<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:arial, helvetica, sans-serif;font-size:12pt"><DIV>I'm still trying to get my head around windmilling, low idle and higher idle being almost the same for downline speed.</DIV>
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<DIV>I would have thought (from traditional magnetics theory) that there should be some torque (synchronization) derived from the rotating field and the rotating magnets to resist speeding up. Unless the rotating feild is too weak at low RPM and once out of sync the speed increases with little resistance. Thus the question....is it better to have a higher idle (stronger field)?</DIV>
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<DIV>I am assuming that at low RPM both the PWM and the field voltage are lower than at higher RPM.</DIV>
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<DIV>The problem is that theory and actual test data often don't go hand in hand....and not many clock the speed of their planes.<BR></DIV>
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<B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Dave Lockhart <DaveL322@comcast.net><BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> General pattern discussion <nsrca-discussion@lists.nsrca.org><BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Mon, June 20, 2011 3:25:11 PM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: [NSRCA-discussion] More electric newbie questions<BR></FONT><BR>
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<P class=MsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'sans-serif'">Ooopsss…..I meant to respond to your 1), 2), and 4) scenarios……</SPAN></P>
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<P class=MsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'sans-serif'">I haven’t flown the 3) med brake setting on the Jeti…..but yes, it is possible to have too much brake, and then you will have a faster downline speed than just a windmilling prop.</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'sans-serif'"><BR>Dave</SPAN></P>
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<P class=MsoNormal><B><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'sans-serif'">From:</SPAN></B><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'sans-serif'"> nsrca-discussion-bounces@lists.nsrca.org [mailto:nsrca-discussion-bounces@lists.nsrca.org] <B>On Behalf Of </B>colin chariandy<BR><B>Sent:</B> Monday, June 20, 2011 3:20 PM<BR><B>To:</B> General pattern discussion<BR><B>Subject:</B> Re: [NSRCA-discussion] More electric newbie questions</SPAN></P></DIV></DIV>
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<P class=MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'">Dave....so you are saying:</SPAN></P></DIV>
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<P class=MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'">No brake (regardless of idle or windmilling) - approx the same speed on downlines.</SPAN></P></DIV>
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<P class=MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'">Too much brake - faster than idle/no brake?</SPAN></P></DIV>
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<P class=MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'"> </SPAN></P></DIV>
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<P class=MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'">Colin</SPAN></P></DIV>
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<P class=MsoNormal style="MARGIN-BOTTOM: 12pt"><B><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'sans-serif'">From:</SPAN></B><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'sans-serif'"> Dave Lockhart <DaveL322@comcast.net><BR><B>To:</B> General pattern discussion <nsrca-discussion@lists.nsrca.org><BR><B>Sent:</B> Mon, June 20, 2011 1:00:02 PM<BR><B>Subject:</B> Re: [NSRCA-discussion] More electric newbie questions</SPAN></P>
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<P class=MsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'sans-serif'">Using Castle stuff….</SPAN></P>
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<P class=MsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'sans-serif'">1) and 2) definitely not…..the idle RPM is not governed, and will wind up substantially in downlines, RPM will be the same at the end of the downline whether starting at low idle or high idle. I’m not aware of any different behavior on other brands of ESCs.</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'sans-serif'">3) definitely not……wind up in downlines is virtually indistinguishable from using low idle.</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'sans-serif'"> </SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'sans-serif'">Depending on just how many braking parameters you can adjust (which does vary between Castle, Jeti, Schulze, YGE), it is possible to have too much brake…..at a point, the downlines will become faster again when the prop disc is spinning too slowly. I’ve been told that the ideal idle RPM (for maximum braking) can be calculated, but I don’t know anyone that has done this (and I certainly don’t have the knowledge to run the numbers).</SPAN></P>
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<P class=MsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'sans-serif'">Regards,</SPAN></P>
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<P class=MsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'sans-serif'">Dave</SPAN></P>
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<P class=MsoNormal><B><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'sans-serif'">From:</SPAN></B><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'sans-serif'"> nsrca-discussion-bounces@lists.nsrca.org [mailto:nsrca-discussion-bounces@lists.nsrca.org] <B>On Behalf Of </B>colin chariandy<BR><B>Sent:</B> Monday, June 20, 2011 11:44 AM<BR><B>To:</B> NSRCA Mailing List<BR><B>Subject:</B> [NSRCA-discussion] More electric newbie questions</SPAN></P></DIV></DIV>
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<P class=MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'">I can't find any definative reading on this so I have to ask the group.</SPAN></P></DIV>
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<P class=MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'">Which configuration provides the most braking on downlines and approach for landing (Jeti 90 + evo 30-10) :</SPAN></P></DIV>
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<P class=MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'">1) Lowest possible idle</SPAN></P></DIV>
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<P class=MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'">2) Windmilling prop</SPAN></P></DIV>
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<P class=MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'">3) Jeti Med brake</SPAN></P></DIV>
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<P class=MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'">4) Slighlty higher idle</SPAN></P></DIV>
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<P class=MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'">My testing has not been conclusive....just not enough data.</SPAN></P></DIV>
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<P class=MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'">Thanks</SPAN></P></DIV>
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<P class=MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'">Colin.</SPAN></P></DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></DIV></div></body></html>