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<DIV>The reason I bring this up is I flew my OS1.40 on a pipe in my ExcaliburII and then on a muffler for the last couple of years, in a Focus. Both setups were pretty similar in ground RPM. But the planes were dramatically different styles so I never got a good feel in the air if there was any difference between the pipe and the muffler. It transitions extremely well on the muffler and is very linear with more than enough power through Advanced (where I am currently). I'm finishing a Temptation this spring and planning on running the pipe set up again. I guess it will be easy enough to switch back and forth for some first hand knowledge.</DIV>
<BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">-------------- Original message -------------- <BR>From: "Dean Pappas" <d.pappas@kodeos.com> <BR><BR>> I am with Matt on this one! <BR>> Don't trust ground numbers too much. <BR>> You don't fly your plane sitting still on the ground, do you? <BR>> Dean P. <BR>> <BR>> -----Original Message----- <BR>> From: nsrca-discussion-bounces@lists.nsrca.org on behalf of <BR>> Rcmaster199@aol.com <BR>> Sent: Mon 3/6/2006 7:59 PM <BR>> To: nsrca-discussion@lists.nsrca.org <BR>> Cc: <BR>> Subject: Re: [NSRCA-discussion] 2C Pipe vs Muffler <BR>> <BR>> <BR>> <BR>> In a message dated 3/6/2006 6:57:30 PM Eastern Standard Time, <BR>> jeffghughes@comcast.net writes: <BR>> <BR>> was going through the data on Ed Hartley's 2 stroke page and <BR>> noted that there is virtually no difference between a piped OS1.40 and a muffled <BR>> OS1.40 for the prop sizes being used. I assume that is because to get a nice <BR>> linear throttle curve on a pipe, the pipe is deliberately set too long for peak <BR>> horsepower. My question is why run a tuned pipe at all if you are going to set <BR>> it too long for peak power?. Has anyone run back to back tests with same engine <BR>> and plane with a pipe vs a muffler to see if there is truly a difference in <BR>> power or feel? <BR>> <BR>> Yes and there is <BR>> <BR>> MattK <BR>> </BLOCKQUOTE></body></html>