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The recommended

The recommended hang over distance between the cutlass bearing and the front edge of the prop hub is 1X the shaft diameter max. Beyond that and you can start to create shaft whip. 4" inches is way too much but 5" is really bad..

Per ABYC Standard P-06


6.5.5.4 The distance between the forward end of the
propeller hub and the aft end of the last strut bearing shall
be limited to one shaft diameter
.
 
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