Join Date: Feb 2000
Location: Annapolis, Md
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Fat Ass Sterns of New Boats
I just caught your response to my original response to your original post that started this thread. In your original post you started off saying, "What the hell are those designers thinking of when they make the stern of the boat so wide?" I tried to answer that question by explaining the hydrodynamic reasons for that. This aftward shift in center of buoyancy (which has resulted in the more powerful stern sections that you mentioned) has filtered down off of the racecourse and its associated tank testing. When you have highly respected race boat designers like Bruce Farr and Groupe Finot, designing the Beneteaus, and Glen Henderson designing recent hulls for Hunter, and Tim Jackett designing C&C''s, of course the hull forms will derive from race boats and will push the envelope a bit toward better speed and handling characteristics. (I don''t know why Catalina has gone to wider stern sections.)
While the shape of the hull will alter the accomodations plan, making the vee berth narrower or moving it aft a bit and perhaps make a rommier aft cabin, looking at the boats and designers that I mention above, I firmly believe that the change derives from performance and not ergonomics and that the ergonomics have been adjusted to accomodate the sailing characteristics and not the other way around.
That said, none of these boats appear to be derived from sleds. They appear to be more closely derived from the IMS typeform. I donít know if you''re familiar with the difference between racing sleds and IMS type forms so Iíll assume that your comments were from an uninformed perspective. In either case I never did make a leap from ergonomics on a cruising boat to the professional racing boats. I simply attempted to answer your original question about what designers were possibly thinking when they designed more powerful stern sections.
You went on to ask,"When heeled over does the fat ass stern have any adverse affect on the stability of the boat?"
Again, I tried to answer your question by explaining that more powerful sections, when properly modeled do not have a negative effect on stability and properly done can help with stability while not hurting motion comfort adversely.
You end with "I am more convinced than ever that the people that design and build these boats have never sailed one of their creations."
You may be convinced of that but when you look at the sailing credentials of the current crop of designers named above, these are all serious offshore sailors albeit mostly on racing yachts. Bruce Farr, who I know best in this esteemed grouping, personally owned for many years a Farr 1020 (a New Zealand built boat with very powerful stern sections for a 34 footer) that he sailed and cruised out of Annapolis. He certainly has spent time on his boats. Henderson, and Jacketts are no strangers to sailing their boats as well.
I am not sure what your point you are trying to make by mentioning wing keels, but wing keels were introduced in 12 meters to improve windward performance in a boat that from a pure speed stand point wanted to be deeper. They worked well on the 12''s and were introduced in cruising yachts as a way to improve the performance of a shoal draft keel. They actually accomplished that goal pretty well. Obviously, all other things being equal, they do not sail as well as a deeper fin keel or fin and bulb.