I thought I'd throw this one out to the group . I have a mcauley 71x48 or is it 72x 48 which ever its the right diameter I had it overhauled and dynamically balanced just before Oshkosh I brought it back to the shop because I felt a vibration when I'd reduce power for landing and between the power range of 1800 -2100 its anoying but whomever I talk to about it suggest that some power ranges have inherent vibrations or harmonic this or that whats the word on this I do remember that my old Cessna 140 had a placard about 1975-2100 is this the same thing?
toss that in the ring thanx dennis 99564 415c/d
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