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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>In regards to the airframe, I am agreeing
with you in a sense that the planes will e-<span class=SpellE>volve</span>
(grin) to be able to compliment the electric setups.<span
style='mso-spacerun:yes'> </span>Right now we are adapting current IC
airframes.<span style='mso-spacerun:yes'> </span>The advantages of
“braking” with the controllers and larger props may see another
swing in basic design concepts.<span style='mso-spacerun:yes'>
</span>Look at <span class=SpellE>Nats</span> Voodoo express, now that may be
the extreme end of design compared to the airframes we see now and what we
evolve to but who knows, could a redesigned curare with slim fuse make a come
back???<span style='mso-spacerun:yes'> </span><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Can’t wait to see what comes next.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Chuck<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> discussion-request@nsrca.org
[mailto:discussion-request@nsrca.org] <b><span style='font-weight:bold'>On
Behalf Of </span></b>Richard Strickland<br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, November 18, 2005
11:58 AM<br>
<b><span style='font-weight:bold'>To:</span></b> discussion@nsrca.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: Discussion List
(Batteries)</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Gray, Dean,</span></font><o:p></o:p></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>While my experience wasn't the
greatest--it really wasn't all that bad once we had the bugs worked out.
BTW, it was a Hacker system like Jason's.</span></font><o:p></o:p></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>One of the issues was to determine
how cool the batteries needed to be before putting them back on charge; another
was to make sure you were not over or under charging. Another was to make
sure they were balanced. But for me it came down to weight and
longevity. Contrary to where your information is coming from, my
understanding is that modeling IS driving this battery segment along
with the military. I'm reasonably confident there will be significant
breakthroughs like that nano-tech unit(Toshiba or some other heavy-hitter like
that) posted earlier this year that will impact the market fairly
shortly. The 3200s were under-sized, but 4000s would be also. The
motors would peak out at 67-69 amps on application of full throttle and back
down to the 63-65 range. This system worked well, but we were too close
to the edge to lose any capacity and complete an FAI flight. Temps
started with a 40-50 degree rise when we started using them in the upper
70s and 80s and the same and a little more as ambient got warmer. They
got too hot. We also tend to fly out.</span></font><o:p></o:p></p>
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style='font-size:12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Realistically, if to get decent
mileage out of these things and have to stay close to 10C; then you've got to
have at least 6000s+ and keep the weight down. I know zip about
batteries, except how to design conveyor systems for them, but they almost need
to act like a capacitor--very high charge, discharge rates, and unlimited
cycles with no damage. I can't imagine there aren't MANY folks
working on that concept.</span></font><o:p></o:p></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Of course there are other alternatives--lighter
and/or smaller airframes, different motor, ESC, prop combinations--but if you
want unlimited vertical with 11 lbs--then your're going to draw 55-70 amps.</span></font><o:p></o:p></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Richard</span></font><o:p></o:p></p>
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