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post #109 of Old 03-20-2012
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Re: Full or fin keel?

Originally Posted by PCP View Post
Marchaj made a notable theorist work trying to explain reality (based on 35 year old sailing boats) trough equations and mathematical calculations but let me tell you that even if static stability is a simple and forward thing, dynamic stability is a very complicated subject (the interaction of a variable sea motion with a boat and its effects on boat stability) and even today with all tank testing and mathematical computer aided models it is far from being a settled matter.
Dynamic stability to illustrate the difference between hull and keel designs is fairly trivial and can easily be simulated on any PC. Keep in mind that yacht designers from 100 years ago understood the concepts quite well. And all their calculations were with pencil and paper.

But if the science is still messing around with dynamic stability Naval Architects have been working on the model of the best boat to fast and safely cross oceans. Probably nothing as contributed as much to the knowledge of dynamic stability than the 35 years of designing small boats to solo crossing oceans, what is called the Mini class racing:
Lol... The million dollar question is "best boat". This is kind of a silly statement. What is best boat? If you talk to one person, it it speed at the the expense of everything. As with a racer. Such a boat is great for a boat full of excited sailors whose only goal is to get from point a to b in the shortest time.

However, the average cruising couple does not is not so motivated to put up with being thrown around like a rag doll in a washing machine. So the typical cruiser needs a more rough water friendly boat. The typical IP couple will heave to and go down and sip coffee and read books while the storm rages outside.

That is the difference between a true rough water boat and the typical lightweight cruiser.

Last edited by BryceGTX; 03-20-2012 at 10:52 PM.
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