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Breaking edf fan at motor mount
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RADINSKY View Drop Down
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Posts: 8 		  Quote RADINSKY Quote  Post ReplyReply Direct Link To This Post Topic: Breaking edf fan at motor mount
    Posted: 18/Jul/2012 at 10:28pm
I have broken 2 five inch fans running lightly on 12 cell.
The plastic motor mount keeps breaking within the fan!
What on earth am I doing wrong!??
I'd love some feedback.
Thanks guys.
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bigdaddy1962 View Drop Down
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Posts: 295 		  Quote bigdaddy1962 Quote  Post ReplyReply Direct Link To This Post Posted: 18/Jul/2012 at 11:37pm
have u balanced the blade ?
IF YOU CANT STAND THE CRASH , GET OFF THE RUNWAY
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RADINSKY View Drop Down
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Posts: 8 		  Quote RADINSKY Quote  Post ReplyReply Direct Link To This Post Posted: 19/Jul/2012 at 5:34am
The blade was balanced. I thought maybe I'm doing up the motor screws too tight! Im afraid of them coming loose!
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Jarred1993 View Drop Down
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Posts: 15 		  Quote Jarred1993 Quote  Post ReplyReply Direct Link To This Post Posted: 19/Jul/2012 at 3:57pm
well thats where your going wrong they dont need to be done up extremely tight i done the same thing the first time i installed a new motor in mine they only need to be tight enough to hold the engine in place without any play otherwise you are just over tightening them and putting extra stress on the motor mount and even fracturing it if you think the screws will come loost just use some thread lock on them and they will be fine trust me.
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spitfire2010 View Drop Down
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Posts: 3290 		  Quote spitfire2010 Quote  Post ReplyReply Direct Link To This Post Posted: 19/Jul/2012 at 8:24pm
+1 for thread lock
The MAAA can end aero-modelling apartheid Today! They think you're stupid and won't notice MOP057
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RADINSKY View Drop Down
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Posts: 8 		  Quote RADINSKY Quote  Post ReplyReply Direct Link To This Post Posted: 20/Jul/2012 at 7:39pm
Thanks a mill!!!!
I'm pretty sure threadlock is the answer. If not I'll let you know.
Thaaaaank yoooou!!!!
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4stripes View Drop Down
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Posts: 154 		  Quote 4stripes Quote  Post ReplyReply Direct Link To This Post Posted: 24/Jul/2012 at 7:34am
Thread locker will weaken some plastics. Try to avoid the plastic.

The mount is probably breaking due vibration from imbalance. You will feel the vibration even at low power. You need to balance the fan best you can, then dynamic balance the fan and motor together. RC Groups and RC Canada have threads discussing how to dynamically balance an EDF. The "clock" method of repositioning the fan to the smoothest running position works wonders.



Edited by 4stripes - 24/Jul/2012 at 7:42am
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