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<DIV>
<DIV>It's my understanding that some of the companies are installing cooling
fans in the new outrunner motors. I believe I heard that Plettenberg is
doing this to all the new 30-10's and the new wind motor they are
building....</DIV>
<DIV> </DIV>
<DIV>Rex</DIV>
<BLOCKQUOTE
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="FONT: 10pt arial"><B>From:</B> <A title=mailto:geobet@gis.net
href="mailto:geobet@gis.net">George Kennie</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=mailto:chad@f3acanada.org
href="mailto:chad@f3acanada.org">chad@f3acanada.org</A> ; <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> Monday, February 20, 2006 1:22
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] Electric
TT Spinner</DIV>
<DIV><BR></DIV>After seeing some guy at the Worlds with an outrunner hanging
out in the breeze<BR>off of the nose ring former, I have ever since wondered
why some manufacturer<BR>doesn't fabricate an outrunner with the shell of the
motor in the shape of a<BR>spinner with cooling holes around the nose area and
exits out the back and through<BR>the nose former. Wouldn't be all that tough
to do.<BR>Sounds like a neat project for Eric and his Shureline
!???<BR><BR>Chad Northeast wrote:<BR><BR>> I have flown without the spinner
to evaluate cooling, its a fairly<BR>> significant change but the
appearance offset the cooling :) I also<BR>> experimented with some
cutouts which may be where the original post came<BR>> from? They
were on the sides of the cone and more or less ineffective<BR>> (no real
surprise, but I wanted to try anyways). I also milled the TT<BR>>
light backplate to act as a fan of sorts, but the RPM is way too low
for<BR>> it to efficiently put air through. I spoke with Plettenberg
about fans,<BR>> they have also done testing and indicated that for their
heli stuff you<BR>> need to have the fan spinning 10k-20k rpm to get any
effect out of it.<BR>><BR>> That being said, properly done the motors
can run within limits with a<BR>> full spinner. 160F and lower on the
can measured after a flight is ok.<BR>><BR>> We have other ideas to duct
air into the fuse such as smaller spinners<BR>> and annular gaps that scoop
the air and force it over the can....but<BR>> that is much more complicated
and requires some fiberglass work, and<BR>> mods to the
plane.<BR>><BR>> Chad<BR>><BR>> Keith Black wrote:<BR>><BR>>
> My question is, other than looks, what is the purpose of a spinner
an<BR>> > electric pattern plane?<BR>> ><BR>> > - Reducing
drag isn't a concern as recent designs are being built to<BR>> > be more
draggy.<BR>> > - Starters aren't used with electrics so having a nose
cone isn't<BR>> > necessary for starting.<BR>> ><BR>> > The
only thing I can think of is to clean the air flow and reduce<BR>> >
turbulence from the blunt nose so air going around the fuse and over<BR>>
> the wings is smoother, however, with the prop chewing the air so
close<BR>> > to the nose of the plane I'm not sure this is
significant.<BR>> ><BR>> > Opinions?<BR>> ><BR>> >
Keith Black<BR>> ><BR>> > ----- Original
Message -----<BR>> > *From:* Terry Terrenoire
<<A title=mailto:amad2terry@juno.com
href="mailto:amad2terry@juno.com">mailto:amad2terry@juno.com</A>><BR>>
> *To:* <A
title=mailto:nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</A><BR>>
> <<A
title=mailto:nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">mailto:nsrca-discussion@lists.nsrca.org</A>><BR>>
> *Sent:* Sunday, February 19, 2006 7:22 PM<BR>>
> *Subject:* Re: [NSRCA-discussion] Electric TT
Spinner<BR>> ><BR>> > I am adapting a 30
year old design to a pattern electric. This<BR>>
> plane was designed around the Veco .19. I think I
am going to use<BR>> > the E-Flite 450. Total
weight looks to be in the 32 oz range. I<BR>> >
just started drawing the motor cowl. What I am going to try to do<BR>>
> is use a very small spinner, possibly 1 1/4, but
make the ring<BR>> > behind the spinner
backplate 2" to 2 1/2" diameter. That will<BR>>
> allow air to enter the motor compartment from
around the spinner.<BR>> > Another option I have
been considering is 2 cheek scoops!<BR>> ><BR>>
> Terry T.<BR>> ><BR>> ><BR>>
> On Sun, 19 Feb 2006 19:48:52 EST <A
title=mailto:Rcmaster199@aol.com
href="mailto:Rcmaster199@aol.com">Rcmaster199@aol.com</A><BR>>
> <<A title=mailto:Rcmaster199@aol.com
href="mailto:Rcmaster199@aol.com">mailto:Rcmaster199@aol.com</A>>
writes:<BR>> ><BR>>
> It's no big deal to make
cutouts in the spinner cone. Just<BR>>
> requires more cereful
balance. I've attempted it before on<BR>>
> smaller spinners but
wasn't happy with the results (on wet<BR>>
> set-ups, and both cooling
air flow wise and strength wise)<BR>> ><BR>>
> Theory sounds good but in
practice, don't expect much air flow<BR>>
> to penetrate into the
spinner when the motor is running<BR>>
> at higher power output.
The ribs that would be needed to still<BR>>
> make the spinner
functional, would likely block off air flow.<BR>>
> Turbulence that could
result, would likely rob power.<BR>> ><BR>>
> BUT, one way it could
work fairly well would be to actually<BR>>
> refashion or bend the
ribs in such a shape that air is<BR>>
> literaly drawn in and
forced through the spinner. Like a set<BR>>
> of impeller vanes. The
pitch of the vanes wouldn't need to be<BR>>
> very high. It would rob
some power from the motor though, so<BR>>
> the practicality could be
questionable.<BR>> ><BR>>
> On the other hand, an
optimal pitch angle probably exists and<BR>>
> could be found, that robs
the minimum power and provides the<BR>>
> maximum cooling air flow
through the spinner.<BR>> ><BR>>
> Matt<BR>> ><BR>>
> In a message dated
2/19/2006 7:28:01 PM Eastern Standard Time,<BR>>
> <A
title=mailto:jshulman@cfl.rr.com
href="mailto:jshulman@cfl.rr.com">jshulman@cfl.rr.com</A> writes:<BR>>
><BR>>
> I
didn't know they were doing that. Thought they just cut<BR>>
>
out for the props<BR>>
>
and have the lightened back plate.<BR>> ><BR>>
>
Regards,<BR>>
>
Jason<BR>>
>
<A title=http://www.jasonshulman.com/
href="http://www.jasonshulman.com">www.jasonshulman.com</A><BR>>
>
<A title=http://www.shulmanaviation.com/
href="http://www.shulmanaviation.com">www.shulmanaviation.com</A><BR>>
>
<A title=http://www.composite-arf.com/
href="http://www.composite-arf.com">www.composite-arf.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<BR>>
>
Of Pat Hewitt<BR>>
>
Sent: Sunday, February 19, 2006 7:18 PM<BR>>
>
To: <A title=mailto:patternrules@earthlink.net
href="mailto:patternrules@earthlink.net">patternrules@earthlink.net</A>; NSRCA
Mailing List; NSRCA<BR>>
>
Mailing List<BR>>
>
Subject: Re: [NSRCA-discussion] Electric TT Spinner<BR>> ><BR>>
><BR>>
>
Please advise,<BR>> ><BR>>
>
What are some of your thoughts on the cut outs of a True<BR>>
>
Turn Spinner for<BR>>
>
cooling on an Electric Pattern Plane not the back plate<BR>>
>
but the cone itself.<BR>> ><BR>>
>
Pat h.<BR>> ><BR>> ><BR>> ><BR>> ><BR>>
>
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><BR>>
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