<!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 6.00.2900.3020" name=GENERATOR></HEAD>
<BODY>
<DIV><SPAN class=252015714-19122006><FONT face=Arial color=#0000ff size=2>Bob,
you're a genius!</FONT></SPAN></DIV>
<DIV><SPAN class=252015714-19122006><FONT face=Arial color=#0000ff size=2>I
suggested this to an E-powered CL Stunt buddy in the Netherlands some months
ago because the Stunt guys have a long history of styling planes with chin
scoops placed far back. These often require a 3/4" long prop drive extension to
place the cylinder back farther, and the use of a short venturi. They cowl much
easier than computer carbs!</FONT></SPAN></DIV>
<DIV><SPAN class=252015714-19122006><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=252015714-19122006><FONT face=Arial color=#0000ff size=2>Hi
Chad,</FONT></SPAN></DIV>
<DIV><SPAN class=252015714-19122006><FONT face=Arial color=#0000ff size=2>Makes
you wonder what some of these guys were thinking when they placed the cooling
and cheek inlets. ?? **^^$$!!!</FONT></SPAN></DIV>
<DIV><SPAN class=252015714-19122006><FONT face=Arial color=#0000ff size=2>The
inlet airbox can shroud the aft end of the motor and the sleeve dump into a
front exit plenumm. Now the trick is the exit from there. I think that a big
elbow like a turbopropo exhaust would be cool, as would be cheek cowls
with no entry holes just exits. The exit plenum just behind the spinner
would have to duct into the cheeks. Notre that flying without a spinner will
wreck the cooling! A row of exhaust stacks like a P-51 could be boxed in and
used to suck the warm air out of the exit plenum. I need to draw a picture.
That'll take a while, especially around Christmas.</FONT></SPAN></DIV>
<DIV><SPAN class=252015714-19122006><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=252015714-19122006><FONT face=Arial color=#0000ff size=2>The
colder the magnets are, the stronger they are, and the less resistive the copper
is, so cooler is always better for the motor. The same is true for the ESC:
MOSFETs are less resistive the cooler they are, so everything gets better in the
Antarctic except battery performance.</FONT></SPAN></DIV>
<DIV><SPAN class=252015714-19122006><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=252015714-19122006><FONT face=Arial color=#0000ff
size=2>later,</FONT></SPAN></DIV>
<DIV><SPAN class=252015714-19122006><FONT face=Arial color=#0000ff
size=2> Dean</FONT></SPAN></DIV>
<DIV><SPAN class=252015714-19122006><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV> </DIV>
<P><FONT face="Times New Roman">Dean Pappas</FONT> <BR><FONT
face="Times New Roman">Sr. Design Engineer</FONT> <BR><FONT
face="Times New Roman">Kodeos Communications</FONT> <BR><FONT
face="Times New Roman">111 Corporate Blvd.</FONT> <BR><FONT
face="Times New Roman">South Plainfield, N.J. 07080</FONT> <BR><FONT
face="Times New Roman">(908) 222-7817 phone</FONT> <BR><FONT
face="Times New Roman">(908) 222-2392 fax</FONT> <BR><FONT
face="Times New Roman">d.pappas@kodeos.com</FONT> </P>
<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>
nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org]<B>On Behalf Of </B>Bob
Richards<BR><B>Sent:</B> Tuesday, December 19, 2006 9:27 AM<BR><B>To:</B>
chad@f3acanada.org; NSRCA Mailing List<BR><B>Subject:</B> Re:
[NSRCA-discussion] Cooling outrunners<BR><BR></FONT></DIV>
<DIV>Is there any reason why you can't duct the air to blow into the rear of
the motor, and provide a way for it to escape from the front?</DIV>
<DIV> </DIV>
<DIV>Geez, I'm just thinking that leaving the spinner off, or use a really
small spinner, would be the way to go.</DIV>
<DIV> </DIV>
<DIV>Bob R.</DIV>
<DIV><BR><BR><B><I>Chad Northeast <chad@f3acanada.org></I></B>
wrote:</DIV>
<BLOCKQUOTE class=replbq
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">The
problem with a lot of composite fuse models (Twister included) is <BR>that
the inlets in the chin and cheeks are often right at the rear or <BR>even
behind an outrunner.....so ducting toward them is very difficult. <BR>I have
to agree that a proper ducting system is crucial for cooling. I <BR>use a
very simple short radius 90 bend in a peice of depron that pulls <BR>air in
from the chin, I see about a 20C rise in temp without it, other <BR>than
that I dont really do anything special. The motor will operate at <BR>up to
170F without complaining so as long as its 20-30F below that all <BR>is good
:)<BR><BR>Chad<BR><BR></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>