As i understand it, the tip to hull clearance will effect vibrations but not prop-walk. The pitch is the leading effect on prop-walk. A larger diameter prop will require less pitch to produce the same thrust and subsequently less walk. Likewise a smaller prop will require more pitch for the same thrust and subsequently more prop-walk.
Why do you think the boat was over propped? The only indicator I would use to identify over-propped is weather or not the engine could reach full rated RPM (if it was a diesel I'd say without blowing black smoke). You can work around prop-walk by punching the throttle to get reverse motion and then putting it in neutral. Steer where you need to go and if needed punch it again as necessary to get more reverse motion. Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On May 14, 2015 4:10 PM, "Martin Kane via CnC-List" <[email protected]> wrote: > Boat was significantly over-propped when I acquired her. Largely because > transmission ratio is 2.2:1 not 2.62:1 as stamped on the casing. While the > props that came with the boat (a Gori 15X10 and a 3 blade fixed 14X9) were > too big, prop walk was not an issue. > Just installed a Campbell Sailor 12x6 and the prop walk is severe (in > spite > of the additional tip to hull clearance). It is basically impossible to > turn > the bow to port in reverse . The bow swings to starboard and then once > there > is some movement through the water will crab sideways, but the bow will not > swing around to port. I have not found any combination of throttle and > rudder position that makes the situation any better. > > I need to replace the prop to avoid getting into trouble in close quarters > at some point. Question to C&C 29-2 owners: Has anyone found a prop that > works well going forward and in reverse. > > Thanks in advance. > > Martin > Recalculating C&C 29-2 > Mimico Cruising Club > > > > > _______________________________________________ > > Email address: > [email protected] > To change your list preferences, including unsubscribing -- go to the > bottom of page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > >
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