Richard Sohn wrote:

I think I better not show that efficiency curve to my gyrocopter which
still flys on 40hp with a ducted fan, and that at 42mph. Its like with
the bee, as long as you dont tell him he can not fly, he will keep
flying.
BTW i am working to puting an air cooled single rotor with 60+hp in
it.
Richard.   unicorn@aic-fl.com

Richard, I would like to publish that picture you sent but you need to
crop it when you scan it in. 290K is too much to send out on the 
newsletter.

Well if its so great why do you need 60 HP? That thing would fly much
better if you raised the engine, took the duct off and put 
a PSRU and a proper prop on there.

40 HP at 40 MPH means there is a potential thrust of 375 pounds
assuming a 100% efficient prop. Your gyrocoptor ought to
fly stright up when you get a real good prop on there. Can it fly
stright up now at 40 MPH? :-) The bee can :-) 

Of course the bee  has the benifit of the reynolds number. 
He is not flying. He is swimming in molasses :-)

One HP is 550 pounds of force (or drag or thrust) moving 
at one foot per second.

HP X 550 = thrust times velocity

Thrust = (HP X 550) / velocity ....      with a 100% efficient prop.

BTW 40 MPH is 58.6 feet per second.

Paul Lamar
 
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