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<DIV><FONT face=Arial size=2>With an engine like the YS, the valve action
precludes a lot of real tuning as in the principles of a 2-C pipe and all
of that sexy resonant wave bouncing etc. - (You guys in the hotel room - no
reaching for the Kleenex...........)</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>With the YS's the back pressure is much more of and
issue. The diameter of the header needs to at least be equal to the exhaust port
diameter. I also proved to myself that you can get more rpm if the header
diameter does not expand too soon or too much.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>A large volume ES pipe would give a 200 rpm
increase over the Hatori's of the day. I got the best results and sound
reduction from the long skinny ES 2-c pipe that was designed for narrow pipe
tunnels. It was not easy to use on the OS 1.40 but proved not to be a waste of
money when it was used on a YS. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>The 1/2" Teflon connector could be anywhere from
4-9" long and did not change the "tune" or rpm.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I did use heat sinks to protect the CF from melting
with the high 4-c gas heat at the neck of the pipe. I made finned ali-reducers
to connect the pipe to the 1/2" Teflon. This set-up worked so
well that one year Quique thought I was running the early
DZ's.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>I just could not find a system the made my planes
look the way he flew them :-)</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>Regards,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Eric.</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=DaveL322@comcast.net
href="mailto:DaveL322@comcast.net">DaveL322@comcast.net</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, February 13, 2006 3:21
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] Pipe for
OS 140RX</DIV>
<DIV><BR></DIV>
<DIV>I only messed with the 4Cs when the pattern rules essentially forced the
use of a 4C to be competitive - so 90% of my 4C tuning was with the SF and
AC. Nonetheless, I did find changing header diameters and lengths could
improve things slightly - attributable to more efficient scavenging during the
exhaust cycle. As basic theory would suggest, relatively narrower and
longer header/pipe inlets seemed to help midrange torque, while relatively
larger diameter stuff helped top end power. No where near the gains in
performance possible with a 2C tho. I seem to recall Pappas publishing
some actual numbers years ago in FM.</DIV>
<DIV><BR>Dave</DIV>
<DIV> </DIV>
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Original message -------------- <BR>From: "Bill Glaze"
<billglaze@triad.rr.com> <BR>
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<DIV><FONT face=Arial>Dave:</FONT></DIV>
<DIV><FONT face=Arial>How effective is pipe length experimentation with the
Y.S. engines? With the large V-8 engines I used to race, header
length, while not critical, was still effective for squeezing out the last
horsepower. (Yeah, we got it down to that kind of increment on the
dyno.)</FONT></DIV>
<DIV><FONT face=Arial>Bill Glaze</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=DaveL322@comcast.net
href="mailto:DaveL322@comcast.net">DaveL322@comcast.net</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, February 13, 2006 11:05
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] Pipe
for OS 140RX</DIV>
<DIV><BR></DIV>
<DIV>It is nice that we have several very good options available for
exhaust systems.</DIV>
<DIV> </DIV>
<DIV>With regard to tuned pipes, to truly evaluate the capability of the
pipe, they do need to be tuned. And how they are tuned is often
different for different users depending on priorities for power, torque,
sensitivity, etc - to say nothing of matching the tune length
to airframe drag and weight, prop, flight style, etc. Simply
plugging the pipe onto the end of a header is rarely going to yield the
best performance for that pipe. Similarly, making comparisons
between different pipes that have not been tuned is not much more than a
chance comparison. Granted, some pipes have a broader sweet spot,
but they all benefit from proper tuning.</DIV>
<DIV> </DIV>
<DIV>Regards,</DIV>
<DIV><BR>Dave</DIV>
<DIV> </DIV>
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Original message -------------- <BR>From: "David Flynt"
<dflynt@verizon.net> <BR>
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<DIV>
<DIV><SPAN class=970012414-13022006>> </SPAN>Or should we spark up a
rivalry like OS vs YS, JR vs Futaba, Composite vs wood, etc? That could
be entertaining =)</DIV>
<DIV> </DIV>
<DIV><SPAN class=970012414-13022006>Mike, I like the ES also. Now
what was that composite vs wood rivalry all about?</SPAN></DIV>
<DIV><SPAN class=970012414-13022006></SPAN> </DIV>
<DIV><SPAN class=970012414-13022006>David</SPAN></DIV></DIV>
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<DIV class=OutlookMessageHeader dir=ltr align=left><FONT
face=Tahoma>-----Original Message-----<BR><B>From:</B>
nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org]<B>On Behalf Of
</B>Mike Hester<BR><B>Sent:</B> Sunday, February 12, 2006 10:03
PM<BR><B>To:</B> NSRCA Mailing List<BR><B>Subject:</B> Re:
[NSRCA-discussion] Pipe for OS 140RX<BR><BR></FONT></DIV>
<DIV>I think when it comes between the aeroslave and the ES pipe, it's
personal preference. With some notable but subtle differences.</DIV>
<DIV> </DIV>
<DIV>Here's what I noticed:</DIV>
<DIV> </DIV>
<DIV>The ES 2C140M80 pipe I use is 3.2 ozs, the Aeroslave is right at
3 ozs. it's pretty much a wash.</DIV>
<DIV> </DIV>
<DIV>The transition is bit little smoother on the ES. </DIV>
<DIV> </DIV>
<DIV>The Aeroslave pipe gives about 100 rpm more on the top end.
</DIV>
<DIV> </DIV>
<DIV>(both above using standard length header, no cutting and tuning).
</DIV>
<DIV> </DIV>
<DIV>The Aeroslave costs less, but has been difficult to get in the
past. I believe that may no longer be an issue. </DIV>
<DIV> </DIV>
<DIV>The ES is much more easy on the eyes.</DIV>
<DIV> </DIV>
<DIV>The Aeroslave is physically smaller, and could fit better in
tight installations. I've found this to be true on a few
applications.</DIV>
<DIV> </DIV>
<DIV>The ES (for me) has proven very very durable. I've never worn one
out, ever. I have one with almost 2000 flights on it. It was involved
in a crash before I got it, The airplane was completely destroyed,
head in full speed...the pipe wasn't scratched. It only had about 50
flights before the crash.</DIV>
<DIV> </DIV>
<DIV>Also Ed Skorepa has been very good to me service and price-wise,
so I suppose there's some loyalty involved. Lance has also been great
to me, and so I also am running an Aeroslave in my older Black Magic
prototype now. </DIV>
<DIV> </DIV>
<DIV>So, I run both. The ES is more "bling" and a little smoother, the
Aeroslave is more business-like and stronger on the top end but
stumbles just a tad in the mid range. </DIV>
<DIV> </DIV>
<DIV>I'd run either in a heartbeat. I just slightly prefer the ES for
my newer stuff. You can't go wrong with either.</DIV>
<DIV> </DIV>
<DIV>Or should we spark up a rivalry like OS vs YS, JR vs Futaba,
Composite vs wood, etc? That could be entertaining =)</DIV>
<DIV> </DIV>
<DIV>-Mike</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=DaveL322@comcast.net
href="mailto:DaveL322@comcast.net">David Lockhart</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> Sunday, February 12, 2006
11:27 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion]
Pipe for OS 140RX</DIV>
<DIV><BR></DIV>
<DIV>I've run most of the pipes available in the past couple years
on both the OS (RX and EFI) and Webra (145 and 160). The
"best" pipe depends on how you prioritize power, throttle response,
noise, weight, and price. If I needed to buy a pipe today, I'd
go with the Aeroslave as I believe it is best or very close to best
in all the categories I listed.</DIV>
<DIV><BR>Regards,</DIV>
<DIV><BR>Dave</DIV>
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