Original Posted By: owner-pietenpol-list-server(at)matronics.com
Fisherman,Do not forget the clearance for the prop is with FLAT TYRES and BROKEN SHOCKCORDS with the tail up high and the longerons level.I do think that the 78" diameter is the best size for the prop but nobodyelse believes me. The disc on a 78 inch prop has 17% more area than a 72inch prop. That translates to quite a bit more thrust.A helicopter can go straight up with under 100 HP and two people on boardbecause the thrust of a big diameter slow turning prop produces gobs morethrust than a small diameter prop turning a million RPM.Slow it down!! Make it big!!Chris Bobka-----Original Message-----