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<DIV><FONT face=Arial size=2>Bob</FONT></DIV>
<DIV><FONT face=Arial size=2>There was a recent article in Kitplanes detailing
what Hartzell goes thru to get a prop certified for a given engine. They even
talk about failure modes you can't feel in the cockpit.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>It's no wonder were always hun'tin for our IC
engines. Electrics have far fewer
problems.
Nat</FONT></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=bob@toprudder.com href="mailto:bob@toprudder.com">Bob Richards</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 10:26
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] APC 18.1
x 10W props</DIV>
<DIV><BR></DIV>
<DIV>I'm curious about how one comes up with the best prop selection. In my
case, it has always been a very subjective thing to determine the in-flight
performance.</DIV>
<DIV> </DIV>
<DIV>Has anyone used any of the dataloggers to measure airspeed on
up/down/level lines? IMHO, that would be one way to remove some of the
subjectivity of in-flight performance. I think one of my christmas wish-list
items is the Eagle Tree system.</DIV>
<DIV> </DIV>
<DIV>Bob R.</DIV>
<DIV><BR><BR><B><I>mike mueller <mups1953@yahoo.com></I></B>
wrote:</DIV>
<BLOCKQUOTE class=replbq
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid"> From
my experience this is the best prop I have tried to date. I have mine on a
YS160/Genesis. I was using Biela 3 bladed props,APC 4 bladed props and
the 18x10.1 regular APC and this gives the best performance so far. Mike
Mueller <BR><BR><B><I>"Dr. Mike Harrison"
<drmikedds@sbcglobal.net></I></B> wrote:
<BLOCKQUOTE class=replbq
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<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>
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<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>
<DIV class=MsoPlainText><FONT face="Courier New" size=2><SPAN lang=EN-AU
style="FONT-SIZE: 10pt"><o:p> </o:p></SPAN></FONT></DIV>
<DIV 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></DIV>
<DIV class=MsoPlainText><FONT face="Courier New" size=2><SPAN lang=EN-AU
style="FONT-SIZE: 10pt"><o:p> </o:p></SPAN></FONT></DIV>
<DIV 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></DIV>
<DIV class=MsoPlainText><FONT face="Courier New" size=2><SPAN lang=EN-AU
style="FONT-SIZE: 10pt"><o:p> </o:p></SPAN></FONT></DIV>
<DIV 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></DIV>
<DIV class=MsoPlainText><FONT face="Courier New" size=2><SPAN lang=EN-AU
style="FONT-SIZE: 10pt"><o:p> </o:p></SPAN></FONT></DIV>
<DIV class=MsoPlainText><FONT face="Courier New" size=2><SPAN lang=EN-AU
style="FONT-SIZE: 10pt"><o:p> </o:p></SPAN></FONT></DIV>
<DIV class=MsoPlainText><FONT face="Courier New" size=2><SPAN lang=EN-AU
style="FONT-SIZE: 10pt">Regards,<o:p></o:p></SPAN></FONT></DIV>
<DIV class=MsoPlainText><FONT face="Courier New" size=2><SPAN lang=EN-AU
style="FONT-SIZE: 10pt"><o:p> </o:p></SPAN></FONT></DIV>
<DIV class=MsoPlainText><FONT face="Courier New" size=2><SPAN lang=EN-AU
style="FONT-SIZE: 10pt">Peter <o:p></o:p></SPAN></FONT></DIV></DIV>
<DIV>
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