The big problem is to stop lifting off before Autorotation, all my Gyros have this problem, hope this one cures it.