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Old 04-30-2014, 12:00 AM   #1
mrputz1
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Default outrunner motors

Looking at small motors on ebay some have a hub on the output shaft with two large screws. What are they there for ?
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Old 04-30-2014, 12:20 AM   #2
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Generally these are small motors. The device on the output shaft (sometimes built into the motor case) is called a "prop saver" you use an O ring or rubber band to hold the prop on.
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Old 04-30-2014, 12:22 AM   #3
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thats where the prop is mounted, an "O" ring goes over the prop an holds it to the shaft,, their called prop-savers,, and they work well,, hope that helps,,,
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Old 04-30-2014, 12:33 AM   #4
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Default outrunner motors

Oh I get it now. I thought they all should have a prop hub and spinner .Wow does rubber bands hold a prop spinning at 1200 rpm ?
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Old 04-30-2014, 07:44 AM   #5
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Originally Posted by mrputz1 View Post
Oh I get it now. I thought they all should have a prop hub and spinner .Wow does rubber bands hold a prop spinning at 1200 rpm ?
It is no ordinary rubber band...... it looks same as an Oil O-ring in an engine.

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Old 04-30-2014, 05:04 PM   #6
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Originally Posted by mrputz1 View Post
Oh I get it now. I thought they all should have a prop hub and spinner .Wow does rubber bands hold a prop spinning at 1200 rpm ?
That 1200 rpm quoted might be the rpm per volt. If it shows as 1200kv on the specification sheet multiply it by the voltage, i.e. 2 cell lipo 7.4 volts times 1200 = 8880 rpm.

And yes, the prop saver works just fine.

The prop saver o-rings are cheap but sometimes hard to find. Latex tubing, used in medical procedures and what we use in the high-starts, also works. Just cut of rings from the end. I found some at Lowes back in the plumbing area.

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Old 04-30-2014, 05:30 PM   #7
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Originally Posted by Abuelo View Post
.........
The prop saver o-rings are cheap but sometimes hard to find. Latex tubing, used in medical procedures and what we use in the high-starts, also works. Just cut of rings from the end. I found some at Lowes back in the plumbing area.
Or trot along to local car accessory / parts shop and pick up O rings ... I buy them in packs of 10 for a couple cents each !!

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Old 04-30-2014, 12:58 AM   #8
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1200 rpm is actually pretty slow. Some of these small props can be held on with an o-ring or rubber band at over 10,000 rpm.
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Old 04-30-2014, 05:36 PM   #9
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Rubber bands do work.
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Old 04-30-2014, 06:35 PM   #10
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Originally Posted by fhhuber View Post
Rubber bands do work.
I was thinking in terms of flimsy office bands - you never know what people will take as meant by simple term like Rubber Band.

I would not like to think someone got injured by using such on a prop doing 8K .. 10K or more !!

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