Handclutch
Well Known Member
I have been noticing this occasionally but it's becoming more pronounced. Above 5150 rpm I'm getting, for want of a better description, a rhythmic, thrumming noise. And 'noise' is a bit of an overstatement - just audible with a good noise cancelling headset, wouldn't be heard with a passive headset.
Absolutely nothing at less than 5150, and I can't feel feel it through the air frame. The prop has been dynamically balanced, although some time ago, and is quite smooth.
I suspect it is some sort of resonance. Wondering if anybody has had a similar experience?
By way of trying to provide a better description it is somewhat similar to the noise from a worn rear axle bearing on a car. In my (limited) experience a worn bearing produces that rhythmic sound at pretty much any speed, but this is limited to a narrow rpm range.
I appreciate that many people cruise at less than 5150, and probably wouldn't notice it, but I'm usually a little above that.
Jack
Absolutely nothing at less than 5150, and I can't feel feel it through the air frame. The prop has been dynamically balanced, although some time ago, and is quite smooth.
I suspect it is some sort of resonance. Wondering if anybody has had a similar experience?
By way of trying to provide a better description it is somewhat similar to the noise from a worn rear axle bearing on a car. In my (limited) experience a worn bearing produces that rhythmic sound at pretty much any speed, but this is limited to a narrow rpm range.
I appreciate that many people cruise at less than 5150, and probably wouldn't notice it, but I'm usually a little above that.
Jack