<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
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