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Hi, Rick.
I have been flying aroung a lot lately at 100 to 120K working on my Instrument rating (120 to 140 mph on my '67 337B).
A while back, I noticed a slight bumping (shudder?), but neither of my cfi's could really feel it. I dropped a notch of flaps, and the bumping went away.
I have discussed this with my mechanic and he suggested that it may wll be just a slower airspeed/mp/rpm setting than I am used to... but I am not so sure.
I am more aware than before, but do not experience it above about 140 mph.
This probably doesn't help, but my hackles just went up a notch.
Jim
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