<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;"><DIV>I ran that muffler for quite a while and have to admit that I like better than a pipe. I did run the full length Mac header and at that length with a 15X11 4B prop was able to get a very smooth and constant speed with great breaking but sacrificed top end power a bit. You can almost run the needle valve anywhere with that set-up as it extremely forgiving.</DIV>
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<DIV>It is a muffler so theoretically reducing the header length shouldnt make much difference...but mine did run very well at full length.</DIV>
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<DIV>Colin.<BR><BR>--- On <B>Fri, 2/6/09, Jay Marshall <I><lightfoot@sc.rr.com></I></B> wrote:<BR></DIV>
<BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(16,16,255) 2px solid">From: Jay Marshall <lightfoot@sc.rr.com><BR>Subject: [NSRCA-discussion] OS140 Header/Pipe<BR>To: nsrca-discussion@lists.nsrca.org<BR>Received: Friday, February 6, 2009, 8:29 AM<BR><BR>
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<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">I am installing a OS140RX engine and OS Header, and a Bolly MF 480 R pipe into a new (Impact) airframe. From the “Bolly Book” this appears to be more of a muffler than a tuned pipe. This model is not in the “book”.</SPAN></FONT></DIV>
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<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Is anyone running this configuration?</SPAN></FONT></DIV>
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<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Space is a little tight and I was thinking of cutting off some of the header but have no idea of the implications of this move. Evidently Bolly no longer produces CF pipes and I can find no specific information on this setup.</SPAN></FONT></DIV>
<DIV><B><I><FONT face="Brush Script MT" size=4><SPAN style="FONT-WEIGHT: bold; FONT-SIZE: 13.5pt; FONT-STYLE: italic; FONT-FAMILY: 'Brush Script MT'">Jay </SPAN></FONT></I></B><B><I><FONT face="Brush Script MT" size=4><SPAN style="FONT-WEIGHT: bold; FONT-SIZE: 13.5pt; FONT-STYLE: italic; FONT-FAMILY: 'Brush Script MT'">Marshall</SPAN></FONT></I></B> </DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt"> </SPAN></FONT></DIV></DIV></DIV><PRE>_______________________________________________
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