<div>I know that this is a little off topic, but all this talk of swinging oars has got me a little nostalgic. I used to fly a PA-2 with a YS60FR 2-stroke and an APC 11x11 prop. It was very quiet with what I thought was great performance. </div> <div> </div> <div>I never in my wildest dreams would have imagined that we would be swinging props that were almost twice the diameter with nearly the same pitch. Progress is awesome!!!!</div> <div> </div> <div>Now back to your regularly scheduled programming.</div> <div> </div> <div>Anthony<BR><BR><B><I>Mike Hester <kerlock@comcast.net></I></B> wrote:</div> <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid"> <META content="MSHTML 6.00.2900.2963" name=GENERATOR> <DIV><FONT face=Arial size=2>That's true, it's just a feel thing. I agree with Mike's assessment.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial
size=2>I'm using the 18.1x10 regular and Jim Ivey is using the 18.1x10w clipped. They both work really well. Mine tachs right around 8100, Jim's is really close to that number as well.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>The differences in the 2 as I can see, just an impression: The 18.1x10 that I'm using has a really wide speed envelope. Good slow down lines but it will turn into a rocket at full power. It does load the engine down a bit, but I'm running it a little rich.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>The 18.1x10W clipped that Jim is using has really good down lines, good top end, but at cruise speed it's turning more RPMs. As a result, he doesn't have to move the stick too much transitioning from level to an upline. it has pretty good flat torque.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>I'd say it
this way: If your style is slower, try the clipped 10W. if you like to move along a little faster during normal flight, use the regular 10. </FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>That's just my impressions right now. Note that I haven't tested these props on really hot, humid days, so I can't say for certain if it's too much load or not. Yet.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>-Mike</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>PS it's also important to note that these props are too big for a normal TT 3" 120 cut spinner. Close, but you have to open up the cut outs slightly. At least I had to....</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=mups1953@yahoo.com href="mailto:mups1953@yahoo.com">mike mueller</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 1:04 PM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] APC 18.1 x 10W props</DIV> <DIV><BR></DIV> In my case its just a touchy feely thing. I tend to base most things on it. Mike<BR><BR><B><I>Bob Richards <<A href="mailto:bob@toprudder.com">bob@toprudder.com</A>></I></B> wrote: <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid"> <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 style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid"> <META content="MSHTML 6.00.2900.2180"
name=GENERATOR> <STYLE>@font-face { font-family: Palatino Linotype; } @font-face { font-family: Comic Sans MS; } @page Section1 {size: 612.0pt 792.0pt; margin: 36.0pt 77.95pt 36.0pt 77.95pt; } st1\:* { BEHAVIOR: url(#default#ieooui) } P.MsoNormal { FONT-SIZE: 12pt; MARGIN: 0cm 0cm 0pt; FONT-FAMILY: "Palatino Linotype" } LI.MsoNormal { FONT-SIZE: 12pt; MARGIN: 0cm 0cm 0pt; FONT-FAMILY: "Palatino Linotype" } DIV.MsoNormal { FONT-SIZE: 12pt; MARGIN: 0cm 0cm 0pt; FONT-FAMILY: "Palatino Linotype" } A:link { COLOR: blue; TEXT-DECORATION: underline } SPAN.MsoHyperlink { COLOR: blue; TEXT-DECORATION: underline } A:visited { COLOR: purple; TEXT-DECORATION: underline } SPAN.MsoHyperlinkFollowed { COLOR: purple; TEXT-DECORATION: underline } P.MsoPlainText { FONT-SIZE: 10pt; MARGIN: 0cm 0cm 0pt; FONT-FAMILY: "Courier New" } LI.MsoPlainText { FONT-SIZE: 10pt; MARGIN: 0cm 0cm 0pt; FONT-FAMILY: "Courier New" } DIV.MsoPlainText {
FONT-SIZE: 10pt; MARGIN: 0cm 0cm 0pt; FONT-FAMILY: "Courier New" } P { FONT-SIZE: 12pt; MARGIN-LEFT: 0cm; MARGIN-RIGHT: 0cm; FONT-FAMILY: "Times New Roman"; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto } SPAN.EmailStyle17 { FONT-WEIGHT: normal; COLOR: blue; FONT-STYLE: normal; FONT-FAMILY: "Comic Sans MS"; TEXT-DECORATION: none; mso-style-type: personal } SPAN.EmailStyle18 { COLOR: navy; FONT-FAMILY: Arial; mso-style-type: personal } SPAN.EmailStyle20 { COLOR: navy; FONT-FAMILY: Arial; mso-style-type: personal } DIV.Section1 { page: Section1 } </STYLE> <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> <DIV class=MsoPlainText><FONT face="Courier New" size=2><SPAN lang=EN-AU style="FONT-SIZE: 10pt"><?xml:namespace prefix = o ns =
"urn:schemas-microsoft-com:office:office" /><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> <HR>
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