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<DIV><FONT face=Arial size=2>As Mike was trying out the new series of props I
happened to be trying the Mejlik 19x10 c.fiber prop on my Aries(Mejlicks are
just a tad pricey, but a lighter prop) and I had similar results. Like
Mike said... don't rely on the tach to dictate how the prop will perform on a
given airframe. The larger prop made my Aries fly sooo much better it is
hard to describe. I was skeptical at first because it tached so low. It
only tached about 7500 rpms. But the way it flew was the proof in the
pudding. I have not had a chance to try the 18.5x9.5W APC but am
looking forward to it.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>FWIW... this is on the OS 1.40 so my
experience with the YS 4 strokes is like...little to none.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Smooth FLying....</FONT></DIV>
<DIV><FONT face=Arial size=2>Wayno</FONT></DIV>
<DIV><FONT face=Arial size=2></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=drmikedds@sbcglobal.net href="mailto:drmikedds@sbcglobal.net">Dr.
Mike Harrison</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> Wednesday, November 15, 2006 7:31
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] APC 18.1
x 10W props</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>Peter,</FONT></DIV>
<DIV><FONT face=Arial size=2>Hi,</FONT></DIV>
<DIV><FONT face=Arial size=2>I am Mike Harrison, I worked with APC to develop
these props. Let me tell you the goal of the prop design. It is to
fly at a moderate to slow constant speed under the noise limit but with good
pulling performance. Therefore, regarding the rpm, the 8000 is about
ideal for that prop, turn it much more and you will be above the noise
limit. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I find it interesting that you determine whether
a prop is adequate by first tacking it. I would think you would fly it
first to see if it was adequate. I would encourage you to do that
first. The OS 140 turns it about the same and it flies very well.
</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>The whole purpose was to develop a prop that
would fly at a deliberate pace at about 150 meters to compete with the
electrics. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>There is also an 18.5x9.5 which I fly and it
turns about 7500 rpm. I like it better than the 18.1x10. I am
working on a 19x9 at the moment.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Good luck</FONT></DIV>
<DIV><FONT face=Arial size=2>Mike</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=pentagon.systems@bigpond.com
href="mailto:pentagon.systems@bigpond.com">Peter Pennisi</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, November 14, 2006 5:48
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [NSRCA-discussion] APC 18.1 x
10W props</DIV>
<DIV><FONT face=Arial size=2></FONT><BR></DIV>
<DIV class=Section1>
<P class=MsoPlainText><FONT face="Courier New" size=2><SPAN lang=EN-AU
style="FONT-SIZE: 10pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoPlainText><FONT face="Courier New" size=2><SPAN lang=EN-AU
style="FONT-SIZE: 10pt">I recently purchased some 18.1 x 10W APC props for
my DZ160. Apparently there appears to be another version 18.1 x
10.1.<o:p></o:p></SPAN></FONT></P>
<P class=MsoPlainText><FONT face="Courier New" size=2><SPAN lang=EN-AU
style="FONT-SIZE: 10pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoPlainText><FONT face="Courier New" size=2><SPAN lang=EN-AU
style="FONT-SIZE: 10pt">Could someone please tell me the difference between
both?<o:p></o:p></SPAN></FONT></P>
<P class=MsoPlainText><FONT face="Courier New" size=2><SPAN lang=EN-AU
style="FONT-SIZE: 10pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoPlainText><FONT face="Courier New" size=2><SPAN lang=EN-AU
style="FONT-SIZE: 10pt">I tried a quick ground run on this prop (stock) this
morning but could barely get 8000 RPM from the engine. I will take advice
from a member on this list and lop 1/4inch of each blade. What RPM readings
are people getting who are using either of these props on a YS DZ160
engine?<o:p></o:p></SPAN></FONT></P>
<P class=MsoPlainText><FONT face="Courier New" size=2><SPAN lang=EN-AU
style="FONT-SIZE: 10pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoPlainText><FONT face="Courier New" size=2><SPAN lang=EN-AU
style="FONT-SIZE: 10pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoPlainText><FONT face="Courier New" size=2><SPAN lang=EN-AU
style="FONT-SIZE: 10pt">Regards,<o:p></o:p></SPAN></FONT></P>
<P class=MsoPlainText><FONT face="Courier New" size=2><SPAN lang=EN-AU
style="FONT-SIZE: 10pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoPlainText><FONT face="Courier New" size=2><SPAN lang=EN-AU
style="FONT-SIZE: 10pt">Peter <o:p></o:p></SPAN></FONT></P></DIV>
<P>
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