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E-Flite Power 15 high RPM vibration - 1/30/2013 5:32 PM   
Striker



Posts: 357
Score: 100
Joined: 1/14/2003
Last Login: 3/25/2013
From: Ottawa, ON, CANADA
Status: offline 		Hi Guys,

I know this is a shot in the dark question but dont know if anyone here has the same problem.

I have put together an Acro Master and got a new E-Flite Power 15 brushless motor for it. I have not flown this thing as yet all because I am getting a violent vibration at high RPMS just around 6500 RPM.

I have a perfectly balanced APC 13X6.5 prop and an E-Flite prop hub. If the battery's peak power drops, it runs OK. I can reduce my throttle by about 10% but that's a band aid patch approach which I hate, it does this 2 clicks below full throttle.

I have read that some people said these motors are not balanced well etc. All I did to it was to use my vice and a socket to push the shaft to the other end since it has to be front mounted. I am an electronic tech and a huge mechanical background so I cant see it being screwed up by that.

Anyone had these issues with this motor? This is annoying me to the core.


Thanks.

_____________________________

Pilots are Kings when they smashed their wings and say ah s**t, just a couple of dings.
The greatest high is... Hitec

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RE: E-Flite Power 15 high RPM vibration - 1/31/2013 10:27 AM   
whitecrest



Posts: 305
Score: 106
Joined: 8/8/2007
Last Login: 5/2/2013
From: Orleans, MA, USA
Status: offline 		Is there any vibration with the prop off? That ought to rule out any fundamental motor imbalance. I would think a mechanical imbalance in the prop or hub would be evident well before 6500RPM. It might be worth trying a slightly smaller prop or programming higher ESC timing. Timing issues usually crop up when a motor is being pushed.

Another thought is to check the motor mount for any looseness or play.

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Tim

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RE: E-Flite Power 15 high RPM vibration - 1/31/2013 1:31 PM   
Striker



Posts: 357
Score: 100
Joined: 1/14/2003
Last Login: 3/25/2013
From: Ottawa, ON, CANADA
Status: offline 		Everything is tight and balanced, I am beginning to think after doing some more testing that its a resonance issue.

_____________________________

Pilots are Kings when they smashed their wings and say ah s**t, just a couple of dings.
The greatest high is... Hitec

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RE: E-Flite Power 15 high RPM vibration - 2/7/2013 11:22 AM   
chuckk2


 

Posts: 371
Score: 106
Joined: 7/24/2007
Last Login: 5/22/2013
From: Warner Robins, GA, USA
Status: offline 		The ESC may be faltering at higher settings, or the battery cannot supply the current required.


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       Post #: 4

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