Rust

[Dean Pappas]

Hi Chris,
With SS bearings in an OS 140 RX we are seeing several hundred flight life. That's with Stanley's 15% (S&W) and Amsoil MP after-run.
Hello to the clan ...
    Dean
 

Dean Pappas 
Sr. Design Engineer 
Kodeos Communications 
111 Corporate Blvd. 
South Plainfield, N.J. 07080 
(908) 222-7817 phone 
(908) 222-2392 fax 
d.pappas at kodeos.com 

-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]On Behalf Of XCellHeli at aol.com
Sent: Tuesday, October 12, 2004 4:16 PM
To: discussion at nsrca.org
Subject: Rust


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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