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Old 06-11-2018, 10:31 AM   #1 (permalink)
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Default Spool up without blades

It was said in another forum several years ago that you should NEVER spool up without your blades on. Whats everyones take on that. The guy said that it is possible you can burn out the motor because they are designed to have a load on them, however sometimes we need to do that to check things.

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Old 06-11-2018, 11:51 AM   #2 (permalink)
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Well you ~could~ do damage to a motor or ESC by running full throttle with no load, but it's not likely.

A motor having correct voltage rating for the pack you're using is going to be tolerant to the maximal rpm that occurs at full throttle with no load. So there would not be a problem unless subjecting a motor to voltage outside its rating.

In the previous days of ESCs they had slower MCUs (processors) which had a lower limit on erpm (a factor of mechanical rpm). Exceeding that could de-sync the motor and burn up windings. That doesn't happen anymore because ESCs have faster MCUs now and if you do manage to over-speed the ESC which takes some doing, most impose an rpm limit to keep that from happening.

Generally speaking you would run-up without blades in a normal flight configuration where the governor is active. In that case there's no potential for an over-speed condition. If not using a governor, you'd be using a V curve which could max out motor rpm. I think most people use a governor anyway.
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Old 06-11-2018, 12:55 PM   #3 (permalink)
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We never used to do it back in the old days, when there were no governors and we were running glow motors (nitro)-you could overspeed the mechanism and damage it. (I may be the one who made the original comment about not doing it).

With a governor, you can do it technically, but I have not found a good reason to do it, other than testing for vibration affecting the FBL unit in a nitro machine.

With electric, there is no reason to do it, IMHO.

Others will differ, but this is after 42 years of playing with these things.
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