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mrputz1 04-30-2014 12:00 AM

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 ?

fhhuber 04-30-2014 12:20 AM

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.

stevecooper 04-30-2014 12:22 AM

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,,,
bubusteve

mrputz1 04-30-2014 12:33 AM

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 ?

fhhuber 04-30-2014 12:58 AM

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.

solentlife 04-30-2014 07:44 AM

Quote:

Originally Posted by mrputz1 (Post 946892)
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.

Nigel

Abuelo 04-30-2014 05:04 PM

Quote:

Originally Posted by mrputz1 (Post 946892)
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.

solentlife 04-30-2014 05:30 PM

Quote:

Originally Posted by Abuelo (Post 946953)
.........
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 !!

Nigel

fhhuber 04-30-2014 05:36 PM

Rubber bands do work.

solentlife 04-30-2014 06:35 PM

Quote:

Originally Posted by fhhuber (Post 946956)
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 !!

Nigel


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