Rust

[XCellHeli at aol.com]

RE: OS 1.40 rear bearing rust - by Bax OS Factory Engine Support
~~~~~~~~~~~~~~

On a Pattern engine, being flown in a Pattern airplane, 100 flights would be 
about normal for bearing wear.  A competitive Pattern flyer will need to 
change out the bearings 1-2 times per flying season (depending upon how much 
practice time is spent).

Corrosion is caused by model fuel.  The alcohol in the fuel absorbs water.  
Synthetic oils are slightly acidic and are not corrosion preventers, they are 
lubricants.  The two are not necessarily the same.  Some spent combustion 
products always work themselves into the lower-end of the engine and they are 
slightly acidic.  This encourages corrosion by providing an electrolyte between the 
dissimilar metals in the engine (aluminum and steel).

You need to run the engine dry of fuel at the end of each flying session, and 
then flood the engine with an after-run product.  One of the hobby blends of 
after run oil, Marvel Mystery Oil, automatic transmission fluid, non-graphite 
gun oil, a good coating-type machine tool oil...all will work well.

If the fuel has more than 25%-50% of the oil blend being castor oil, you'll 
also get significant corrosion protection.  Engines run on all-castor fuels 
don't get much corrosion, but you do have to clean the engine to remove the 
varnish buildup from the castor oil.  It also will become gummy when it sits for a 
long time. 


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Chris Dansereau Sr.
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