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<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>
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<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>
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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=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></BODY></HTML>