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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'>Hi Dave,<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'>It seems to me that the electrics are not
turning comparable numbers. Most setups are turning in the low to mid 6000 and
only 1 or 2 set ups are in the 7000 and none in the 8000 that I know of. This
is based on what I have observed only; so there could be a setup turning higher
numbers; and on a 10S battery. If you go to more cells = more Volts = more RPM’s
also more Amps. FAI is caped to 10 cells not sure about AMA. My Hacker A-60 is
on the mid 7000 and we were using the 18.1X10-11-12 glow props; while it flies
very nice with these props the plane is very slow for top classes and or wind.
So right now I’m using an E prop; huge difference. It’s also my
understanding that the E props are more efficient than the regular glow props
not 100% sure but pretty certain about it but you are correct about the stiffer
is more efficient when comparing 2 identical props lets say one plastic and one
carbon but not equal when comparing different airfoils. An APC 20X10 E will be
more efficient than a 20 X10 Glow and if you can make the APC 20X10E in Carbon
it will be more efficient than the original 20X10E etc… Just my
observations. <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'>Ken<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>Dave Burton<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, September 07, 2009
11:04 PM<br>
<b><span style='font-weight:bold'>To:</span></b> '<st1:PersonName w:st="on">General
pattern discussion</st1:PersonName>'<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [NSRCA-discussion]
Electric props vs. standard pattern</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>
<p class=MsoNormal><font size=2 face=Verdana><span style='font-size:10.0pt;
font-family:Verdana'>Why are we using the Electric style APC props on electric
powered pattern planes rather than the standard pattern props? We are turning
the electric motors at comparable RPMs to a glow engine. The standard pattern
props are stiffer and should be more efficient it seems to me. I can understand
a little weight savings if needed but is that the only reason for using the
E-props? What am I missing? Anyone compared similar E and standard props in the
same sizes? What results did you find? <br>
Dave Burton</span></font><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p></o:p></span></font></p>
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