RE: Best Prop
I'd say which ever 6" pitched prop that will allow the engine to spin within it's max power range. 9-6, 8-6??
Gotta think of pedaling a 10 speed bike and picking just one gear to stay in. Do you wish to acelerate from 0 ? than a go with a 5 pitch
wanna have top end and have some kinda of assisted launch ? than go with a 7 or more pitch.
Here in Q-40 land , you take a 7.5 inch prop with a 8 pitch, add 23,000RPM and stir around the pylons for 180 MPH's
Mmmmmmmmmm... Q-40