[NSRCA-discussion] Cooling outrunners

[J.Oddino]

Chad, have you ever discussed this with the Pletty folks.  I guess in their
solution they have the motor in front of the prop and there is no spinner
back plate in front of the motor.  I'd like to use a nose ring mount and it
would be nice to have some trick way of ducting that is somewhat independent
of the airframe.  I'll have to think about it.

Jim O


----- Original Message ----- 
From: "Chad Northeast" <chad at f3acanada.org>
To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
Sent: Friday, December 15, 2006 7:03 PM
Subject: Re: [NSRCA-discussion] Cooling outrunners


> I have played with doing just this, Great Planes makes a plastic cone
> spinner and aluminum backplate for $10 that makes it easy to experiment.
>
> Within the variables of our tests we could determine no significant
> decrease in motor temperature.  Prop and spinner backplate I believe
> while rotating are too restrictive to the flow.
>
> Running without a spinner however has a serious impact in temperatures.
>
> Proper ducting from chin/cheeks into the engine bay can work more than
> well enough to keep the motor at a good temperature.
>
> Chad
>
> J.Oddino wrote:
> > It would seem the best way to cool outrunners that have holes in the
> > case on the end that faces the nose ring, would be to bring air in
> > through the spinner and through holes in the backplate.  Wondering if
> > anyone has really thought about the optimum design.  I can picture
> > internal vanes but perhaps cutting off the nose of the spinner and
> > leaving a big hole would be adequate.  Anyone tried anything like this?
> >
> > Jim O
> > ------------------------------------------------------------------------
> >
> > _______________________________________________
> > NSRCA-discussion mailing list
> > NSRCA-discussion at lists.nsrca.org
> > http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
> _______________________________________________
> NSRCA-discussion mailing list
> NSRCA-discussion at lists.nsrca.org
> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>
>
> -- 
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.5.432 / Virus Database: 268.15.21/589 - Release Date:
12/15/2006 5:10 PM
>
>