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<DIV><FONT face=Arial size=2>Bob:</FONT></DIV>
<DIV><FONT face=Arial size=2>I think so too, i.e., there are likely some good
RPM ranges where braking will be more effective and you can grab regen
power to freshen the cells if wanted. I don't think it's a bad idea at
all, it's a great idea. I'm just thinking that it's not a simple problem
to get it optimized and that we have to balance several factors. Just like
everything else we tackle in this hobby, it's what makes it fun to try to do
it.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Ed</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=bob@toprudder.com href="mailto:bob@toprudder.com">Bob Richards</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, February 20, 2006 7:23
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] Electric
vs. Glow</DIV>
<DIV><BR></DIV>
<DIV>Ed,</DIV>
<DIV> </DIV>
<DIV>Ok, I'll buy that. Taken to the extreme, a non-spinning prop will have
less drag than one that is windmilling. I would think that there is a
point where the braking is at a maximum (rpm/mph) and perhaps this would be
free spinning, but my gut tells me there is some amount of resistance that
could be added to the prop before this maximum is reached. And this
point would be different depending on the prop used. This reminds me of the
old 4C vs 2C engines, the 4C is supposed to (does?) have more "braking" in
down lines.</DIV>
<DIV> </DIV>
<DIV>Also, the props we use are not designed for reverse lift -- like a flat
bottom airfoil flying upside down. They may be -- and probably are -- stalled
when trying to add resistance over freewheeling.</DIV>
<DIV> </DIV>
<DIV>Bob R.</DIV>
<DIV><BR><BR><B><I>Ed Alt <ed_alt@hotmail.com></I></B> wrote:</DIV>
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<DIV><FONT face=Arial size=2>Bob:</FONT></DIV>
<DIV><FONT face=Arial size=2>The faster the prop turns in a freewheeling
mode, the more braking effect, so the less load on it from expending energy
into a load, the faster it will turn. When you have an electrical
generator being propelled by some force and the voltage generated from the
windings is not connected to an external load, then no current other than
eddy currents is going to flow in the motor, which ought to be fairly
insignificant. So there is an EMF, but no significant power generated
by the motor windings when being driven by an external mechanical
force when there is an incomplete circuit from the windings into
any external electrical load. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Ed</FONT></DIV>
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