Jim Weir wrote in message . ..

From a mechanical engineering point of view on a horizontally opposed engine,
there are (as with most things) three axes of freedom -- fore and aft, side to
side, and up and down (longitudinal, lateral, vertical).

Can these things measure rotational vibration, or just linear? Seems
to me that the real shaking going on up front is rotational. Being
able to measure the vibration in the other 3 axis would be nice. I
vote for a combination of switchable/discrete channels and a summation
mode.
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Leon McAtee