remedial engine question

[patterndude at comcast.net]

After a lot of experience I have concluded that bearing life is highly variable 
in a stressed environment.  30-200 flights are possible in the same 
airplane,engine on bearings purchased at the same time.  Factory OS bearings 
seem to be the worst quality, but there are some that will claim they last 
forecver.  I am just combining all the input to make a general statement. We 
can reduce the variability by providing a better operating env.  Our bearings 
exceed their tolerances at about 250 degrees, which is not that hot, so put a 
cooling scoop on the front or use cheeck cowls to something to keep air flowing 
over the bottom of the crank.  Use a low viscosity oil fuel like Magnum or 
Powermaster special fuel or heli.  Finally, set up fuel delivery to eliminate 
lean runs toward the end of the tank.  This greatly stresses the engine.  Some 
top fliers use bladder tank systems.  I just land with 1/3 tank.

--Lance

--
District 6 AVP
www.aeroslave.com
> Hi all,
> Have an RX with about thirty flights. The second day out I noticed a squeak 
> when turning the prop for restart. Thought something was hitting the 
> spinner, checked all that and it stopped. Yesterday heard it again and 
> noticed the bearings feel a little rough. Now hear is the weird part does 
> this only when hot. When cold feels fine and runs great. I plan on pulling 
> it apart tonight and changing bearings but pretty disappointed at the short 
> life.
> 
> Any one have similar experience?
> 
> Anthony
> 
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