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I think the issue may be the motor being underpropped for the type of performance you are getting from the pipe. You said you were getting 6950 on a 26x10 Mej. Imagine what was happening in the air. There would be big loads on the engine at that RPM.
I suggest getting a 28x10mej. I haven't heard of this occuring on a larger prop with the pipe. |
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Forget about the engine load, but replace engine load with noise load.
A well tuned 80cc engine on pipes will turn in the 5800 - 6500 rpm range, and the prop should suit the power the engine will deliver at those rpm. Larger diameter/larger pitch props perform much better in ALL respects, and do not produce deafening noise (>80dbA) at the pilot's position. It takes some getting used to, but once accomplisleshed it proves that small props just produce the FEELING of plenty gusto, without producing the PERFORMANCE.