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<DIV><FONT face=Arial>Thanks, Steve- I picked the Actro 32-3 because I'm going
to use one in my Ion and I therefore knew that it would run on the 5s4p
packs. I picked the prop at the upper end of the Hobby Lobby
range...didn't do the RPM/volt calculation...but if that is true, even with only
only one pack(5S), I'd be pushing 10K rev's ..... My Plettenberg turns about 9K
with 42 Volts. As to the cell count--- at 1.5 volt per cell, 26 nicad
cells is about 39 volts...and since I knew the actro was run in heli's with the
10S setup, I thought that was pretty close.....</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>I'm not trying to be contentious, I'm just trying to learn
how to do these calculations properly in the future. Its all well and good
to say use a proven system, but someone has to "prove" each one as they come
available. I guess I need much more info before I become a
pioneer<G>.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>G</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=patternrules@earthlink.net
href="mailto:patternrules@earthlink.net">Steven Maxwell</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> Tuesday, January 10, 2006 11:22
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> RE: [NSRCA-discussion] Electric
Power Consumption</DIV>
<DIV><BR></DIV>
<DIV>
<DIV> I'm trying to learn some of this also, so take anything I might say
with a grain of salt, I will be using a standard setup this spring that many
have already used.</DIV>
<DIV> From Hobby-Lobby site for Actro 32-3</DIV>
<DIV>
<DIV align=left><FONT face="Verdana, Arial, Helvetica, sans-serif"
color=#ff0000 size=2>For 14-26 cells in propeller models and 28-32 cells in
helicopters. Propeller range is 13" to 18" in diameter. This 3 turn motor has
an RPM/Volt of 555, resistance of 34 mOhm. Maximum efficiency of about 89% in
the 50-95 amp draw range. Power output in the 550-2000 watt
range.</FONT></DIV></DIV>
<DIV> Sounds like you used 5S4P in series 42 volts X <FONT
face=Verdana color=#ff0000>RPM/Volt of 555<FONT color=#000000>=23,310
rpm.</FONT></FONT></DIV>
<DIV><FONT face=Verdana color=#ff0000><FONT color=#000000> I tried to
run a setup on motor calc but there data is so outa date nothing there to use
maybe somehas elecalc to do figures for you.</FONT></FONT></DIV>
<DIV><FONT face=Verdana> The other thing I have found on Hobby Lobby site
is most of the time they talk about cells is to NiMh or NiCd if Lipo's they
generally say so.</FONT></DIV>
<DIV><FONT face=Verdana> </FONT> Hope this will generate some info
and the best of luck.</DIV>
<DIV> Steve Maxwell</DIV></DIV>
<DIV> </DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid">
<DIV style="FONT: 10pt Arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=glmiller3@cox.net href="mailto:glmiller3@cox.net">George Miller</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To: </B><A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A></DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> 1/11/2006 1:32:01 AM </DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [NSRCA-discussion] Electric
Power Consumption</DIV>
<DIV><BR></DIV><FONT size=2>
<DIV><FONT face=Arial size=2>I have a problem with an electric conversion
which while not precisely pattern related, I'm sure will be applicable to
electric pattern problems...so I'll ask it here.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I am trying to convert a Showtime from YS 110 4
cycle power to electric power. After looking around the web, I got an
Actro 32-3 - which is a popular motor for the Ion electric helicopter.
I know that this motor runs well with available ESC's on 5S4P lithium packs,
so I set it up with a 17X12 APC e prop and a 77amp ESC from Hobby
Lobby ( esc and prop recommended on their website).
To make a long story short, the ESC litterally burned up 30 seconds into the
first flight....but BOY WHAT POWER for that 30
seconds<G>!!!</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>OK, so I'm thinking that burning up probably
indicates a problem.....and I start to investigate...I hook up a watts-up to
my Focus II with a Plettenberg 30-10 and a 21X12 APC and it pulls about
65 amps at full throttle on the bench....Then I set up the Showtime and it
tops 75 amps at half throttle!! HMMM, so there is the problem....Now I try
to make changes to decrease the amperage -- larger prop and smaller
prop---no major change, then I tried just using a 5 cell pack cutting
voltage in half...still about the same....so the question is: How do
you adjust the current drawn by an electric motor? Can this set up be
salvaged...Where did I go wrong and how can I avoid this in the future?
</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>TIA for your help and the benefit of your
experience!</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>George</FONT></DIV></FONT></BLOCKQUOTE>
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