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<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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