[NSRCA-discussion] Electric TT Spinner
JShulman
jshulman at cfl.rr.com
Mon Feb 20 17:53:35 AKST 2006
Bernd Beschorner had his Pletty mounted in the nose of his Impact. Not sure
if one can purchase it that way, but it sure looks cool with a Gatling Gun
in your spinner...lol.
Regards,
Jason
www.jasonshulman.com
www.shulmanaviation.com
www.composite-arf.com
-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of George
Kennie
Sent: Monday, February 20, 2006 4:23 PM
To: chad at f3acanada.org; NSRCA Mailing List
Subject: Re: [NSRCA-discussion] Electric TT Spinner
After seeing some guy at the Worlds with an outrunner hanging out in the
breeze
off of the nose ring former, I have ever since wondered why some
manufacturer
doesn't fabricate an outrunner with the shell of the motor in the shape of a
spinner with cooling holes around the nose area and exits out the back and
through
the nose former. Wouldn't be all that tough to do.
Sounds like a neat project for Eric and his Shureline !???
Chad Northeast wrote:
> I have flown without the spinner to evaluate cooling, its a fairly
> significant change but the appearance offset the cooling :) I also
> experimented with some cutouts which may be where the original post came
> from? They were on the sides of the cone and more or less ineffective
> (no real surprise, but I wanted to try anyways). I also milled the TT
> light backplate to act as a fan of sorts, but the RPM is way too low for
> it to efficiently put air through. I spoke with Plettenberg about fans,
> they have also done testing and indicated that for their heli stuff you
> need to have the fan spinning 10k-20k rpm to get any effect out of it.
>
> That being said, properly done the motors can run within limits with a
> full spinner. 160F and lower on the can measured after a flight is ok.
>
> We have other ideas to duct air into the fuse such as smaller spinners
> and annular gaps that scoop the air and force it over the can....but
> that is much more complicated and requires some fiberglass work, and
> mods to the plane.
>
> Chad
>
> Keith Black wrote:
>
> > My question is, other than looks, what is the purpose of a spinner an
> > electric pattern plane?
> >
> > - Reducing drag isn't a concern as recent designs are being built to
> > be more draggy.
> > - Starters aren't used with electrics so having a nose cone isn't
> > necessary for starting.
> >
> > The only thing I can think of is to clean the air flow and reduce
> > turbulence from the blunt nose so air going around the fuse and over
> > the wings is smoother, however, with the prop chewing the air so close
> > to the nose of the plane I'm not sure this is significant.
> >
> > Opinions?
> >
> > Keith Black
> >
> > ----- Original Message -----
> > *From:* Terry Terrenoire <mailto:amad2terry at juno.com>
> > *To:* nsrca-discussion at lists.nsrca.org
> > <mailto:nsrca-discussion at lists.nsrca.org>
> > *Sent:* Sunday, February 19, 2006 7:22 PM
> > *Subject:* Re: [NSRCA-discussion] Electric TT Spinner
> >
> > 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!
> >
> > Terry T.
> >
> >
> > On Sun, 19 Feb 2006 19:48:52 EST Rcmaster199 at aol.com
> > <mailto:Rcmaster199 at aol.com> writes:
> >
> > 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)
> >
> > 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.
> >
> > 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.
> >
> > 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.
> >
> > Matt
> >
> > In a message dated 2/19/2006 7:28:01 PM Eastern Standard Time,
> > jshulman at cfl.rr.com writes:
> >
> > I didn't know they were doing that. Thought they just cut
> > out for the props
> > and have the lightened back plate.
> >
> > Regards,
> > Jason
> > www.jasonshulman.com
> > www.shulmanaviation.com
> > www.composite-arf.com
> >
> > -----Original Message-----
> > From: nsrca-discussion-bounces at lists.nsrca.org
> > [mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf
> > Of Pat Hewitt
> > Sent: Sunday, February 19, 2006 7:18 PM
> > To: patternrules at earthlink.net; NSRCA Mailing List; NSRCA
> > Mailing List
> > Subject: Re: [NSRCA-discussion] Electric TT Spinner
> >
> >
> > Please advise,
> >
> > What are some of your thoughts on the cut outs of a True
> > Turn Spinner for
> > cooling on an Electric Pattern Plane not the back plate
> > but the cone itself.
> >
> > Pat h.
> >
> >
> >
> >
>
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