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Cherokee 180 vibration in critical RPM range

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grantr

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Good day all
This is an extension of a previous thread which has helped significantly. This time I would like to know if one can feel the vibration within avoid constant operation range of 2150-2350. During my previous two flights after 20 minutes at 2400 RPM a fairly significant vibration occurred. In both these cases I throttled back, increased mixture and vibration dissapeared. This forum then highlighted that it may be aerodynamics so I went out today and found without doubt that it is the motor giving the vibration at 2350-2400 RPM. This time I increased RPM to 2500 and the vibration dissapeared. Has anyone else experienced this please? Your comments are always much appreciated
 
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