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. . .<br><br><div class="gmail_quote">On Fri, Aug 20, 2010 at 9:20 AM, <span dir="ltr"><<a href="mailto:rcmaster199@aol.com">rcmaster199@aol.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div style="font-size: 10pt; color: black; font-family: arial;"><font color="black" face="arial"></font><span style="display: inline-block;"></span>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?</div>
<div style="font-size: 10pt; color: black; font-family: arial;"> </div>
<div style="font-size: 10pt; color: black; font-family: arial;">MattK</div>
<div><br>
</div>
<div><br>
</div>
-----Original Message-----<br>
From: Dave <<a href="mailto:DaveL322@comcast.net" target="_blank">DaveL322@comcast.net</a>><br>
To: 'General pattern discussion' <<a href="mailto:nsrca-discussion@lists.nsrca.org" target="_blank">nsrca-discussion@lists.nsrca.org</a>><br>
Sent: Fri, Aug 20, 2010 10:11 am<br>
Subject: Re: [NSRCA-discussion] Question.<br>
<br>
<div>
<div vlink="purple" link="blue" lang="EN-US">
<div>
<div class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; color: navy; font-family: Arial;">Point taken…..</span></font></div>
<div class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; color: navy; font-family: Arial;"> </span></font></div>
<div class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; color: navy; font-family: Arial;">I’ll add some context……in practice, with any reasonably sized electric motor for pattern, there is no power limit.</span></font></div>
<div class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; color: navy; font-family: Arial;"> </span></font></div>
<div class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; color: navy; font-family: Arial;">Even if the weight limit were raised…I don’t think you’d see anyone trying to run a DA200 or Plett Terminator.</span></font></div>
<div class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; color: navy; font-family: Arial;"> </span></font></div>
<div class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; color: navy; font-family: Arial;">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).</span></font></div>
<div class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; color: navy; font-family: Arial;"> </span></font></div>
<div class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; color: navy; font-family: Arial;">Regards,</span></font></div>
<div class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; color: navy; font-family: Arial;"> </span></font></div>
<div class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; color: navy; font-family: Arial;">Dave</span></font></div>
<div class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; color: navy; font-family: Arial;"> </span></font></div>
<div class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; color: navy; font-family: Arial;"> </span></font></div>
<div class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; color: navy; font-family: Arial;"> </span></font></div>
<div>
<div class="MsoNormal" style="text-align: center;" align="center"><font size="3" face="Times New Roman"><span style="font-size: 12pt;">
<hr size="2" align="center" width="100%">
</span></font></div>
<div class="MsoNormal"><b><font size="2" face="Tahoma"><span style="font-weight: bold; font-size: 10pt; font-family: Tahoma;">From:</span></font></b><font size="2" face="Tahoma"><span style="font-size: 10pt; font-family: Tahoma;"> <a href="mailto:nsrca-discussion-bounces@lists.nsrca.org" target="_blank">nsrca-discussion-bounces@lists.nsrca.org</a> [<a href="mailto:nsrca-discussion-bounces@lists.nsrca.org?" target="_blank">mailto:nsrca-discussion-bounces@lists.nsrca.org</a>] <b><span style="font-weight: bold;">On Behalf Of </span></b>Chad Northeast<br>
<b><span style="font-weight: bold;">Sent:</span></b> Friday, August 20, 2010 9:59 AM<br>
<b><span style="font-weight: bold;">To:</span></b> General pattern discussion<br>
<b><span style="font-weight: bold;">Subject:</span></b> Re: [NSRCA-discussion] Question.</span></font></div>
</div>
<div class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size: 12pt;"> </span></font></div>
<div class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size: 12pt;">Dave,<br>
<br>
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.<br>
<br>
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.<br>
<br>
So in effect we are "limited"<br>
<br>
Chad<br>
<br>
----- Original Message -----<br>
From: Dave <<a href="mailto:DaveL322@comcast.net" target="_blank">DaveL322@comcast.net</a>><br>
Date: Friday, August 20, 2010 7:14 am<br>
Subject: Re: [NSRCA-discussion] Question.<br>
To: 'General pattern discussion' <<a href="mailto:nsrca-discussion@lists.nsrca.org" target="_blank">nsrca-discussion@lists.nsrca.org</a>><br>
<br>
> "Power" of an IC engine is generally related to <br>
> displacement...but not<br>
> exclusively..more RPM at the same displacement equals more power.<br>
> <br>
> <br>
> <br>
> Electrics are limited on voltage only.there is no limit on amps.both<br>
> contribute to power, so there is no limit on electrics.<br>
> <br>
> <br>
> <br>
> The limiting factor in pattern is really the noise limit, for <br>
> both IC and<br>
> electric.<br>
> <br>
> <br>
> <br>
> Regards,<br>
> <br>
> <br>
> Dave<br>
> <br>
> <br>
> <br>
> <br>
> <br>
> <br>
> <br>
> _____ <br>
> <br>
> From: <a href="mailto:nsrca-discussion-bounces@lists.nsrca.org" target="_blank">nsrca-discussion-bounces@lists.nsrca.org</a><br>
> [<a href="mailto:nsrca-discussion-bounces@lists.nsrca.org?" target="_blank">mailto:nsrca-discussion-bounces@lists.nsrca.org</a>] On Behalf Of <br>
> Tim Taylor<br>
> Sent: Thursday, August 19, 2010 3:13 PM<br>
> To: <a href="mailto:nsrca-discussion@lists.nsrca.org" target="_blank">nsrca-discussion@lists.nsrca.org</a><br>
> Subject: [NSRCA-discussion] Question.<br>
> <br>
> <br>
> <br>
> <br>
> 4. Model Aircraft Requirements: <br>
> <br>
> 4.1: Propulsion source limitations: Electrically-powered model <br>
> aircraft are<br>
> limited to a maximum of 42.56 volts for the propulsion circuit, <br>
> measuredprior to flight while the competitor is in the ready <br>
> box. <br>
> <br>
> <br>
> <br>
> I see Electrics have a "Displacement" limit, why are they <br>
> limited and the IC<br>
> engines not?<br>
> <br>
> <br>
> <br>
> I also see they must be checked in the ready box prior to each flight,<br>
> anyone ever have this check done? Even at the worlds?<br>
> <br>
> <br>
> <br>
> Or is this another ignored rule?<br>
> <br>
> <br>
> <br>
> Tim<br>
> <br>
> <br>
> <br>
> </span></font></div>
</div>
</div>
</div>
<div style="font-size: 12px; margin: 0px; color: rgb(0, 0, 0); font-family: Tahoma,Verdana,Arial,Sans-Serif; background-color: rgb(255, 255, 255);"><pre style="font-size: 9pt;"><tt>_______________________________________________ NSRCA-discussion mailing list <a href="mailto:NSRCA-discussion@lists.nsrca.org" target="_blank">NSRCA-discussion@lists.nsrca.org</a> <a href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion" target="_blank">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a> </tt></pre>
</div>
<br>_______________________________________________<br>
NSRCA-discussion mailing list<br>
<a href="mailto:NSRCA-discussion@lists.nsrca.org">NSRCA-discussion@lists.nsrca.org</a><br>
<a href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion" target="_blank">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a><br></blockquote></div><br><br clear="all"><br>-- <br><br>Keith Hoard<br>Collierville, TN<br>
<a href="mailto:khoard@gmail.com">khoard@gmail.com</a><br><br><br>