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<DIV><FONT face=Arial size=2>Vincente, I fly FAI. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I am keeping records on every
flight: battery capacity used, starting and terminal
voltages, and temps on battery, speed control and motor.
Also I am watching individual cell voltages to see how they stay perform.
Obviously I check max current periodically.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I have the same concerns as everyone on the
list about battery longevity. Performance seems to be
there for major brands (at least initially) so I don't see that as a
big issue. I am interested in a battery pack design and battery
maintenance system that enhances overall life. Matched
cells would seem to have a better chance than non-matched cells
since no cell gets over/under charged or discharged.
Monitoring individual cell voltages provides clues to how the cells
are performing relative to each other. I don't like the idea of
simply monitoring total pack voltages -- leaves a lot of uncertainty about what
is actually going on. However, final proof will be
in the cycles. My view is that we are still have a lot of
flying to do (hundreds of cycles on many battery sets ) before
any firm conclusions can be made. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I fully support Earl Haury's approach -- look at
the data. His Partner is fully instrumented with inflight data
logger for continuous voltages, motor current draw, air speed, and
full GPS data including altitude for all maneuvers. He has the data
to understand and compare performance. We need facts like this
to understand where to go.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>One other thing I have noticed is that managing
(forcing) air flow over the motor and speed controller can make 20 to 30
degrees difference from an un-baffled system. I made formed
ducts out of depron foam and have never gotten higher than 115 degrees even
on long, demanding flights. I have seen 140 plus degrees on the same
design airplane with simple cowl inlets with no ducts. However,
airflow over the batteries does not seem critical with the new
generation, low impedance batteries -- the before and after
temps are very nearly the same without much airflow.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Ron Barr</FONT></DIV>
<DIV><FONT face=Arial size=2>AMA 6507</FONT></DIV>
<DIV><FONT face=Arial size=2>Team Futaba</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=vicenterc@comcast.net href="">vicenterc@comcast.net</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org href="">NSRCA Mailing List</A> ; <A
title=nsrca-discussion@lists.nsrca.org href="">NSRCA Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Cc:</B> <A title=rsbxon@ev1.net href="">Ron
Barr</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, March 31, 2006 9:50
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] Falcon
F3A batteries</DIV>
<DIV><BR></DIV>
<DIV>Ron,</DIV>
<DIV> </DIV>
<DIV>What class you fly? Please keep statistics and let us know the
number of cycles you get in the future.</DIV>
<DIV> </DIV>
<DIV>Vicente Bortone</DIV>
<DIV> </DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">--------------
Original message -------------- <BR>From: "Ron Barr" <<A
href="">rsbxon@ev1.net</A>> <BR><BR>> Sorry that I am a little late in
responding .... <BR>> <BR>> I am also using these batteries by Falcon.
I have 2 sets and have about 20 <BR>> flights on them. I am pleased with
the performance so far. I am flying <BR>> them in a 10 pound 12 oz
Genesis that I built from a CA kit (Hacker C50XL13 <BR>> motor).
<BR></BLOCKQUOTE></BLOCKQUOTE></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=vicenterc@comcast.net
href="mailto:vicenterc@comcast.net">vicenterc@comcast.net</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> ; <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>Cc:</B> <A title=rsbxon@ev1.net
href="mailto:rsbxon@ev1.net">Ron Barr</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, March 31, 2006 9:50
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] Falcon
F3A batteries</DIV>
<DIV><BR></DIV>
<DIV>Ron,</DIV>
<DIV> </DIV>
<DIV>What class you fly? Please keep statistics and let us know the
number of cycles you get in the future.</DIV>
<DIV> </DIV>
<DIV>Vicente Bortone</DIV>
<DIV> </DIV>
<BLOCKQUOTE
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Original message -------------- <BR>From: "Ron Barr" <<A
href="mailto:rsbxon@ev1.net">rsbxon@ev1.net</A>> <BR><BR>> Sorry that
I am a little late in responding .... <BR>> <BR>> I am also using
these batteries by Falcon. I have 2 sets and have about 20 <BR>> flights
on them. I am pleased with the performance so far. I am flying <BR>> them
in a 10 pound 12 oz Genesis that I built from a CA kit (Hacker C50XL13
<BR>> motor). <BR>> <BR>> I am impressed with the overall concept
of exactly matching cells: <BR>> Capacity, Impedence and voltage. The
batteries come with a "pedigree" to <BR>> certify that the cells are
matched. I also purchased the available voltage <BR>> checker to allow
monitoring of each cell set. Also there is a balancer <BR>> available to
balance the cells. So far the balancer has not been needed to <BR>> any
great extent. The voltage checker allows you to monitor individual cell
<BR>>sday, March 30, 2006 6:32 AM <BR>> Subject: [NSRCA-discussion]
Falcon F3A batteries <BR>> <BR>> <BR>> > Is anyone using the
Falcon F3A cells advertised in the K-Factor? Is there <BR>> > any
track record behind them? <BR>> > Thanks, <BR>> > Stuart
<BR>> > <BR>> > <BR>> >
_______________________________________________ <BR>> >
NSRCA-discussion mailing list <BR>> > NSRCA-discussion@lists.nsrca.org
<BR>> > http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
<BR>> > <BR>> > <BR>> <BR>> <BR>>
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mailing list <BR>> NSRCA-discussion@lists.nsrca.org <BR>>
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