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<DIV>Hi Dean, I agree with your assessment. The point is of course that the things you suggest are much easier and lighter to do in electric than on model engines, producing a more effective package overall. I am assuming that battery weight will come down over the next couple years, based on very new developments I am aware of.</DIV>
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<DIV>Engine technology has progressed to the present offerings over the past 65-70 years or so since the glow plug. Sure there have been advances in specific power, improvements in carburation and fuel delivery. New improvements will likely be of an incremental nature rather than fundamental nature and are likely to be smaller and smaller in the future. The point of diminishing returns was reached long ago.</DIV>
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<DIV>The electric movement offers a whole 'nother way of looking at the power delivery to the prop(or wheels in a full sized car for that matter), and opportunities for fundamental advancement abound. Exciting times, limited only by the cleverness of its inventors. I am really looking forward to the time where fuel cells will be powering our models. That wouldn't be a bad project to work on.</DIV>
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<DIV>MattK</DIV>
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<DIV><SPAN class=326065015-17092004><FONT size=2>Hi Matt,</FONT></SPAN></DIV>
<DIV><SPAN class=326065015-17092004><FONT size=2>I suspect that you're right, even if the timeframe is a little longer. Some pieces of hardware are still lacking. The first among these is a speed controller that offers braking. Probably the easiest way to do this is to make the controller so that stick position actually controls the motor RPM, and then mess with the timing to get braking when the RPM is above the target. The potential for slow downlines is staggering. For the geared motors, an RPM limit would also allow the selection of a lower resistance , higher Kv, winding and corresponding change in prop or gear ratio that would overspeed the motor under a W.O.T. dive, but will improve efficiency everywhere else. </FONT></SPAN></DIV>
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<DIV><SPAN class=326065015-17092004><FONT size=2>just some ramblings,</FONT></SPAN></DIV>
<DIV><SPAN class=326065015-17092004><FONT size=2> Dean</FONT></SPAN></DIV>
<P><FONT size=2><FONT face="Times New Roman">Dean Pappas</FONT> <BR><FONT face="Times New Roman">Sr. Design Engineer</FONT> <BR><FONT face="Times New Roman">Kodeos Communications</FONT> <BR><FONT face="Times New Roman">111 Corporate Blvd.</FONT> <BR><FONT face="Times New Roman">South Plainfield, N.J. 07080</FONT> <BR><FONT face="Times New Roman">(908) 222-7817 phone</FONT> <BR><FONT face="Times New Roman">(908) 222-2392 fax</FONT> <BR><FONT face="Times New Roman">d.pappas@kodeos.com</FONT> </FONT></P>
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<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma size=2>-----Original Message-----<BR><B>From:</B> discussion-request@nsrca.org [mailto:discussion-request@nsrca.org]<B>On Behalf Of </B>Rcmaster199@aol.com<BR><B>Sent:</B> Friday, September 17, 2004 1:13 AM<BR><B>To:</B> discussion@nsrca.org<BR><B>Subject:</B> Re: Motor Costs Comparison (more pro-electric)<BR><BR></FONT></DIV>
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<DIV><FONT size=2>John there are at least a couple more good points:</FONT></DIV>
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<DIV><FONT size=2>Throttle response of an electric can be made more effective compared to most engines, even many four strokes. You don't get the wind up on downlines like you do on 2 strokes, and you don't need to wait until the 2 stroker settles down on landing</FONT></DIV>
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<DIV><FONT size=2>I doubt we will ever have to worry about the motor "flaming out" on take-off, 10 feet off the deck in no man's land, even if one cell drops. Or the motor going fat or lean and flaming out somewhere in the flight.</FONT></DIV>
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<DIV><FONT size=2>There are many more good points to be made. It makes sense for pattern even if initial cost or the cost per flight is prohibitive for many right now. Consider the afforementioned flame-out on take off, or flame out on landing approach that got a little too far away. A cracked pattern plane is often the result of either condition. </FONT></DIV>
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<DIV><FONT size=2>I still hold to a statement I made more than a year ago: in five years more than half of us will be flying electric</FONT></DIV>
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<DIV><FONT size=2>MattK</FONT></DIV></DIV></BLOCKQUOTE></BLOCKQUOTE></DIV>
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