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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'>Good info, What airframe are you
planning on using for your “E” setup.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>And yes, I love my 3D Edge 540 foamy with
AXI motor. I have been flying mine at our local football field at night
with lights on!</span></font></p>
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<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> Thursday, November 25, 2004
3:20 AM<br>
<b><span style='font-weight:bold'>To:</span></b> NSRCA<br>
<b><span style='font-weight:bold'>Subject:</span></b> Fw: Fw: Electrics and how
viable.?.. Matt klipped for reposting</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'>Another $ .02 (Observations so
far......)</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'>For a while, 90% of the focus will
be on batteries. A comparison could be made between a single fluid pump
drawing from three different tanks simultaneously--you will get a slight
difference in the amount drawn from each due to friction losses, tubing or pipe
characteristics, length, gravity, etc. If you put the same amount
back in all three each time you refill--eventually you will get an
under/overfill situation. Same thing happens with the cells(I am
surmising). In a heavy charge/discharge cycle, this is
dangerous. That's why cell balancing is so important as they tend to get
out of balance over time. This can be alleviated by individual cell
balancing every so often--if the pack is built to do so. Kind of a large
problem to my way of thinking as there are MANY packs out there that do not
have that capability....and no one is really talking about it. Probably huge
liability issues there.</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'>The good news is several
manufacturers are working on individual cell balancing chargers with
multi-plugs that will do it all as they are charging at maximum rates.(Then
only one required.) One manufacturer thinks he'll have a 20c discharge
rate cell that will allow smaller, lighter packs with possibly
higher charging rates. We'll see. Another has gotten over 700 cycles out
of the pack and apparently still over the arbitrary 85% cap. threshold(or
so I have read).</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'>Several folks are working on new
motors--direct and geared along with some large programmable controllers.
Apparently, most of the problems have been centered on too much draw (too much
prop) that screws up the motor magnets--causes The motor to draw more
than the controller is rated for and blows the controller if it hadn't already been
blown. Evidently if you use the stuff as rated--the systems are fairly
reliable.</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'>Since I decided some time ago to
take the jump--I have built several small park and indoor airplanes. It's
pretty nice to run down to the park at halftime and get in a couple flights and
only miss a few minutes of the second half. The power is there and can be
controlled well. It DOES feel a little like cheating! The
manufacturers are working on ways to get the weight AND the danger out of the
batteries.</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'>The evidence supports that IF the
systems are operated within capacities and balanced properly they will last FAR
longer than 100 cycles. I suspect that once you do it by the numbers--it'll be
like one of those sweet engines that you set at the beginning of the season and
didn't have to touch the rest.</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'>I am holding off until the last
minute to buy power systems as they seem to be changing almost by the
day. I did go ahead and order the first airplane for it, though.
BTW--get one of the indoor 3D jobs and find the local indoor
club--keeping it between the basketball goals will keep the fingers and depth
perception nimble.</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 S.</span></font></p>
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