RCU Forums - Geared to Direct Drive

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JH313

09-23-2011 11:28 AM

Geared to Direct Drive

I have a quick question:
Can I take the geared drive off of my 400 sized electric motor. It is going to be reused from a soarstar to a smaller plane (called for a 380, but i didn't have one).
Also, would a 5x2.5 prop be too small. Is there any negative to a small prop on an electric (other than less performance)?
Thanks.

CGRetired

09-23-2011 03:47 PM

RE: Geared to Direct Drive

The motor will try to turn at it's KV rating. If the prop is "smaller", more than likely it will approach that RPM point better than a larger one. It won't exceed that RPM if that's what concerns you.

If the motor bolts on and the gears match, I can't see any downside to it.

CGr.

jimmyjames213

09-23-2011 03:56 PM

RE: Geared to Direct Drive

Quote:

ORIGINAL: JH313

I have a quick question:
Can I take the geared drive off of my 400 sized electric motor. It is going to be reused from a soarstar to a smaller plane (called for a 380, but i didn't have one).
Also, would a 5x2.5 prop be too small. Is there any negative to a small prop on an electric (other than less performance)?
Thanks.

if your plane calls for a 380 the 400 would work just fine, it is not much bigger.
compared to useing the 400 motor with no gear box, the 400 with a gear box will be much better

CGRetired

09-23-2011 05:35 PM

RE: Geared to Direct Drive

From what I read, after looking for information on this comparison, they basically are the same motor and, basically have the same specifications. As I said, if the "bolt pattern" and gears match up with the gearbox, then go ahead and use it.

CGr.

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