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<DIV><FONT face=Arial size=2>Think about this. Have you ever seen bearings
rust in a tank with aluminum tubes and no clunk as in a Tetra bladder tank setup
?? I've seen it, Dave Funk's OS 140RX in his Hydeaway rusted the original
bearing in very few flights. IMHO I wouldn't expect bearings to rust
in a container of clean unburnt fuel just because of the roughly
20% oil content. I do agree the fuel breaks down into some sort of compound
that along with type and mix of materials used in many of our glow engines
promotes some form of corrosion. If you look at the YS engines it is rare to see
a rusted wrist pin or crankshaft, IMO due at least in part to the different
plating YS does to their engine components. Dave Funk and I had to replace the
aluminum tubes in my year old Tetra tank at the Sydney NY contest late Saturday
evening, the fuel supply tube was black as coal and broken off in the tank right
where it entered the rubber stopper. I have never seen that happen with brass
tubes in the tank. Seems we all forgot the days of the piped 60's, we all had
bearing problems back then. The only engine from the factory that I didn't have
a bearing rusting problem was my YS61AR which at least my engine came with a
pre-lubed stainless steel rear bearing with 2 SEALS. But my YS61 long stroke
would rust a standard rear bearing in the time it took to consume a cup of
coffee. I know Dave Lockhart has hundreds of flights on a OS140RX w/a stainless
rear bearing with 2 seals, in Boca Bearing talk "2RS" not metal shields which
are designated "ZZ". The fact he has hundreds of flights on those sealed
stainless rear bearings also dispels the myth the rear bearing on the OS140 is
undersized IMO.</FONT></DIV>
<DIV><FONT face=Arial size=2>Ed M.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=rcaerobob@cox.net href="mailto:rcaerobob@cox.net">Bob Pastorello</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, December 06, 2003 10:11
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Fuel/Water,
Bearing/Rust</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>Good point, Bill.</FONT></DIV>
<DIV><FONT face=Arial size=2> Does anyone KNOW if the "brass
corrosion"/conversion into acetic acid is the REAL deal? How can we find
out?</FONT></DIV>
<DIV><FONT face=Arial size=2> Wouldn't it be bizarre if the
corrosion on bearings issue was due to something like this?</FONT></DIV>
<DIV><BR>Bob Pastorello, Oklahoma<BR>NSRCA 199, AMA 46373<BR><A
href="mailto:rcaerobob@cox.net">rcaerobob@cox.net</A><BR><A
href="http://www.rcaerobats.net">www.rcaerobats.net</A></DIV>
<DIV> </DIV>
<DIV> </DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=billglaze@triad.rr.com href="mailto:billglaze@triad.rr.com">Bill
Glaze</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, December 06, 2003 9:48
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Fuel/Water,
Bearing/Rust</DIV>
<DIV><BR></DIV>Bob:<BR>You might want to take a look at the plated clunks
occasionally, I've had the plating break down, (possibly from vonstant
vibratory contact with the bottom of the fuel tank) and then the brass
begins to corrode. Bill Glaze<BR><BR>Bob Pastorello wrote:<BR>
<BLOCKQUOTE cite=mid003601c3bb37$d6717120$5da26144@oemfu7ig3a7fro
type="cite"><PRE wrap="">Also, most clunks I've seen lately aren't brass-looking. They apparently
are plated and look shiny-brite metal. I've drilled some of them, to find
they're brass underneath. So that sort of begs the question, WHY would fuel
tank manufacturers add the expense of plating a KLUNK ??
My Mintor setup has no brass that I can see; it will be interesting to
see how this goes. Has an MK tank, aluminum tubes, nylon tees in lines.
Plated clunk in the tank.
Bob Pastorello, Oklahoma
NSRCA 199, AMA 46373
<A class=moz-txt-link-abbreviated href="mailto:rcaerobob@cox.net">rcaerobob@cox.net</A>
<A class=moz-txt-link-abbreviated href="http://www.rcaerobats.net">www.rcaerobats.net</A>
----- Original Message -----
From: "Brian Young" <A class=moz-txt-link-rfc2396E href="mailto:b4598070@yahoo.com"><b4598070@yahoo.com></A>
To: <A class=moz-txt-link-rfc2396E href="mailto:discussion@nsrca.org"><discussion@nsrca.org></A>
Sent: Friday, December 05, 2003 7:45 AM
Subject: RE: Fuel/Water, Bearing/Rust
</PRE>
<BLOCKQUOTE type="cite"><PRE wrap="">Cant remember if the fuel needed the water in it to
break down into acetic acid..anyone recall? ;0
I have had older brass clunks corrode the nipple off
at the end of the tubing.....I have noticed the little
green brass particles plugging up the ports on some of
my engines....always wondered why they used the brass
for this stuff. I use plastic or aluminum if I can,
and steel clunk if available.
--- Dwayne & Nancy <A class=moz-txt-link-rfc2396E href="mailto:dwaynenancy@cox.net"><dwaynenancy@cox.net></A> wrote:
</PRE>
<BLOCKQUOTE type="cite"><PRE wrap="">Bob, Joe said that blaming water in the fuel as the
cause of bearing
rust was a "folk tale". The cause was the fuel
decomposing into acetic
acid (vinegar). The decomposition is caused by the
catalytic effect of
the brass components inside the fuel tank. Joe
tried leaving bearings
in several brands of fuel for four months without
any rust forming. You
should read the magazine more carefully. You can't
tell when something
valuable with show up. <VBG> Dwayne
-----Original Message-----
From: <A class=moz-txt-link-abbreviated href="mailto:discussion-request@nsrca.org">discussion-request@nsrca.org</A>
[<A class=moz-txt-link-freetext href="mailto:discussion-request@nsrca.org">mailto:discussion-request@nsrca.org</A>]
On Behalf Of Bob Pastorello
Sent: Thursday, December 04, 2003 8:25 PM
To: <A class=moz-txt-link-abbreviated href="mailto:discussion@nsrca.org">discussion@nsrca.org</A>
Subject: Re: Fuel/Water, Bearing/Rust
Okay - Matt - since my MA already found it's way to
the shredder....
WHAT did he say about rust protection?
Bob Pastorello, Oklahoma
NSRCA 199, AMA 46373
<A class=moz-txt-link-abbreviated href="mailto:rcaerobob@cox.net">rcaerobob@cox.net</A>
<A class=moz-txt-link-abbreviated href="http://www.rcaerobats.net">www.rcaerobats.net</A>
----- Original Message -----
From: <A class=moz-txt-link-abbreviated href="mailto:Rcmaster199@aol.com">Rcmaster199@aol.com</A>
To: <A class=moz-txt-link-abbreviated href="mailto:discussion@nsrca.org">discussion@nsrca.org</A>
Sent: Thursday, December 04, 2003 6:11 PM
Subject: Fuel/Water, Bearing/Rust
The diatribe of the last week or so on this list has
been, shall we say,
rather........ interesting, (except for the news
about Kirk Gray, that's
plain sad). It's time for something new.
In this month's Model Aviation, Joe Wagner talks
about experiments he
has run with a trusty old engine. He ran baseline
performance data with
his regular fuel and then he added water in his fuel
to see how badly
performance would be affected. His results where
very interesting. Shall
we say that he made chopped meat out of that "sacred
cow".
He also briefly touches on what really is the root
cause of bearing
rust. Even the uninitiated should find that
interesting. Could a
solution to all of your OS bearing woes be this
simple?
There, that ought to whet your whistle.
Matt K
</PRE></BLOCKQUOTE><PRE wrap="">__________________________________
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