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Eflite extra 300, motor mount

Old 08-28-2019, 11:20 AM
  #1  
ukgooner
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Default Eflite extra 300, motor mount

Hi, thought I'd share my experience with this, brought the extra 300 1.3m a couple of months ago, after 30 flights I noticed the motor seemed loose, after removing the mount it fell into 5 pieces and had cracked around every hole where it screws to the motor, I'm surprised to find it's made out of plastic painted to look like metal, contacted horizon hobby who told me they are on order and won't be able to get me one till December, very unhappy flier
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Old 08-28-2019, 06:34 PM
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Wildflyer
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Do you mean the X mount? I see they are back ordered.
If so they are sort of standard sizes, you may be able to get one from another motor.
Or just make one from heavy aluminum or something else.
Are you sure it is plastic?
A prop slightly out of balance will cause vibration that could result in metal fatigue. The metal X mount can fracture like it is plastic or glass. I learned that the hard way.

If it is the motor tube, they show that in-stock.
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Old 08-28-2019, 07:01 PM
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solentlife
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Why not do away with the stock part and create your own mount ? Quality plywood bolted instead.
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Old 08-28-2019, 07:10 PM
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ukgooner
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Default Motor mount

Hi
I've spent an evening looking for on but it doesn't seem to be a common size, thankfully a fellow flyer at my club as offered to make me one, even so I wouldn't have expected it to fail and a 4 month wait for a replacement seems poor to me, I don't think it's a 4 month wait for a new plane, thanks for the advice
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Old 08-28-2019, 08:38 PM
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solentlife
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I have a number of models that I have replaced the stock motor boxes ... mounts and parts. Typical materials used in models today are what I term 'minimalist' - that is in the search to save weight - the material is shaved to the least possible.

Using older techniques and with sensible approach - its possible to stay in similar weight but have better materials and structure,.

One model springs to mind ... Edge 540 Racer. Stock has a stupid plastic affair to stand the motor of from the firewall. It has 4 screws via feet that are about 2cm long to the square mount to motor. The legs snap of at slightest 'incident'.
Replacement used ply disc and 4 long self tappers and spare prop shaft rings.. I then had variable thrust adjustment and a mount that could stand WW3 !! Weight was just about 5gr more ..
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Old 08-28-2019, 08:53 PM
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ukgooner
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Yep, I think that's well worth a try, thanks for the input
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Old 08-28-2019, 11:06 PM
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solentlife
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Try some photos for us all to look at it and maybe we can knock up a few ideas for you ?
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Old 08-29-2019, 12:42 AM
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Wildflyer
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Make sure your props are balanced.
I have had a brushless motor and ESC get so confused by the strange feedback the ESC was getting, that the ESC just decided to stop the motor and restart. the plane about stopped in midair. After I balanced the prop, every thing flew great.

My favorite balancer is an old High Point unit, extremely sensitive and accurate. I check every prop I buy, a few (25%) are good, but most need help. I just put clear tape on the backside of the blade near the tip. trim until balanced.

I had one brand name prop that required 3 layers of tape on the outer 1/3 of the blade. Pretty severely out of balance.

Good luck with your mount. I have made a firewall / motor mount before out of high quality 1/8" aircraft ply about 2" square, I bolted the motor to one side, then glued the thing to the front of the plane, I didn't care if it was removable on that plane.
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Old 11-29-2019, 01:37 AM
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WyomingOutdoors
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I know two other rc pilots that had this happen to their 300's as well!
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Old 11-29-2019, 09:23 AM
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CHELLIE
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Originally Posted by ukgooner View Post
Yep, I think that's well worth a try, thanks for the input
https://www.rcplanet.com/e-flite-ext...ount-efl11594/

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Old 11-29-2019, 09:28 AM
  #11  
CHELLIE
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lots of ways to mount a out runner motor


https://wattflyer.com/forums/showthread.php?t=39483
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