Theoretically yes but there is no noticeable difference. Its vital for cars as they have good grip on the road via the tires so without ackerman steering geometry the steering tires will be damaged and the vehicle will understeer . The water the rudders move through allows some relative slip between rudders so the cat can turn without damaging its rudders and the lose of speed through the extra drag is a small percentage of an already low number because it has most effect when you are tacking. It would have more effect on a wider cat, might be worthwhile on a Tornado and definitely on the large round the world cats.

Darryn
Mozzy
1782