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Old Jul 20, 2015, 09:24 PM
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Help!
Aluminum drive hub>aluminum spinner backplate

I have a question about using an aluminum spinner with an aluminum backplate, mounted on a Saito 125 which has an aluminum drive hub.

The engine drive hub is knurled to grip the propellor. Engine comes with a 2 piece locking jamb nut affair. I would assume this works as intended.

I am using the engine in a H9 Christen Eagle II. I have the optional aluminum spinner for the bird which obviously has an aluminum backplate that is completely smooth on the backside. I purchased the proper adapter kit to mount the spinner (single bolt through center) to the engines' crankshaft. The propellor locking order will be: knurled aluminum drive hub>spinner back plate (smooth backside, knurled front)>propellor> washer> big ass nut> threaded adapter post.

I think I read somewhere that one needs to pin the spinner backplate to the aluminum drive hub in order to have this WHOLE assembly from loosening up in the air. I guess I am afraid that the aluminum drive hub> aluminum spinner backplate will not get a good bite/union with each other and this setup will get thrown off the front of the plane when I don't need it to.

I've never used an aluminum spinner before,only plastic. Should I pin it?

Any real world experience is appreciated.
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Old Jul 20, 2015, 09:44 PM
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I've never had an issue of a smooth back plate slipping on a hub. If you are concerned about slippage, you could try a sandpaper disc with the paper against the hub and the sand against the back plate. I would think 120 to 150 grit would be about right.

Ken
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Old Jul 21, 2015, 05:50 AM
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You need to really tighten the "big ass nut" many people do not tighten enough.

But, if you still have slippage you can do as Ken suggests. But, a better material for this purpose is the drywall "sanding screen", which you can get anywhere they sell sanding products. The screen gives you "bite" on both sides.

Tom
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Old Jul 21, 2015, 07:01 AM
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What people also don't do is re tighten the wood props after a few flights,,

Good tools make a big difference also,,, use a real box end wrench, not the little open end things that come with the engines, I've never had an issue with back plates slipping.

good luck
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Old Jul 21, 2015, 07:41 AM
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Wood props will loosen, I never used them with glow.
As everyone said tighten the nut.
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Old Jul 21, 2015, 08:03 AM
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Thanks for the input Guys.

I have two drive hubs for this engine so I tried my luck at drilling one ( the cosmetically flawed hub). I have some really stiff .074" wire for the pin. Drilled a hole with the closest diameter bit which was .071 and the used my dremel to cut and smooth the ends of the little pin. Tapped the pin in after scuffing it up plus some drops of blue loc-tite.

Then drilled a .0925 hole in the backplate to allow for my inaccuracies.

All of this drilling and pinning is within the radius of the BAN so I have my fingers crossed that the balance will not be affected.

Thanks for the ideas as I have another Kyosho plane that needs assembling and will use a Kyosho spinner which consists of aluminum backplate>plastic spinner.
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Old Jul 21, 2015, 08:39 AM
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A disk of thin plywood between the
hub and spinner will give the grooves
in both something to bite into.

Jenny
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Old Jul 21, 2015, 07:03 PM
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Quote:
Originally Posted by tacx View Post
You need to really tighten the "big ass nut" many people do not tighten enough.

But, if you still have slippage you can do as Ken suggests. But, a better material for this purpose is the drywall "sanding screen", which you can get anywhere they sell sanding products. The screen gives you "bite" on both sides.

Tom
Drywall screen, MUCH better idea!!!!

Ken
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Old Jul 21, 2015, 07:07 PM
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I like the drywall screen idea too.
I will try that method of locking the drive hub to smooth backplate of the spinner with my nice/unmarked drive hub.
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Old Jul 21, 2015, 09:30 PM
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Anti-slip washer

A washer made from thin leather will never slip and is much stronger than sandpaper or drywall screen. I've even used these on G-62s without problems.
Just my 2c,
Jim
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Old Jul 21, 2015, 10:04 PM
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Thank you Jim
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Old Jul 22, 2015, 04:34 AM
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Quote:
Originally Posted by SRQFlyer View Post
A washer made from thin leather will never slip and is much stronger than sandpaper or drywall screen. I've even used these on G-62s without problems.
Just my 2c,
Jim
Great. I actually like it when I think
I have a good idea, and someone
tells me a better one. Leather is
so much easier to cut into a nice
circle than plywood.

Thanks

Jenny
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