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Old Jun 06, 2014, 04:07 PM
Grass stain your plane.
RAlanBoyle's Avatar
United States, IL, Chicago
Joined Feb 2011
204 Posts
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Motor Destroyed Itself

Take a look at the picture below. This Omega 130 was about a year old, recently I installed it on my PA AddyX; I flew it about 10 times with no issue, then today It threw off the prop (prop adapter w/prop/spinner) in flight. I was able to land the plane with no damage and I figured I must have forgotten the locktite. I opened the cowl and found the motor in this condition.

Any idea how this could have happened?

I was running 45a esc, 12x6apce (not over amped). It was reverse mounted (so the broken part was attached to the firewall.)

Thoughts?
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Old Jun 06, 2014, 04:42 PM
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tacx's Avatar
United States, MI, Macomb
Joined Apr 2009
2,478 Posts
Seems as thought the motor frame could not take the load imposed on it.

May be a case of a faulty manufacturing issue.
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Old Jun 06, 2014, 04:47 PM
homo ludens modellisticus
Ron van Sommeren's Avatar
near Nijmegen, Netherlands
Joined Feb 2001
10,445 Posts
Did you balance your ;prop?

Did one blade break off?

Vriendelijke groeten Ron
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Old Jun 06, 2014, 04:50 PM
Grass stain your plane.
RAlanBoyle's Avatar
United States, IL, Chicago
Joined Feb 2011
204 Posts
Prop was balanced and did not break.
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Old Jun 06, 2014, 05:47 PM
What tree?
Rampage's Avatar
Yucca Valley, California
Joined Aug 2005
2,395 Posts
That's really weird. Especially given that the part that broke isn't really under any rotational load. The bearing is taking all of that.
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Old Jun 06, 2014, 06:16 PM
Grass stain your plane.
RAlanBoyle's Avatar
United States, IL, Chicago
Joined Feb 2011
204 Posts
Ya, it basically looks like I went nose first into the runway. That would make since, but I didn't.
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Old Jun 06, 2014, 06:27 PM
turn, turn, turn.
Athol, Massachusetts
Joined Oct 2005
10,194 Posts
cheap metal.
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Old Jun 06, 2014, 08:13 PM
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Kimber's Avatar
USA
Joined Mar 2005
4,358 Posts
Screws came loose and the remaining tight one carried all the load.
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Old Jun 06, 2014, 08:22 PM
Grass stain your plane.
RAlanBoyle's Avatar
United States, IL, Chicago
Joined Feb 2011
204 Posts
That is an interesting theory. It was held on with two bolts and they were both tight when I took the motor off for the picture.
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Old Jun 06, 2014, 08:37 PM
Registered User
Canada
Joined Nov 2000
6,864 Posts
So you are claiming that that broken off mount was Not bolted to the firewall ?
What grabbed it to tear it off then ??
Possible ..as is anything, but seems as seriously unlikely.. from here.
Clearly there are unmentioned factoids.
Regardless: Best not to repeat the same mistakes :-)
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Old Jun 06, 2014, 08:47 PM
Grass stain your plane.
RAlanBoyle's Avatar
United States, IL, Chicago
Joined Feb 2011
204 Posts
The broken off part was bolted. The broken leg was still holding tight to the bolt and the firewall, just broken off from the rest of the motor.

I understand the hesitancy to believe I am telling the whole truth but this is all of the information. I'd rather not make the same mistake a second time, that's why I'm asking if anyone knows what my mistake was.
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Old Jun 06, 2014, 09:48 PM
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DustBen's Avatar
United States, NE, Kearney
Joined Dec 2011
2,232 Posts
A lot of things aren't making sense.

I'm out...
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Old Jun 06, 2014, 10:42 PM
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Kimber's Avatar
USA
Joined Mar 2005
4,358 Posts
The motor was bolted directly to the fire wall, no X mount? One bolt was over tightened and cracked
the housing. Is there a mark on the firewall where the motor was mounted???
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Old Jun 06, 2014, 10:53 PM
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Ron H's Avatar
Bishopville S.C.
Joined May 2003
3,882 Posts
Over torqued screws maybe?I would check the firewall too.

Dang I think slow.
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Old Jun 06, 2014, 11:30 PM
Wake up, feel pulse, be happy!
C₄H₁₀'s Avatar
United States, AK, Fairbanks
Joined Aug 2009
12,372 Posts
I don't understand the confusion and disbelief here. The story is obvious enough, isn't it?

The prop adapter/spinner assembly wasn't tightened enough, or simply couldn't grip the polished shaft, and gradually worked its way out toward the end. When it got there, it moved heavily off-axis for a fraction of a second, imposing an enormous momentary side load on the shaft before leaving the model behind. That load torqued the rest of the motor laterally toward the side with the leads. Since the opposite side wasn't secured with a screw, it was free to move away from the firewall. At this point, the non-screwed arm on the lead side was not able to bend back toward the bell the way it wanted, so the end of that arm became a fulcrum. Look at the firewall (presumably plywood?) for a large dent of some kind at that location. That'll be the spot which absorbed the force it took to tear the one arm completely loose and severely bend the opposite one, since both of them were attached with steel screws that evidently overpowered the thin aluminum of the backplate.
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