Propeller protector

A protector for a propeller mounted at a lower end of a drive shaft housing that has two laterally directed cavitation fins disposed on the housing above the propeller, said propeller protector being operable to obstruct or prevent access to said propeller and comprising shield means including a generally imperforate end wall region for facing the aft side of a propeller in use to block or obstruct the efflux therefrom, further wall means merging with said imperforate end wall region generally circumferentially to surround a said propeller, and engagement means for engaging in use a said drive shaft housing on or adjacent said cavitation fins, thereby releasably to secure the shield means with respect to a said propeller, wherein said engagement means comprises a longitudinal guide means whereby in use the protector may be slid forwardly to at least partially surround a said propeller, said engagement means being secured to said shield means by a connection arrangement which allows adjustment of the spacing of the longitudinal guide means relative to the shield means in at least one direction.