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Actually, that 2,300 rpm was about the maximum I remember. It was cruise for that plane. I don't remember if there was vibration above that, there probably was, and below that it got better.
I wasn't meaning to imply that there would be certain rpm bands to watch out for, just that at typical rpm that you'd have on the Continental, there would be an effect.
Interestingly, the change in airflow was distinctly noticeable from the ground. That particular Kolb had intake and exhaust silencers and the dominant noise was the prop beat.
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