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Electric Stunt => Gettin all AMP'ed up! => Topic started by: Harold Brewer on May 31, 2013, 05:20:08 AM
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Finally got my electric super clown ready to go. Last thing to do is mount and tighten the prop. I'm having problems getting the prop nut tight; no way to keep the motor from turning while I'm wrenching the prop nut. Need some ideas.
HB~>
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Harold I've found that if you can just hold the can and tighten the prop. if you are using a pusher prop. it will stay on. the prop does not have to be torq down as much as a IC. y1
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Is it a collet-style prop adapter? On my RC planes I've always been able to finger-tighten the nut, then hold the prop to finish tightening.
(And as mentioned, you don't have to get it nearly as tight as a slime engine: note that most electric prop adapters are all aluminum including the nut).
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I've tried holding the can (motor), but there is not much room given the
mounting. It just doesn't seem tight enough. Perhaps a spanner wrench to hold the back of the motor (is one available?).
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Did you have the right collet for the motor? Shaft is in mm. And make sure you push all the way back.
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I have also run into this problem, especially when using a prop adapter that has a smooth face where it touches the back of the prop....or when using a spinner with a smooth aluminum backplate. What I have done is cut some small washers out of 220 grit sandpaper to place between the slick surfaces. That usually gives me enough friction that I am able to tighten the prop nut sufficiently.
Bob
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Bob beat me to it. That's what I also do. Small washer out of sandpaper.
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Hi All,
Same here, but I make mine out of two pieces of sandpaper glued back-to-back if none of the surfaces is knurled.
take care,
Dean
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Sandpaper didn't do the trick on mine, although I didn't think of the back-to-back technique. I resorted to CA.
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I tried filing flats at the very front of the prop adapter, ahead of where the prop nut rests. Put a small wrench on that to hold the adapter while tightening the nut.
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The AXI prop adapters seem to be soft aluminum and not much surface area to grab a metal spinner backplate. I used a small ring of 100 grit sandpaper fastened to the motor with 3-M spray adhesive. The rough side faces the spinner backplate.
Floyd
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if you are using a pusher prop. it will stay on. the prop does not have to be torque down as much as a IC.
Don't agree with that one - if it's a pusher then the direction of rotation is trying to loosen the nut off. If it does get loose it will spin off in about 5 milliseconds. (Don't ask me how I found out.) I also found that the soft aluminum collet has a hard time gripping the polished chrome shaft unless it's good and tight. I'll try the sandpaper washer - it sounds like that'll do the trick.
Paul
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I tried filing flats at the very front of the prop adapter, ahead of where the prop nut rests. Put a small wrench on that to hold the adapter while tightening the nut.
Thanks, Dennis. That worked great. Now I can get the prop tight and also keep the spinner backplate holes aligned with the prop.
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On an IC engine I resorted to J-B Weld to glue the prop extension to the thrust washer on the engine. Might try J-B Weld to hold the prop adapter.