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<DIV><SPAN class=853435519-24032004><FONT face=Arial color=#0000ff size=2>Hi
Ed,</FONT></SPAN></DIV>
<DIV><SPAN class=853435519-24032004><FONT face=Arial color=#0000ff size=2>Gas
does less evaporative cooling going into the engine, than alchohol, and it burns
hotter. On top of that, as John mentions, the reduced oil carries away less
heat. My old 3W60 with alky is tough to get warmed up fully, on a cold day! So
the reason that you see very little care taken with Pattern ships is due to the
forgiving nature of alchohol fuel. If we were racing, then we would carefully
minimize cooling drag and proper ducting would be the order of the day. My
last hard-mounted ship had such tight ducting, with a small intake and
relatively small exhaust opening. I never had a cooling problem, though we
weren't torque rolling for laughs at the end of every flight, back
then.</FONT></SPAN></DIV>
<DIV><SPAN class=853435519-24032004><FONT face=Arial color=#0000ff
size=2>Regards,</FONT></SPAN></DIV>
<DIV><SPAN class=853435519-24032004><FONT face=Arial color=#0000ff size=2>Dean
P.</FONT></SPAN></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> John Ferrell
[mailto:johnferrell@earthlink.net]<BR><B>Sent:</B> Wednesday, March 24, 2004
2:57 PM<BR><B>To:</B> discussion@nsrca.org<BR><B>Subject:</B> Re: Cowl
baffling<BR><BR></FONT></DIV>
<DIV><FONT face=Arial size=2>Don't gasoline engines use a lot lower oil mix
ratio? I think an awfull lot of heat goes out with the exhaust oil.
</FONT></DIV>
<DIV> </DIV>
<DIV>John Ferrell <BR><A
href="http://DixieNC.US">http://DixieNC.US</A><BR></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=Ed_Alt@hotmail.com href="mailto:Ed_Alt@hotmail.com">Ed Alt</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, March 20, 2004 9:53
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Cowl baffling</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>Just wondering what's commonly done to direct
proper airflow in pattern birds with 2C engines. I'm used to creating
very close fitting baffling to direct air right at the cylinders of large 2
cycle gasoline fed engines and keeping the baffling so close to
the fins as to force it through them. Even the space over the heads is
baffled to force air through the head fins. After that, I make the
area of the air exhaust opening at least 3X that of the total intake
area. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>So far, in studying various setups of pattern
ships, I haven't seen anyone going to this kind of trouble. Not
wishing to go to any uneccesary work, but is there a reason why no one adds
baffling for 2C glow engines? I've got a Focus II with a Webra 1.60 if
that helps with the answer.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Thanks</FONT></DIV>
<DIV><FONT face=Arial
size=2>Ed</FONT></DIV></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>