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Viper 830, hull #12. Triad Trailer, 6hp Mercury Outboard, Deck refinished with textured gelcote and awlgrip and griptex top coat. Epoxy bottom w/ VC17, Updgraded deck layout, numerous sails, including unused Doyle Stratis Squaure Top Mainsail, 12volt electrical with dual automatic bigle pumps, running lights, new lifelines, two rudders and 2 sprits. Carbon tiller finished in Awlgrip, upgraded running rigging and much more. The boat was refurbished over the winter of 2019 and spring 2020. Keel box reinforced and internal hull structure bonded to insides of hull and rebuilt mast step. Original VanDusen carbon spar with new halyards, standing rigging and lower spreader bar. Dual top mast backstays with course trip and fine trim led along cockpit sole The mast was damaged in transit and fractured where it sets in the deck support about four feet below the forestay intersect. Mast builder advised that this is easily repairable and has offered engineering and support. I have lost interest and would like to sell this. The boat is a 90% completed restoration and outside of the mast repair only requires minimal effort to get out on the water. I’m happy to discuss this more and outline the work put into the boat and provide receipts.
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)
Spinnaker area: 927 sq. ft.
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