Prop Hole Way too big!!! - RCCanada - Canada Radio Controlled Hobby Forum
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Old 05-28-2005, 12:50 PM   #1
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Prop Hole Way too big!!!

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I have a Nippy 0808/98 motor which has a smooth 4mm shaft diameter. I had a slow-v prop on there before(11x4.5, but the recomended is a 9x4.7). I drilled out that prop and it was a very tight squeeze to get it on. But the new APC park flyer props come with like 6mm or 7mm holes already in them. How do I get it to fit my nippy motor? I thought maybe two small hot disks and squish the hole from both sides and then drill out a new one. But will this type of plastic go back to just as hard as it was before? Any suggestions would be great.


Mike M
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Old 05-28-2005, 04:34 PM   #2
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I'm not sure what plastic hot disks are. I have had a similar problem, and I filled the prop hole with epoxy and microballoons, let it harden, and then redrilled. JB weld might be a good choice, too. I just put a piece of tape on the bottom of the prop hub to keep the resin from leaking out. I also used my drill press to re-drill the hole to make sure it's square, but as long as your careful a hand drill should be OK.

My prop was mounted with a prop adapter, where the prop hub is sandwiched between a drive washer and a prop nut/washer. I'm not sure how this method would work if the prop is simply mounted directly to the motor shaft.
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Old 05-28-2005, 08:44 PM   #3
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Take a bit of fuel tubing snip off a piece, use as a bushing, and as you tighten will center and snug up your prop. I've used heat shrink with "some" sucess.
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Old 05-28-2005, 09:23 PM   #4
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Your apc slow flyer prop should have came with 2 inserts . Each one will press in . The smaller one should work .Measured it is 5mm id .The other one is 6mm.

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