[alberg30] Re: Motor mounts

[Gordon E. White]

From: "Gordon E. White" <gewhite at crosslink.net>

   Remember that even with a universal joint (a Constant Velocity joint
is just a special kind of U-joint that allows more angular displacement
than the older versions like the Ford cross and trunion, the rubber
donut, the Rzeppa joint, etc.) you lose power when you have any bend in
a drive line. Also, with a u-joint where there is any deflection you
need a way to handle the inherent if  minute variations in length. With
a solid joint there needs to be a spline on the shaft at one end. The
rubber versions inherently allow some length flexibility. There is
probably no need for a full constant velocity joint per se in a boat
except with maybe an outdrive that can be adjusted through a
considerable arc, but any displacement from true is going to use up
power.
    It is probably comforting to have a joint that eliminates the
problem of the shaft whipping in the cutlass bearing because a little
misalignment at the engine becomes a lot at the bearing, but even so,
engine alignment should be pretty accurate.

                                - Gordon White A-275


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