remedial engine question

[Bill Glaze]

Joe:
Interesting.  I had a GB Sukhoi with several hundred flights on it.  Flown for
fun and in IMAC contests.  The engine (Y.S.) was on it's second airplane, and it
was so dependable that I didn't even have a hole in the cowl for the needle.
Just set it once, never touched it for over a year.  Didn't need to.  Didn't
want to.
On the few engines of mine I have fiddled with, I notice that I usually wind up
a click or maybe 2 in a different position from where it was to begin with.

Bill Glaze

Joe Lachowski wrote:

> One of the best pieces of advice on long bearing life is to leave the damn
> needle valve alone. Every contest I have been to this year I've seen people
> screwing around with the damn thing trying to get the last RPM out of it or
> trying to adjust for the conditions of the day because they think it is
> necessary. I leave mine a tad on the rich side and leave it alone just like
> I ran my YS's in the past and hopefully don't have to touch it until the end
> of the season or when a bearing change is in order( In my case, just before
> the Nats and the end of the season) . All it takes is one  lean run to do in
> the bearings. Not touching the damn thing reduces those chances.
>
> >From: patterndude at comcast.net
> >Reply-To: discussion at nsrca.org
> >To: discussion at nsrca.org
> >Subject: Re: remedial engine question
> >Date: Mon, 25 Aug 2003 16:41:13 +0000
> >
> >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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