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Propellers, what is the max number of blades?
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4
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Re: Propellers, what is the max number of blades?
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by desertratjack on Wed Dec 24th, 2003 at 10:22:14 PM MST
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You have located the place where art and science mix. I believe there is a point where blade number controls the rpm but I don't know where this is (1000 blades?). 100000? Currently I run 6 blade and 3 blade mills. Thin high aspect blades with optimal helical pitch turn very fast in 6' diameter mills (probably near 2000 rpm in 35 mph breeze (the permanent magnet alternators characteristics matter too). Great fun to experiment with! Mostly, I deal with 20 to 50 mph here in the canyon. Two of my mills tilt back beginning at 30 mph or so and are able to take 60 mph (they look and sound like monsters at these higher wind speeds. The other two use 6 blades and do not tilt back and I am experimenting with them above 40 mph. One of these mills was on a 1 1/2 " pipe threaded into a 2" union with a 5' lever arm to the guy point. It broke through the threads at about 45 mph. I never found two of the blades! The present lever arm is 2 feet with 1 1/2" pipe and I think it will hold to 50 mph and more. 80 mph is a big difference from 50 so take it slow and make it strong :-) I've resigned myself to furling/feathering/tip back or swing out of the wind mechanisms for these higher speeds but I don't like wasting those winds. If I can be of help
jacknl7s@hotmail.com
Propellers, what is the max number of blades?
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4
comments (4 topical, 0 editorial)
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