Engine Bearing Air Scoops

[patterndude at attbi.com]

Some bearings seem to die a young death, others last a lot longer.  Without a 
thermocouple and telemetry we can't be sure.  But I put an AeroSlave head scoop 
on my plane last August when my factory OS140 bearings died after one month of 
service.  The new bearings have now lasted 10 months, probably 150 flights.

I will be changing them before Nats whether they need it or not.
--Lance
> Bob,
> 
> If there was any time to test the effects of additional cooling it was this 
> weekend in Nederland.  About 95 degrees and 80% humidity.   I have a recessed 
> cooling port just above the bottom of the crank case on my Aries(looks like a 
> blow hole) It directs the air right at the bottom of the case of this O.S. 1.40  
> After a flight the spinner is slightly warm but very normal.  If I was to just 
> run the engine on the ground for a minute or two the the spinner gets pretty 
> warm.  So I can only assume that it is helping a lot while in the air.  A little 
> time on this engine will tell on the bearing thing.  
> 
> Wayne G.
>   ----- Original Message ----- 
>   From: Bob Pastorello 
>   To: NSRCAMail 
>   Sent: Sunday, June 22, 2003 3:39 PM
>   Subject: Engine Bearing Air Scoops
> 
> 
>   I know we're supposed to be flying, but I'm still motor-less...but getting 
> there...
>       A question for anyone who knows....what is the procedure for installing 
> scoops/baffles on the cowling to cool the main bearing?
>       Is there experience to justify putting them on the OS/Mintor/Webra larger 
> two strokes?
>       Any websites with "how to" info?
>       Do baffles/scoops lengthen bearing life and reduce heat???
> 
>   Bob Pastorello, Oklahoma
>   NSRCA 199, IMAC 1320, AMA 46373
>   rcaerobob at cox.net
>   www.rcaerobats.net
> 
> 
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