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Steve Hix wrote:
In article .com, wrote: Bob Moore wrote: Reed Judd-Dyer wrote How does more blades equal less efficiency? Those of us that flew rubber band powered contest model aircraft way back ('40s-'50s) KNOW that the most efficient propellor has only ONE blade...and a counterweight on the other side. :-) Bob Moore A Helo with one blade would have to be the most uncomfortable ride, until after a minute or so, when it had shook itself to pieces. quite a bit less than a minute... The single-blade prop with counterweight actually worked pretty well in testing. AND if you look at the model planes that are used in the International U control speed contests, each has only one wing with fuel inside, powered by an engine with prop of one blade and counterweight, faster it goes more Cf on fuel in wing to input to engine, which has funnel type air inlet to carb. Really screams, and speeds of over 230 klm hour running in a 33meter radius circle about a heavy pivot in the center. Year I saw it at Westover, Mass the Aussie team won it by a healthy margin.. more than 3% faster than old record.. |
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