to Mike Hardy and Nick Lappos,
Thanks for quick reply, I might get addicted to this forum.
Nick,
The data I get from X-Plane appears to match with "poor rotor" on the chart you posted above. That means the data from X-plane is conservative.
Why do the rotor blades need to be light?
I saw a picture of a Djinn helicopter that was airfreighted to the Oshkosh airshow last week. The caption said the blades were so heavy the HV envelope was almost nonexistant. Is'nt that good?
slowrotor
p.s. the Djinn compressed air tip jet helicopter photo was on the aero news website last week
www.aeronews.net
edit note: the momentum formula used in this posting does not include rotor profile drag. So X-plane may closer than I thought.