[NSRCA-discussion] Question.

[Keith Hoard]

Oh boy, you had to bring up the "S"-word.  Now guys are going to have to
install a liquid helium cooling system for the motor and ESC's. . .

On Fri, Aug 20, 2010 at 9:20 AM, <rcmaster199 at aol.com> wrote:

> If your motor's windings were superconducting, would the current drawn go
> up or down for any given power output? Assume same potential. What else
> would benefit?
>
> MattK
>
>
>  -----Original Message-----
> From: Dave <DaveL322 at comcast.net>
> To: 'General pattern discussion' <nsrca-discussion at lists.nsrca.org>
> Sent: Fri, Aug 20, 2010 10:11 am
> Subject: Re: [NSRCA-discussion] Question.
>
>   Point taken…..
>
> I’ll add some context……in practice, with any reasonably sized electric
> motor for pattern, there is no power limit.
>
> Even if the weight limit were raised…I don’t think you’d see anyone trying
> to run a DA200 or Plett Terminator.
>
> Noise is still the practical limit for both electric and IC…and that limit
> becomes increasingly hard to meet as power increases (with electric or
> glow).
>
> Regards,
>
> Dave
>
>
>
>  ------------------------------
>  *From:* nsrca-discussion-bounces at lists.nsrca.org [
> mailto:nsrca-discussion-bounces at lists.nsrca.org<nsrca-discussion-bounces at lists.nsrca.org?>]
> *On Behalf Of *Chad Northeast
> *Sent:* Friday, August 20, 2010 9:59 AM
> *To:* General pattern discussion
> *Subject:* Re: [NSRCA-discussion] Question.
>
> Dave,
>
> I don't believe that is entirely correct, there is a limit to the amps on
> motors, either through saturation or through losses in the windings.
>
> I am not an expert but what I have been told is there is a point at which
> torque begins to decrease with increasing amps beyond which point your power
> out drops with increasing power in.
>
> So in effect we are "limited"
>
> Chad
>
> ----- Original Message -----
> From: Dave <DaveL322 at comcast.net>
> Date: Friday, August 20, 2010 7:14 am
> Subject: Re: [NSRCA-discussion] Question.
> To: 'General pattern discussion' <nsrca-discussion at lists.nsrca.org>
>
> > "Power" of an IC engine is generally related to
> > displacement...but not
> > exclusively..more RPM at the same displacement equals more power.
> >
> >
> >
> > Electrics are limited on voltage only.there is no limit on amps.both
> > contribute to power, so there is no limit on electrics.
> >
> >
> >
> > The limiting factor in pattern is really the noise limit, for
> > both IC and
> > electric.
> >
> >
> >
> > Regards,
> >
> >
> > Dave
> >
> >
> >
> >
> >
> >
> >
> >   _____
> >
> > From: nsrca-discussion-bounces at lists.nsrca.org
> > [mailto:nsrca-discussion-bounces at lists.nsrca.org<nsrca-discussion-bounces at lists.nsrca.org?>]
> On Behalf Of
> > Tim Taylor
> > Sent: Thursday, August 19, 2010 3:13 PM
> > To: nsrca-discussion at lists.nsrca.org
> > Subject: [NSRCA-discussion] Question.
> >
> >
> >
> >
> > 4. Model Aircraft Requirements:
> >
> > 4.1: Propulsion source limitations: Electrically-powered model
> > aircraft are
> > limited to a maximum of 42.56 volts for the propulsion circuit,
> > measuredprior to flight while the competitor is in the ready
> > box.
> >
> >
> >
> > I see Electrics have a "Displacement" limit, why are they
> > limited and the IC
> > engines not?
> >
> >
> >
> > I also see they must be checked in the ready box prior to each flight,
> > anyone ever have this check done? Even at the worlds?
> >
> >
> >
> > Or is this another ignored rule?
> >
> >
> >
> > Tim
> >
> >
> >
> >
>
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>
>
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-- 

Keith Hoard
Collierville, TN
khoard at gmail.com
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