Zippydogg wrote:

One way to control damage from a seized unit is to use a frangable member in the power system.  I know of one outboard motor manufacturer who uses a "shear" pin of soft brass between the propeller and the drive shaft.  When the prop "seizes" (by being stopped when hitting a log, rock, etc,) it shears the easily replaceable pin rather than trashing the drive system.

 
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