<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=US-ASCII">
<META content="MSHTML 6.00.2800.1400" name=GENERATOR></HEAD>
<BODY id=role_body style="FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY: Arial"
bottomMargin=7 leftMargin=7 topMargin=7 rightMargin=7><FONT id=role_document
face=Arial color=#000000 size=2>
<DIV>I am adapting a 30 year old design to a pattern electric. This plane was
designed around the Veco .19. I think I am going to use the E-Flite 450. Total
weight looks to be in the 32 oz range. I just started drawing the motor cowl.
What I am going to try to do is use a very small spinner, possibly 1 1/4, but
make the ring behind the spinner backplate 2" to 2 1/2" diameter. That will
allow air to enter the motor compartment from around the spinner. Another option
I have been considering is 2 cheek scoops!</DIV>
<DIV> </DIV>
<DIV>Terry T.</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>On Sun, 19 Feb 2006 19:48:52 EST <A
href="mailto:Rcmaster199@aol.com">Rcmaster199@aol.com</A> writes:</DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-LEFT: 10px; MARGIN-LEFT: 10px; BORDER-LEFT: #000000 2px solid">
<DIV>
<DIV>It's no big deal to make cutouts in the spinner cone. Just requires
more cereful balance. I've attempted it before on smaller spinners
but wasn't happy with the results (on wet set-ups, and both cooling air flow
wise and strength wise)</DIV>
<DIV> </DIV>
<DIV>Theory sounds good but in practice, don't expect much air flow to
penetrate into the spinner when the motor is running at higher power
output. The ribs that would be needed to still make the spinner functional,
would likely block off air flow. Turbulence that could result, would likely
rob power.</DIV>
<DIV> </DIV>
<DIV>BUT, one way it could work fairly well would be to actually
refashion or bend the ribs in such a shape that air is literaly drawn in and
forced through the spinner. Like a set of impeller vanes. The pitch of the
vanes wouldn't need to be very high. It would rob some power from the motor
though, so the practicality could be questionable. </DIV>
<DIV> </DIV>
<DIV>On the other hand, an optimal pitch angle probably exists and could be
found, that robs the minimum power and provides the maximum cooling air flow
through the spinner. </DIV>
<DIV> </DIV>
<DIV>Matt</DIV>
<DIV> </DIV>
<DIV>In a message dated 2/19/2006 7:28:01 PM Eastern Standard Time,
jshulman@cfl.rr.com writes:</DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><FONT
style="BACKGROUND-COLOR: transparent" face=Arial color=#000000 size=2>I
didn't know they were doing that. Thought they just cut out for the
props<BR>and have the lightened back
plate.<BR><BR>Regards,<BR>Jason<BR>www.jasonshulman.com<BR>www.shulmanaviation.com<BR>www.composite-arf.com<BR><BR>-----Original
Message-----<BR>From:
nsrca-discussion-bounces@lists.nsrca.org<BR>[mailto:nsrca-discussion-bounces@lists.nsrca.org]On
Behalf Of Pat Hewitt<BR>Sent: Sunday, February 19, 2006 7:18 PM<BR>To:
patternrules@earthlink.net; NSRCA Mailing List; NSRCA 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 Turn Spinner for<BR>cooling on an Electric Pattern
Plane not the back plate but the cone itself.<BR><BR>Pat
h.<BR></FONT></BLOCKQUOTE></DIV>
<DIV></DIV>
<DIV> </DIV></FONT>
<DIV> </DIV></BLOCKQUOTE></BODY></HTML>