[NSRCA-discussion] Question.

[Chad Northeast]

Na, I have a Termintor, you would have to really raise the weight limit :)

It drags my 18.5 lb Sukhoi into the stratosphere without a problem....5.5kW on a 24x12 prop :)

Chad

----- Original Message -----
From: Dave <DaveL322 at comcast.net>
Date: Friday, August 20, 2010 8:11 am
Subject: Re: [NSRCA-discussion] Question.
To: 'General pattern discussion' <nsrca-discussion at lists.nsrca.org>

> 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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