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HelicopterBeginners Corner › rear beaing failure
09-14-2007 07:52 AM  10 years agoPost 1
naked painter

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Mid glamorgan uk

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Hi

If the rear bearing on an OS 50 Hyper is failing, what damage will it cause to the element of the glow plug? I assume that it would rip it out?

In addition if the bearing is failing will it feel rough when the engine is turned over by hand?

The reason I'm asking this is that I've never experienced a rear bearing fail in my 50 hyper and want to know the signs.

Thanks

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09-14-2007 12:32 PM  10 years agoPost 2
MattJen

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UK

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delete

All The Best

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09-14-2007 04:37 PM  10 years agoPost 3
RAK402

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Alhambra, CA

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With apologies to Matt:

"If you dont aready do it, after your last run, run the engine dry by letting it idle and clamping off the fuel supply, once it stops, turn it over until it fires no more,"

This is a good way to induce bearing failure-running it dry. It is very hard on the piston and ring, also.

Never, ever, ever do this (IMHO).

I have two Hypers, one about exactly a year old-about 50 flights on it and never, ever run it dry. I always just shut the throttle off when finished.

I live in Southern California, and it is hot, humid, dry, etc.

By the way, Finless Bob did a disertation on this subject on another forum. According to him, the problem is electrolysis via incorrect bearing material selection by OS, not moisture absorbtion.

31 years at this, and many, many OS engines later, I would never run one dry.

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09-14-2007 06:15 PM  10 years agoPost 4
MattJen

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UK

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deleted

All The Best

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09-14-2007 07:20 PM  10 years agoPost 5
nivlek

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Norfolk England

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Another sign is raised engine temps .
As for running the engine dry or using after run oil , I don't do either . I've been running an OS50 Heli for three seasons ,and it's still on its original bearings . In fact , sinse my father and myself started flying RC models , in 1978 , we have probably changed around seven to ten sets of bearings between us , but these have all been due to the bearing wearing out , not corrosion .
The only thing that I can possibly put it down to is that we have always used a little castor in our fuel .

At the end of the day , it gets dark .

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09-14-2007 07:55 PM  10 years agoPost 6
JamesGupwell

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Knutsford - Cheshire

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wow Nivlek

That is good going, I have had bearings on a new engine go in a matter of weeks,Last year there seemed to be a spate of OS50 hyper bearings failing, i dont know the reasons for this were ever published or reached.

I have never thought of putting a little castor oil in into the mix.

James

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