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... and today rudders are back to "rounded" elliptical shapes, I believe to minimize vortice losses off the square tip. (harking back to the Spitfire fighter's wing design) btw- strictly armchair talking here....
Rounding off the tip of your rudder will cost you effective area. It may avoid some of the cavitation you feel at extreme conditions, but the loss of maneuverability in more typical conditions may not be worth it.
You do need a real designer's take on this.
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".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
1984 Fast/Nicholson 345
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