There is general agreement that the original rudder on the W42 is undersized. Many owners have enlarged it. Ted Brewer feels that it can be safely enlarged by up to 30% without risk to the original rudder shaft. This is certainly true if the shaft has been built to the designers original specifications. I plan to enlarge the rudder but first I will split the rudder and check and overhaul the shaft as necessary. This, hopefully, is a one off operation which would not have to be done again for the remaining life of the boat.
Bottom photo courtesy of www.WhitbyBrewerSailboats.com