Join Date: Feb 2000
Location: Annapolis, Md
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I would suggest that almost all of those number have zero or no bearing on the reality at hand. Newport, and most trailer-sailer builders of that era routinely published displacements that were way low of the actual weight of the boats. These published weights were typically based on pretty hypothetical dry design weights, which made no consideration of actual sailing weights, let alone crew weight. Published sail areas were typically with the stock overlappinbg headsails, and were not with 100% foretriangle as is supposed to be used for SA/D and so your SA/D is probably substantially lower than you think as well. Motion comfort is probably about right for a boat with relatively hard chines and a flat bottom, a high vertical center of gravity and so on. Then there is Capsize Screen Formula, which is mostly a useless formula since it does not include the major factors that control capsize (vertical center of gravity and buoyancy, dampening etc.). That said with the Newports high vertical center of gravity and low ballast ratio they should be in the near disaster zone of 3 or 4.
Having sailed trailerables out in the Atlantic Ocean shoals, it comes down to this, in good weather you should be fine, but when things turn, and they can quickly, you can get very steep, very tall waves, and a boat like this is easily rolled.
I once did an offshore race out of Savannah on a 25 IOR quarter tonner that I owned where we needed to round a mark roughly 5 miles offshore. The weather was predicted to be nice and the race began just that way. As we rounded the mark teh weather turned really nasty, and within 15-20 minutes we were in 10-12 foot seas that were occasionally breaking and threatening to roll us. This was a boat with a 40% ballast ratio and 5' 6" draft. The Newport is a boat with a 23% ballast ratio when dry, and far less loaded.