<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<META content="MSHTML 5.50.4807.2300" name=GENERATOR></HEAD>
<BODY id=role_body style="FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY: Arial"
bottomMargin=7 leftMargin=7 topMargin=7 rightMargin=7>
<DIV><SPAN class=466480201-21022006>Matt and all, </SPAN></DIV>
<DIV><SPAN class=466480201-21022006></SPAN> </DIV>
<DIV><SPAN class=466480201-21022006>"On the other hand, with so many of us
having stopped building, where's the creativity and innovation going to come
from? It saddens me to see a whole new generation of "modellers" who only want
to fly, using ready made everything."</SPAN></DIV>
<DIV><SPAN class=466480201-21022006></SPAN> </DIV>
<DIV><SPAN class=466480201-21022006></SPAN> </DIV>
<DIV><SPAN class=466480201-21022006>I couldn't agree more!!!!! A sign of the
times we live in.</SPAN></DIV>
<DIV><SPAN class=466480201-21022006></SPAN> </DIV>
<DIV><SPAN class=466480201-21022006>Tom </SPAN></DIV>
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT
face=Tahoma>-----Original Message-----<BR><B>From:</B>
nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org]<B>On Behalf Of
</B>Rcmaster199@aol.com<BR><B>Sent:</B> Tuesday, 21 February 2006 9:26
AM<BR><B>To:</B> nsrca-discussion@lists.nsrca.org<BR><B>Subject:</B> Re:
[NSRCA-discussion] Cooling/spinners<BR><BR></FONT></DIV><FONT id=role_document
face=Arial>
<DIV>
<DIV>In a message dated 2/20/2006 2:04:45 PM Eastern Standard Time,
simestd@netexpress.com writes:</DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><FONT
style="BACKGROUND-COLOR: transparent" face=Arial>If you've ever taken a close
look at the<BR>engine installation on a high performance piston aircraft, the
cowling<BR>is typically very tight by pattern standards and they have nowhere
near<BR>our 3:1 outlet:intake rule of thumb for cooling. Instead they
make<BR>extensive use of baffling and ducting to control the air path and
make<BR>it work for them.</FONT></BLOCKQUOTE></DIV>
<DIV></DIV>
<DIV>It's "elementary" Thermo 101 kind of stuff with a little fluid dynamics
thrown in for good measure. Keep the air in the turbulent regime around the
engine to maximize cooling effectivess. To some degree, we did that in our
earlier designs by maintaining a slender fuse and cowling in tighter by
necessisity.</DIV>
<DIV> </DIV>
<DIV>With the advent of the Pachyderm fuses, we copied full scale size-wise but
with little forethought about cooling. Having a large bucket of dead air up
front in our fatso fuses does nothing for the engine/motor. Slows the plane down
tho.</DIV>
<DIV> </DIV>
<DIV>And BTW, the exit really doesn't need to have 3X the entry area to be
effective if properly designed to draw the air out. Remember Bernoulli?? </DIV>
<DIV> </DIV>
<DIV>On the other hand, with so many of us having stopped building, where's the
creativity and innovation going to come from? It saddens me to see a whole new
generation of "modelers" who only want to fly, using ready made everything. It
does produce wonderful piloting skill tho.</DIV>
<DIV> </DIV>
<DIV>Matt</DIV></FONT></BODY></HTML>
<table><tr><td bgcolor=#ffffff><font color=#000000>************************************************************************<br>
*PLEASE NOTE* This email and any attachments may<br>
be confidential. If received in error, please delete all <br>
copies and advise the sender. The reproduction or <br>
dissemination of this email or its attachments is <br>
prohibited without the consent of the sender.<br>
<br>
WARNING RE VIRUSES: Our computer systems sweep<br>
outgoing email to guard against viruses, but no warranty <br>
is given that this email or its attachments are virus free. <br>
Before opening or using attachments, please check for <br>
viruses. Our liability is limited to the re-supply of any <br>
affected attachments.<br>
<br>
Any views expressed in this message are those of the <br>
individual sender, except where the sender expressly,<br>
and with authority, states them to be the views of the <br>
organisation.<br>
************************************************************************<br>
</font></td></tr></table>