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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'>Don,<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'>Some basics –<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'>10s1p 5000 = 10 cell battery pack
configured with 10 cells in series (increases voltage) and capacity of 5000 mah
(peak voltage would 42 volts, for lipos).<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'>10s2p 5000 = 20 cell battery pack
configured with groups of 2 cells in parallel (increases capacity) and 10
groups of 2 in series. Same capacity and voltage (using 20 smaller cells
of 2500 mah capacity each).<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'>The vast majority of F3A planes are using
10s configurations (for maximum allowable voltage of 42). Capacity ranges
anywhere from about 3850 to 5300 mah, and this is done with 1p, 2p, 3p, and 4p
configurations. Given equal power levels and flight times, larger
capacity packs will provide more consistent power through the flight and have
much longer cycle longevity. Many time guys will use 2 5s1p5000 packs to
fly F3A – they will plug the packs into the controller in series, so the controller
is “seeing” 10s1p 5000.<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'>C on the controller is short for Cells (C),
and when paired with a number, it is indicating how many cells in series that
the controller can handle.<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'>C on the batteries is short for Capacity,
and when paired with a number, generally refers to the rate at which a battery
can be charged or discharged. A 5000 mah battery rated at 1C charge and
10C discharge could be charged at a maximum rate of 5000 mah (5 amps) and discharged
at a maximum rate of 50,000 mah (50 amps). I won’t even go into
various discharge ratings – such as average, continuous, peak, burst,
etc. Suffice to say the lower the discharge rate, the more cycles the
pack will likely see. Most F3A setups are going to see between 12 and 18C
peak current (60 to 90 amps for 5000 mah capacity packs) with average current in
flight of around 6 to 8C (30 to 40 amps).<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'>There is a ton of info on the various
forums on RCU, RCGroups, etc.<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'>Regards,<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'><br>
Dave Lockhart<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'><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>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
nsrca-discussion-bounces@lists.nsrca.org [mailto:nsrca-discussion-bounces@lists.nsrca.org]
<b><span style='font-weight:bold'>On Behalf Of </span></b>Don Filteau<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, December 04, 2008
11:57 PM<br>
<b><span style='font-weight:bold'>To:</span></b>
nsrca-discussion@lists.nsrca.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> [NSRCA-discussion]
Electric F3a Batteries</span></font><o:p></o:p></p>
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<p class=MsoNormal><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><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hi People</span></font><o:p></o:p></p>
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<p class=MsoNormal><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><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I am looking at getting an electric motor, but I do not
understand what battery I can use. The one Speed Controller
states: 2 -6 lipo cells and the other states 2-12 lipo cells. But when I
look at batteries it states: 3C or 2C. I think that means
cell. Which controller size should I look at? What size
of packs are people flying in their planes? Are people hooking up more
than one pack? </span></font><o:p></o:p></p>
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<p class=MsoNormal><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><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thanks Don Filteau</span></font><o:p></o:p></p>
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