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<DIV>
<DIV>I heard you keep your batteries warm by sticking them in a pretty pink
sock!!! I think Adam told me that,</DIV>
<DIV>but I can't be certain!!!!</DIV>
<DIV> </DIV>
<DIV>Rex</DIV>
<BLOCKQUOTE
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV style="FONT: 10pt arial"><B>From:</B> <A title=mailto:chad@f3acanada.org
href="mailto:chad@f3acanada.org">Chad Northeast</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=mailto:nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, December 19, 2006 9:36
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] Cooling
outrunners</DIV>
<DIV><BR></DIV>Hi Dean<BR><BR>Quite true about the magnets, but I have flown
with my motor at 150F and <BR>on days where it doesnt get above 65F....I can
not tell the difference <BR>in performance, probably because there is such
excess power in these <BR>setups to start with.<BR><BR>Pack temperature on the
other hand is very important, OAT below 10-15C I <BR>have to start restricting
cooling on the batteries or they dont get warm <BR>enough to provide good
power. The new extreme packs are better about <BR>this than the
Prolites, but still very noticeable on certain days.<BR><BR>Chad<BR><BR>Dean
Pappas wrote:<BR>> Bob, you're a genius!<BR>> I suggested this to an
E-powered CL Stunt buddy in the Netherlands <BR>> some months ago because
the Stunt guys have a long history of styling <BR>> planes with chin scoops
placed far back. These often require a 3/4" <BR>> long prop drive extension
to place the cylinder back farther, and the <BR>> use of a short venturi.
They cowl much easier than computer carbs!<BR>> <BR>> Hi
Chad,<BR>> Makes you wonder what some of these guys were thinking when they
<BR>> placed the cooling and cheek inlets. ?? **^^$$!!!<BR>> The inlet
airbox can shroud the aft end of the motor and the sleeve <BR>> dump into a
front exit plenumm. Now the trick is the exit from there. <BR>> I think
that a big elbow like a turbopropo exhaust would be cool, as <BR>> would be
cheek cowls with no entry holes just exits. The exit plenum <BR>> just
behind the spinner would have to duct into the cheeks. Notre that <BR>>
flying without a spinner will wreck the cooling! A row of exhaust <BR>>
stacks like a P-51 could be boxed in and used to suck the warm air out
<BR>> of the exit plenum. I need to draw a picture. That'll take a while,
<BR>> especially around Christmas.<BR>> <BR>> The colder the
magnets are, the stronger they are, and the less <BR>> resistive the copper
is, so cooler is always better for the motor. The <BR>> same is true for
the ESC: MOSFETs are less resistive the cooler they <BR>> are, so
everything gets better in the Antarctic except battery <BR>>
performance.<BR>> <BR>> later,<BR>>
Dean<BR>> <BR>> <BR>><BR>> Dean Pappas<BR>> Sr.
Design Engineer<BR>> Kodeos Communications<BR>> 111 Corporate
Blvd.<BR>> South Plainfield, N.J. 07080<BR>> (908) 222-7817
phone<BR>> (908) 222-2392 fax<BR>> <A title=mailto:d.pappas@kodeos.com
href="mailto:d.pappas@kodeos.com">d.pappas@kodeos.com</A><BR>><BR>>
-----Original Message-----<BR>> *From:* <A
title=mailto:nsrca-discussion-bounces@lists.nsrca.org
href="mailto:nsrca-discussion-bounces@lists.nsrca.org">nsrca-discussion-bounces@lists.nsrca.org</A><BR>>
[mailto:nsrca-discussion-bounces@lists.nsrca.org]*On Behalf
Of<BR>> *Bob
Richards<BR>> *Sent:* Tuesday, December 19, 2006
9:27 AM<BR>> *To:* <A
title=mailto:chad@f3acanada.org
href="mailto:chad@f3acanada.org">chad@f3acanada.org</A>; NSRCA Mailing
List<BR>> *Subject:* Re: [NSRCA-discussion] Cooling
outrunners<BR>><BR>> Is there any reason why you
can't duct the air to blow into the<BR>> rear of
the motor, and provide a way for it to escape from the
front?<BR>> <BR>>
Geez, I'm just thinking that leaving the spinner off, or use
a<BR>> really small spinner, would be the way to
go.<BR>> <BR>> Bob
R.<BR>><BR>><BR>> */Chad Northeast <<A
title=mailto:chad@f3acanada.org%3E/
href="mailto:chad@f3acanada.org>/">chad@f3acanada.org>/</A>*
wrote:<BR>><BR>> The
problem with a lot of composite fuse models
(Twister<BR>> included)
is<BR>> that the inlets in
the chin and cheeks are often right at
the<BR>> rear
or<BR>> even behind an
outrunner.....so ducting toward them is
very<BR>>
difficult.<BR>> I have to
agree that a proper ducting system is crucial
for<BR>> cooling.
I<BR>> use a very simple
short radius 90 bend in a peice of
depron<BR>> that
pulls<BR>> air in from the
chin, I see about a 20C rise in temp
without<BR>> it,
other<BR>> than that I dont
really do anything special. The motor
will<BR>> operate
at<BR>> up to 170F without
complaining so as long as its 20-30F
below<BR>> that
all<BR>> is good
:)<BR>><BR>>
Chad<BR>><BR>>
------------------------------------------------------------------------<BR>><BR>>
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