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#1
November 3rd 03, 06:53 AM
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This assumes you need to turn a 6 foot diameter propeller, which seems
pretty generous for the power. I calculate nearly 80 HP at about 3200 rpm, which is similar to the crankshaft speed of the Jabiru engines, so the 75 HP figure should be acheivable. Hopefully, any resonance problems have been dealt with by the engine or crankshaft manufacturer, and you are using the same propeller as they recommend. Peter Peter, the VW I'll be flying is on a Dragonfly, which is pretty low to the ground, and will only be swinging a 52" prop (one recommended by GPAS). Max RPM on the engine is 3600 (takeoff power), but you're correct that cruise RPM is 3200. Bob, I'll accept both your luck and your warning :-) Eric 
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