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21 foot fixed keel racer that has a self-tacking jib for single handed racing. I love this boat but I am moving to Florida. I paid for the slip in the Marina for this season.
Equipment: GP main (with flicker) and jib and sail cover. Only sailed lightly. The ZZ Black aramid laminates uses a combination of Technora Black and Twaron Black fibers to build a range of laminates. New jib block, high tech line and halyards. New Harken lazy jack. Recently painted trailer. 2 seasons old - Suzuki DF2.5 portable outboard is the smallest Suzuki 4-stroke to date. Weighing just 30 pounds, the DF2.5 is the lightest Suzuki 4-stroke motor ever built. Suzuki is also proud to note that the DF2.5 meets the rigorous EPA 2010 and CARB 3-Star Ultra Low emissions standards. A 2.5 HP single cylinder OHV 4-stroke engine, with 4.15 cu. in. displacement, generates plenty of power for small tenders and inflatables. It features easy-to-pull recoil starting with Suzuki Pointless Electronic Ignition. Includes spinnaker.
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)
Thanks to ‘Warren’ for providing updated information.
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