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<DIV><FONT face=Arial size=2>Matt: The engine ran
fine. As did another of my friends</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Both on the first flight,and all subsequent
flights.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Regards,,,,,,,,,,,,,,,Dave</FONT></DIV>
<BLOCKQUOTE
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=Rcmaster199@aol.com
href="mailto:Rcmaster199@aol.com">Rcmaster199@aol.com</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, July 05, 2003 12:09
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: O.S. 1.4 RX bearings</DIV>
<DIV><BR></DIV><FONT face=arial,helvetica><FONT lang=0 face=Arial size=2
FAMILY="SANSSERIF">Dave,<BR><BR>If you don't wash the grease out of your new
bearing, it will wash out for you on the first flight. Your engine won't run
very well during this flight and you will not be able to restart the engine
for a second run, because your plug would be fouled<BR><BR>There would be
nothing wrong with the engine so don't panic; simply replace the plug and it
will run fine after that.<BR><BR>To avoid the hassle, just wash out the grease
before you install it, and oil it with castor or synthetic, and you'll be
fine.<BR><BR>This happened to me about 20 years ago at a contest no less. If
memory serves, the bearing had the thin metal plate "seals" on both sides, and
I figgered it was like that for a reason. So I didn't bother to wash the
grease out. Wrong move and a bad round of
flying<BR><BR>regards<BR><BR>Matt<BR><BR>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid; MARGIN-RIGHT: 0px"
TYPE="CITE">Subj:<B>Re: O.S. 1.4 RX bearings </B><BR>Date:7/4/2003 9:21:07
PM Eastern Daylight Time<BR>From:<A
href="mailto:dfs@navnet.net">dfs@navnet.net</A><BR>Reply-to:<A
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A><BR>To:<A
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A><BR><I>Sent from
the Internet </I><BR><BR><BR><BR>Matt: I just changed the rear
bearing after 80 flights. I was curious as to its' condition. No after
run oil was used at all,and the bearing was in apparently good
shape.</FONT><FONT lang=0 style="BACKGROUND-COLOR: #ffffff" face=Arial
color=#000000 size=3 FAMILY="SANSSERIF"><BR><BR></FONT><FONT lang=0
style="BACKGROUND-COLOR: #ffffff" face=Arial color=#000000 size=2
FAMILY="SANSSERIF">I found it interesting that the replacement bearing (from
O.S.) had nary a number or letter on it. Also it was packed with
grease,and either the seals had been removed,or never installed in the first
place,as the outer race was recessed for seals. A friend found
the same when he bought a replacement bearing.</FONT><FONT lang=0
style="BACKGROUND-COLOR: #ffffff" face=Arial color=#000000 size=3
FAMILY="SANSSERIF"><BR><BR></FONT><FONT lang=0
style="BACKGROUND-COLOR: #ffffff" face=Arial color=#000000 size=2
FAMILY="SANSSERIF">A commercial industrial bearing supply house might be
able to produce a bearing with larger balls,and thinner races,as per your
suggestion.</FONT><FONT lang=0 style="BACKGROUND-COLOR: #ffffff" face=Arial
color=#000000 size=3 FAMILY="SANSSERIF"><BR><BR></FONT><FONT lang=0
style="BACKGROUND-COLOR: #ffffff" face=Arial color=#000000 size=2
FAMILY="SANSSERIF">Regards,,,,,,,,,,,,,Dave</FONT><FONT lang=0
style="BACKGROUND-COLOR: #ffffff" face=Arial color=#000000 size=3
FAMILY="SANSSERIF"><BR></FONT><FONT lang=0 style="BACKGROUND-COLOR: #ffffff"
face=Arial color=#000000 size=2 FAMILY="SANSSERIF"><BR>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid; MARGIN-RIGHT: 0px"
TYPE="CITE">----- Original Message ----- <BR><B>From:</B> <A
href="mailto:Rcmaster199@aol.com">Rcmaster199@aol.com</A> <BR><B>To:</B>
<A href="mailto:discussion@nsrca.org">discussion@nsrca.org</A>
<BR><B>Sent:</B> Friday, July 04, 2003 7:32 PM<BR><B>Subject:</B> Re: O.S.
1.4 RX bearings<BR><BR><BR>Bob,<BR><BR>RPM and load are the killers of
bearings, all else being equal. Larger props turning lower rpm should help
the problem but the greater load does not. <BR><BR>I think dave hit it on
the head: The OS bearing was intended for a smaller engine designed to
turn a smaller load at the same rpm. <BR><BR>The 140 should be using a
larger bearing with proportionately larger ball bearings . These in turn,
would spin at proportionately slower rates when the engine is at speed,
and their larger size would distribute the load better.<BR><BR>In the
meantime, I recommend that someone out there who uses the engine should
try to find a bearing that uses thinner races and larger ball bearings.
It's the smallish ball bearings turning too fast due to their small
diameter, in the standard bearing, that wear out under the load of the
140.<BR><BR>Another approach is what 3M Mintors have: two main bearings
that look the same as the OS 140 bearing (but I have not actually measured
these). The idea is better load distribution, but nothing is really being
done about the rpm the balls are turning. <BR><BR>Overall, I prefer the
WEBRA approach: Larger bearing all the way around. I expect the bearing to
last for years.<BR><BR>Matt Kebabjian<BR><BR><BR>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid; MARGIN-RIGHT: 0px"
TYPE="CITE">Subj:<B>Re: O.S. 1.4 RX bearings </B><BR>Date:7/4/2003
3:45:17 PM Eastern Daylight Time<BR>From:<A
href="mailto:rcaerobob@cox.net">rcaerobob@cox.net</A><BR>Reply-to:<A
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A><BR>To:<A
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A><BR><I>Sent
from the Internet </I><BR><BR><BR><BR>Those of us who ran the old OS 61
RF's, pumped or not, remember when bearings lasted forever....UNTIL we
started putting high pitch, high diameter props on the
beasts.</FONT><FONT lang=0 style="BACKGROUND-COLOR: #ffffff" face=Arial
color=#000000 size=3 FAMILY="SANSSERIF"><BR></FONT><FONT lang=0
style="BACKGROUND-COLOR: #ffffff" face=Arial color=#000000 size=2
FAMILY="SANSSERIF"> Now, we've just added more pitch
and diameter over the years, and my experience has been that bearing
life relates directly to those factors. Of course lubrication, and
moisture, certainly contribute, but most bearings I've dissassembled
have had the balls and races brinnelled and beaten to death.
</FONT><FONT lang=0 style="BACKGROUND-COLOR: #ffffff" face=Arial
color=#000000 size=3 FAMILY="SANSSERIF"><BR></FONT><FONT lang=0
style="BACKGROUND-COLOR: #ffffff" face=Arial color=#000000 size=2
FAMILY="SANSSERIF"> That starts plating flaking, and
eats things...it could just be coincidence that they rust,
too....</FONT><FONT lang=0 style="BACKGROUND-COLOR: #ffffff" face=Arial
color=#000000 size=3 FAMILY="SANSSERIF"><BR></BLOCKQUOTE><BR></FONT><FONT
lang=0 style="BACKGROUND-COLOR: #ffffff" face=Arial color=#000000 size=2
FAMILY="SANSSERIF"></BLOCKQUOTE><BR></BLOCKQUOTE><BR><BR></BLOCKQUOTE></FONT></FONT></BODY></HTML>