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Bayfield 29 diesel auxiliary offshore cutter rig. Conventional Fiberglass construction hand laid-up alternate layers of fiberglass mat and woven roving hull and deck headliner. Sliding companionway, spray hood and cockpit hatches cored with plywood.
Equipment: Yanmar 2GM 13 Hp 2-cylinder salt water cooled engine; 1” stainless steel shaft & 3-bladed fixed bronze propeller; Pedestal steering gear w/chain & cables guided by sheaves; 17 gallon fuel tank; 30 gallon fresh water tank; 20 gallon waste tank; 12v Par Max fresh water pressure pump; Icebox with 12v/120v compressor evaporator; Danforth 13-S type anchor with chain and rode; Stainless steel 10kg Bruce type anchor; Standard Horizon VHF with RAM; Signet depth-sounder; Signet knot-meter; Galaxy pedestal compass; Harken roller furling on genoa; Harken roller furling on jib; True Charge 20 amp battery charger; 6 gallon water heater.
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 √LWL
A 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)
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