Universal joints are NOT constant velocity joints. Sure, if you
apply 10 turns at one side, you'll get 10 turns at the other. If you
apply a constant 10 rpm at one side, the *average* at the other
will be 10, but it will vary. I can't remember the actual math from
the physics regarding the different angular rotations involved, but
I do believe that the U joints do need to be aligned, not 20 degrees
off.
mjb.
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