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Jeff I ran a muffler in 2004 on my OS when I was starting back and just
wanted a simple setup. I ran the Bolly MF590 and it was a very nice
and simple setup. Last year I went to a pipe -Bolly EQ140R and copied
the setup length etc. that Dave Lockhart used to run when he ran the
OS. I don't have numbers to compare but the difference is in the air
when the motor unloads. The pipe would run the APC 15 3/4 -11 or 10
(Lockhart) 3 blade no problem but the muffler didn't have the muscle to
pull it in the summer heat. I would bet though they probably tached
about the same on the ground. People are running the pipe a little
longer than max perf to keep the needle setting from getting too
critical. Ideally you would change pipe setting for temp - humidity
etc but who wants to do that? We just run a little extra length to
have an "all weather" setup. You still will have lots of power, just
not "peak".<br>
<br>
Chris<br>
<br>
<a class="moz-txt-link-abbreviated" href="mailto:jeffghughes@comcast.net">jeffghughes@comcast.net</a> wrote:
<blockquote
cite="mid030620062356.13909.440CCC34000D20160000365522007348409C0A08099A080900000A06@comcast.net"
type="cite">
<div>I was going through the data on Ed Hartley's 2 stroke page and
noted that there is virtually no difference between a piped OS1.40 and
a muffled OS1.40 for the prop sizes being used. I assume that is
because to get a nice linear throttle curve on a pipe, the pipe is
deliberately set too long for peak horsepower. My question is why run a
tuned pipe at all if you are going to set it too long for peak power?.
Has anyone run back to back tests with same engine and plane with a
pipe vs a muffler to see if there is truly a difference in power or
feel?</div>
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<div class="headerdisplayname" style="display: inline;">Subject:
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Re: [NSRCA-discussion] Fuel Regulation in 2C Engines</td>
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<div class="headerdisplayname" style="display: inline;">From: </div>
"Tim" <a class="moz-txt-link-rfc2396E" href="mailto:twortkoetter@yahoo.com"><twortkoetter@yahoo.com></a></td>
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<div class="headerdisplayname" style="display: inline;">Date: </div>
Mon, 6 Mar 2006 22:24:58 +0000</td>
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<div class="headerdisplayname" style="display: inline;">To: </div>
"'NSRCA Mailing List'" <a class="moz-txt-link-rfc2396E" href="mailto:nsrca-discussion@lists.nsrca.org"><nsrca-discussion@lists.nsrca.org></a></td>
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