[NSRCA-discussion] Question.

[rcmaster199 at aol.com]

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] 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] 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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