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<DIV>I actually looked at doing that... After I put the small spinner on,
I decided it was butt ugly and wasn't about to be caught in public with it</DIV>
<DIV>like that.... LOL </DIV>
<DIV>I have a ramp built into the chin cowl that diverts the air up to right
behind the motor, then flows through the battery tray. After carving the
</DIV>
<DIV>spinner and backplate, the motor temps went down. In the hot weather,
say around 100F+, I noticed sometimes that I was beginning to have a </DIV>
<DIV>few power problems. I also noticed that these power problems were
coming in outside, push manuevers... I figured it might have something
more to do with airflow through the fuselage, so I increased the air outlet in
the bottom of the fuselage(doubled the size). All of the cooling problems
</DIV>
<DIV>went away, and I noticed that the overall temps went down
considerably. I probably made 20-30 flights after that in the heat
and had no temp </DIV>
<DIV>problems. Since then, I have installed the curved "tounge" like
Chad uses, to divert air directly onto the motor can. I'm guessing I'll
have no temperature problems at all now, but I'll have to wait till June to find
out.</DIV>
<DIV>Flying electrics is like wine, they get better with time!!!!</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 9:29
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] Cooling
outrunners</DIV>
<DIV><BR></DIV>We actually asked ZN about producing an add-on piece to do just
that on <BR>the Twister while at the Worlds in France. They were
concerned about <BR>making a composite piece that small strong enough so it
never really <BR>went past discussion.<BR><BR>Dez however, did run a smaller
spinner on his motor for a while. IIRC <BR>it made a small difference to
the temperature but not enough to overcome <BR>the decreased aesthetics
:)<BR><BR>The motors are around 2.25" OD, spinners up around 3.25"+, so even
<BR>dropping down to a 2.75" spinner still provides a lot of blockage to the
<BR>motor can.<BR><BR>Chad<BR><BR><A title=mailto:Rcmaster199@aol.com
href="mailto:Rcmaster199@aol.com">Rcmaster199@aol.com</A> wrote:<BR>> One
way this could be done is to allow enough annular room around the <BR>>
spinner, completely bypassing the cheeks and chin. You only need about
<BR>> 1/8" annular opening. Just use a smaller spinner than needed and
<BR>> fashion the model nose to recess the spinner slightly into the
annulus.<BR>> <BR>> I have done that on Temptress (engine powered)
with good results.<BR>> <BR>> Use the cheeks and chin to route air
to the bats.<BR>> <BR>> MattK<BR>> <BR>> In a message
dated 12/19/2006 9:28:10 AM Eastern Standard Time, <BR>> <A
title=mailto:bob@toprudder.com
href="mailto:bob@toprudder.com">bob@toprudder.com</A>
writes:<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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