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)
The Bayfield 36 is a Canadian built, full keeled cruiser with traditional teak styling designed by Hayden Gozzard. Production started in 1985 and ran until the factory in Clinton, Ontario burned down in 1988. She is a unique combination of new and old thinking with her clipper bow, trailboards, and teak combings combined with an aluminium toerail and beamy interior. This is a “big” 36-footer, and owners love her as much for her good looks as for her amazingly spacious accommodations. Performance-wise she will not win you any races but when in a blow you will enjoy her heavy displacement, full keeled underbody. Handholds are wherever you need them.
The construction is solid glass with molded inserts to create the interior substructure while the deck is balsa cored. Chainplates tie into bulkheads or special stubs tied into the hull. The mast is keel stepped while the internal ballast is 6,500 pounds of lead. The fuel tankage is aluminium with 45 gallons capacity while the water and holding tanks are plastic. Her accommodations include two cabins, a head with tub, and spacious salon. Some versions have a fixed salon table while others have a table that folds down from the main bulkhead. Here is where the Bayfield shines with the spaciousness of a much larger yacht. In fact it is mystery how they packed the proverbial 10 pounds in 1 pound sack. Her engine was a Yanmar 4 JHE 44 HP which is still in many. Access is beneath the companionway and through the starboard cockpit bench.
The aluminium fuel tank is prone to corrosion. It sits just forward the companionway inserts deep into the bilge. The original stove used butane gas which is difficult to find and refill in the USA. Originally specifications listed 4′ 11″ as the draft. Actual drafts are around 5′ 9″ due to overbuilding and cruising weight. Exterior storage is limited with no lazzarettes or anchor locker.
» Bayfield 36 Review, Richard Jordan, Waves
» Contemporary Classic, Sven Donaldson, Boat Review
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