Can't test stopped rotor that way. If both rotors are 'free', that mean you just spin up the motor stick. If you are stopping the only 'free' rotor, nothing spins. You have to stop the rotor against something external and fixed.
Hmmm, maybe that's the real telling argument. Helicopter is making enough lift at a slower unwind rate, but ONLY because of external blockage, even if no vertical support.
Jeff Anderson
Livonia, MI
--- In Indoor_Construction_at_yahoogroups.com, "ray_harlan" <rbharlan@...> wrote:
>
<SNIP>
>
> An easy way to test this hypothesis might be to put a weight, several times heavier than the helicopter plus motor on an electronic scale and tie a string to it and the helicopter. Wind up the motor and put it on the model. Let it "fly" and see what the change in weight is on the scale. Then stop the top rotor by putting a straight pin in the prop hook and let it jamb against the motorstick. Then see what the change in weight is, for the same motor torque. The tether might help to stabilize the model.
>
> Ray
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<SNIP>
Received on Fri Apr 01 2011 - 04:01:27 CEST
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