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Model Forum / Radio Controlled / Air Models / April 2007Pusher Propeller
Is it necessary to purchase a pusher propeller or is it satisfactory to just put a regular prop on backwards ? ( To be used on a WINGO.) | Is it necessary to purchase a pusher propeller or is it satisfactory | to just put a regular prop on backwards ? | ( To be used on a WINGO.) If you can reverse the motor, then it's satisfactory to just put a regular prop on backwards. If you can't reverse the motor, then you need to get a pusher prop -- and put it on backwards. In the case of the Wingo, the motor is probably already reversed for you, so a normal prop is probably fine. If the motor has neutral timing (which is likely, just being a cheap can motor) then if it does need to be reversed, just reversing the wires will be sufficient.  SignatureDoug McLaren, dougmc@frenzied.us "Things should be made as simple as possible, but not any simpler." -- Albert Einstein > | Is it necessary to purchase a pusher propeller or is it satisfactory > | to just put a regular prop on backwards ? [quoted text clipped - 10 lines] > timing (which is likely, just being a cheap can motor) then if it does > need to be reversed, just reversing the wires will be sufficient. Check the prop nut more often than 'normal' if you reverse the motor rotation -- front-winding motors tend to tighten the nut a bit, reversed ones tend to back it off a bit. Or just check the prop nut before you fly, every time. It's what I do, and the propeller only falls off in really bad crashes. SignatureTim Wescott Wescott Design Services http://www.wescottdesign.com Posting from Google? See http://cfaj.freeshell.org/google/ Do you need to implement control loops in software? "Applied Control Theory for Embedded Systems" gives you just what it says. See details at http://www.wescottdesign.com/actfes/actfes.html > Is it necessary to purchase a pusher propeller or is it satisfactory > to just put a regular prop on backwards ? > ( To be used on a WINGO.) Reverse the prop and reverse the connections to the motor: If a brushless only reverse two..its hard to 'reverse three' if uou think about it :-) Best appraoch is to check the geometry of the prop as it rotates and compare it to a regular puller/tractor setup. If you can reverse the engine or motor (depending upon whether it's an IC or electric), then a regular prop is good enough. Of course, it winds up being mounted backwards to that the leading edge is facing the direction of flight. If you can't reverse the motor, then you need a pusher prop and that gets mounted in a "normal" manner -- again, the leading edge is facing the direction of flight. A bad setup is where the trailing edge of the prop is now the effective leading edge -- it becomes a high-speed meat slicer. > A bad setup is where the trailing edge of the prop is now the > effective leading edge -- it becomes a high-speed meat slicer. And a very poor thrust-generator. Dan |
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