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Old Mar 24, 2012, 03:05 PM
Registered User
Canada, BC, Kamloops
Joined Sep 2011
121 Posts
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Motor just became hard to turn with no throttle?

I just noticed my Stinson motor as soon as I cut throttle it stops right away. Also noticed it's hard to turn by hand. Other than that it runs fine. Doesn't get hot or have an odor when throttle is applied and seems to preform fine. Will it eventually seize? Anything I can do?
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Old Mar 24, 2012, 03:09 PM
I don't want to "Switch Now"
pmackenzie's Avatar
Toronto (Don Mills), Canada
Joined Dec 2002
16,757 Posts
It might be the ESC brake. It shorts out the windings to stop the motor.
Disconnect it from the ESC if you want to be sure.
Most ESCs can also be programmed to turn the brake on or off. Which ESC is it?

Pat MacKenzie
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Old Mar 24, 2012, 03:10 PM
An itch?. Scratch build.
eflightray's Avatar
South Wales U.K.
Joined Mar 2003
13,400 Posts
The 'Brake' is probably set on the ESC program.

It's normally used for folding props to ensure they stop windmilling and fold properly. When the brake is set, it's a bit like having a short across the motor, it's noticeable even with no battery connected.

Check the ESC's manual for how to turn off the brake.
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Old Mar 24, 2012, 03:52 PM
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Canada, BC, Kamloops
Joined Sep 2011
121 Posts
That's exactly what it was. Thanks alot guys
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Old Mar 24, 2012, 10:38 PM
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Joined May 2005
825 Posts
Even without folding props, braking the prop is often recommended if you want to stop the motor completely. A free-wheeling prop induces more drag than a braked prop, at least for props 9 or 10" in diameter or larger. That fact can improve your landings even. If you keep your motor turning (keep a touch of throttle on) you can bring some planes in a bit steeper and cleaner.
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