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#9
March 8th 06, 02:00 AM
posted to rec.aviation.homebuilt
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Propellors vs Rotors
Can someone explain to me why 300HP applied to a large rotor
at ~700 RPM is enough to lift a 2000lb helicopter straight up, but the same 300HP applied to a smaller diameter propellor at ~2600 RPM can not even come close to allowing a 2000 LB airplane to climb vertically? Think of the airplane as a boat. Take a 30 foot boat and put in 300 hp motor and a 6" propellor. It will not move the boat much. But put on a 2 foot prop and low rpm and you will move the boat quite nicely. Air is like water. Colin 
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