Quote:
Originally Posted by crwilli
I have to ask where it gets its lift from? Weird to watch a 'copter fly with its propellers barely moving.
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That's a camera effect. The helicopter, full scale or model, generates lift from the blade tips. They are actually spinning at least 1200 rpms for a scale model like that and up to 3500 rpms for the 3D stunt helis that are more popular today. Which puts the blade "tips" at travelling very fast, to the tune of between 200 to over
300 mph, depending on the rotor speed. As the diameter increases, or the speed of the main rotor, so does the blade "tip speed". Multi blade helicopters require less main rotor rpm's since there are more blades and full scale helicopters have very "large" diameter blades, so at much lower rpm than models, the blade tips are still traveling very fast.