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With a PHRF 84 rating, the design concept of the J/36 is similar to J/Boat’s other successful models (like the J/35) with low freeboard, wide decks for effective hiking and interior volume, a high aspect fractional rig, low wetted surface, and long effective sailing length. With a compact galley and enclosed head, the large main saloon with teak interior provides significant volume from an 11.76’ beam and 6’1” headroom. Shrouds are rod rigging, head-foil, covers for both mainsail and wheel, winches all disassembled cleaned and greased, and nearly new settee cushions. Recently installed ‘V’ berth, 13 bags of sails, Yanmar diesel, Garmin chart plotter, large leather wrapped wheel and 2021 bottom paint. Last year lots of labor on the boat leading up to a 2-week trip to the San Juans which resulted in our choice this year to sell and move on to a larger boat. It does need continuing attention on a few projects to remain in functional condition
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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