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Old Apr 07, 2013, 05:46 PM
Cheif Bottlewasher
more coffee's Avatar
Canada, NS, Sydney Mines
Joined Sep 2005
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Belt Drive with an outrunner.

I was sitting around looking over some timing pulleys and belt ,,when it dawned on me ,, why don't I just use the body of the outrunners my bigger pulley, or ..depending on the who it's the smaller one..

Anybody ever come across this?

It cant wander ,,it will just track of the pully.. make alignment a breeze.
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Old Apr 07, 2013, 06:46 PM
AndyKunz's Avatar
Illinois
Joined Sep 2001
22,295 Posts
The belt drives we used in airplanes are toothed belts with "gear" pulleys. Nothing is smooth - it would slip too badly.

They're more like timing belts in your rice burner.

Andy
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Old Apr 08, 2013, 04:48 AM
NeverAgainVolunteerYourse lf
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Australia, QLD, Regents Park
Joined Mar 2007
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It should work as long as the motor can is perfectly parallel with the timing pulley, if it isn't the belt will track to the edge of the pulley flange and quickly wear though. As the diameter of the out-runner can is quite large an even bigger pulley would be required unless a speed increase is needed?

It will need belt tension as well, the supposed advantage of a toothed belt is that minimal tension is normally needed as opposed to V or round belts.

Nick
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Old Apr 08, 2013, 07:44 PM
Cheif Bottlewasher
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Canada, NS, Sydney Mines
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I thought it might work , wonder how the bearing loads would be

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Old Apr 09, 2013, 12:32 AM
Submarines, etc.
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Arvada, Colorado
Joined May 2005
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since the can is only mounted to the shaft at one end, and free floating at the other, i would think that any tension on the can would cause the magnets to grind into the wiring.
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Old Apr 09, 2013, 07:36 AM
Registered User
Wallingford, Ct
Joined Sep 2001
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Are the bearings up to the side load? Time will tell. It is worth a try.
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Old Apr 09, 2013, 09:56 AM
AndyKunz's Avatar
Illinois
Joined Sep 2001
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What the C/L Stunt guys do is add a bearing and former to support the far end of the shaft (they use the firewall as right behind the spinner, at the prop end, to minimize damage from precession).

Andy
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Old Apr 09, 2013, 06:45 PM
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Wallingford, Ct
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I suppose they get away with it, but more than two separated bearings on the same shaft is not considered good practice. I guess things work well enough and long enough on our scale.
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Old Apr 09, 2013, 07:42 PM
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Illinois
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They only have 2 bearings supporting the shaft, the other is supporting the can against the shaft.

Andy
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Old Apr 11, 2013, 05:55 AM
Registered User
Norwich, England
Joined Mar 2001
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See here:

http://www.castlecreations.com/produ...unt_setup.html
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