The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.
Classic hull speed formula:
Hull Speed = 1.34 x √LWLA more accurate formula devised by Dave Gerr in The Propeller Handbook replaces the Speed/Length ratio constant of 1.34 with a calculation based on the Displacement/Length ratio.
Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio.311
Hull Speed = Max Speed/Length ratio x √LWL
A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.
SA/D = SA ÷ (D ÷ 64)2/3
A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.
Ballast / Displacement * 100
A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.
D/L = (D ÷ 2240) ÷ (0.01 x LWL)³
This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.
Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam1.33)
This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.
CSV = Beam ÷ ³√(D / 64)
From the original designer:
Yes I am the designer of the Monterey 24 sailboat. I consulted with Peter Barrett (sp?) of North Sails Pewaukee, WI on the rigging and he did the final sail design. I did all the rest of the design and actually lofted it on plywood in the loft of a barn in Wisconsin. In the days before lofting software.
The Monterey 24 was designed in the early 1970’s as a trailerable sailboat but when the fuel crunch of the mid ’70s hit the public turned to smaller cars and the trailerable sailboat market took a dive.
Northern Yachts of Elkhorn, WI produced 30 of these boats and sold them through a dealership network. Just as the company had completed its new manufacturing and office facility orders for boats with deposits began to be canceled. This ultimately led to the closing of business before they had even occupied the new building.
Unfortunately for me it came at a time when I was working on the design of a new line of sailboats for them which included a 40’ mid-cockpit sloop (similar to a Morgan 41). But that sailboat only came to life on paper.
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