Quote:
Originally Posted by Al Skierkiewicz
Alan,
I am thinking that any van door motor will be in the sub 100 RPM range and not easily adapted for use in a vacuum mechanism.
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That depends on if the gearing is within the motor or in a separate gearbox. Even if it is "integral" (like the window motors' gearboxes) there is nothing preventing them from running without the gearbox, usually, since there is a cap on the motor protecting the armature/commutator from the grease while also supporting the shaft. Since the rules didn't say whether or not the gearboxes of ARA motors would be considered part of the motor, but it did specify this for other motors, then removing the gearboxes from ARA motors might be legal. It might depend on how the automotive recycler sold it (if it is sold with the gearbox, the gearbox is part of it).
But that is all irrelevant. Since motors supply mechanical power instead of just speed, if they had a high powered van door motor it would be easy to gear it up to achieve a higher speed if necessary as long as the power needed is within the motors capabilities.
Seeing by the model plane reference, my first thought is a large, relatively slow, ducted fan. Either that or large, multi-bladed propellers which can move a lot of air at only a few thousand RPM, and still probably quite a bit at a few hundred.
Personally, if I were using Van door motors to generate a vacuum, I might just use a lead screw and a giant syringe.