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<DIV><FONT face=Arial size=2>Ihncheol</FONT></DIV>
<DIV><FONT face=Arial size=2>I have run the SX-H and the FX and could not
tell any difference power wise. The short crankshaft on the H was an
agravation at times so I did not buy another one.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I ran the engine with 30% nitro and two head shims.
The ES pipe, can't remember the number ( 26" OAL and 1 9/16 OD ) gave max power.
I had a power loss with the 140 ES pipe. P</FONT><FONT face=Arial size=2>ipe
setting was 25" plug to baffle. RPM about 7800 with a 14.5-11 4 blade. You
can also run a 15-12 APC.</FONT></DIV>
<DIV><FONT face=Arial size=2>Thrust was awesom with no tuning problems and
very quiet.
Nat</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=pnahobbies@sbcglobal.net
href="mailto:pnahobbies@sbcglobal.net">Ihncheol Park</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> Monday, June 19, 2006 5:47 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [NSRCA-discussion] need help on
Tuned pipe setup w/Perry pump</DIV>
<DIV><BR></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">I am finally trying
to setup my 91SX-H w/ tuned pipe together with Perry’s VP30
pump.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Current setup is
Karl’s header with a 140 size pipe. Distance from plug to first baffle
is 22”. APC 15x8.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">The engine idles fine
without much variation on RPM, but going to peak rpm take for a while.
At WOT rpm keeps on increasing slowly from 9400 rpm. But dies out
eventually and quit. I am still confused if the engine is rich or lean
since the pump is involved. High speed needle is about 2 turns out. Idle
is at 1 O’clock position. <o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">I went out two days
and both days the engine died at wrong places, landed on two feet tall wheat
field resulting in belly pan damages. No landing gear damage since I
still have retracts on this plane.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Can anyone help me on
this? I don’t want to spend $300 + for a YS 110 since this setup has way
more power than previously used YS91AC. Airframe lost 4.5 oz so
far with this setup. <o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Going back to
workbench for Oxalys 50 to fly this weekend.<o:p></o:p></SPAN></FONT></P>
<DIV>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Thanks,<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Ihncheol
Park</SPAN></FONT>cheol Park<BR><BR><FONT face=Arial color=black><SPAN
style="COLOR: black; FONT-FAMILY: Arial"><o:p></o:p></SPAN></FONT></P></DIV></DIV>
<P>
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<P></P>_______________________________________________<BR>NSRCA-discussion
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