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HelicopterBeginners Corner › Help! Is my motor damaged??
11-30-2007 02:47 AM  9 years agoPost 1
Vertiviper

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NY- USA

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Axe CP

I've owned this heli for about a month now. I have roughly 20-30 flights on it, never crashed. I noticed just now that when I land and throttle all the way down the rpms of the main blades no longer decrease at a slow pace...its now an abrupt stop (it used to take 4-5 seconds to completely stop spinning, now takes 1-2) I also noticed i'm now hearing a louder higher pitched whine....i'm hoping i dont need a new motor already..

any thoughts?

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11-30-2007 03:09 AM  9 years agoPost 2
george0079

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USA

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Sounds like your gear mesh is too tight.

Hell... I can fix that.
Uh oh..
Nope.
It's ***ked!!!
RE-KIT!!!!!

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11-30-2007 03:25 AM  9 years agoPost 3
Vertiviper

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NY- USA

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great call!

I think when i loaded the battery i mustve loaded it in too far and it nudged the main motor, moving it closer to the main gear and on an angle.

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11-30-2007 11:25 AM  9 years agoPost 4
DJDAZ

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Perth Western Australia

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Gear mesh would be a really good place to start. Otherwise have a look at your mainshaft bearings.

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11-30-2007 01:50 PM  9 years agoPost 5
SSN Pru

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Taxachusetts

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nudging of the battery against the motor shouldn't have been able to move the motor. This means that in-flight forces could potentially make a bad day for you.

I would try and secure that motor a bit better after getting the mesh correct.

Another question...

Do you know how to set the mesh correctly?

Stupidity can be cured. Ignorance is for life!

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11-30-2007 03:05 PM  9 years agoPost 6
Vertiviper

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NY- USA

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/\ i dont know what mesh even means? When i moved the motor it clicked back into place. thanks.

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11-30-2007 05:01 PM  9 years agoPost 7
SSN Pru

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Taxachusetts

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mesh refers to the interaction of the gear teeth. specifically how the pinion (gear on motor) gear teeth interact with the main gear teeth.

The (arguably) easiest way to set mesh correctly is to get a piece of copier paper. hold it such that it gets "sucked" into the mesh area between the pinion and main gear. press the motor close to the main gear and tighten the screws down. pull the piece of copier paper out and you should now have a half way decent mesh setup. Getting it closer than this requires some level of experience and knowledge. That will coem to you in time. But for now, this will get you running in a more efficient manner.

Note: after setting your mesh you should have a low level of backlash.

I will assume you dont know what backlash is. Ia aplogize if you do.

Backlash is a good indicator of how good your mesh is. If you hold the pinion, or main gear (it doesnt matter which) perfectly still, the other gear should be able to rock slightly back and forth ( a few thousandths, or about two to three times the thickness of the copier paper)...

Try it and experiment. By setting the mesh correctly, you will decrease the "drag' of the drive train and decrease the power requried from the motor. This will in turn decrease your amperage demands from the battery which will decrease your voltage drop. It will also help everything run cooler.

good luck.

Stupidity can be cured. Ignorance is for life!

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