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1986 X Yachts –3/4 Ton Mk II; Asking Price $14,999
Elliptical keel and rudder, tall rig; boat has been completely refurbished and repainted (Awlgrip) – deck, hull and interior; all running rigging has been continuously updated and is in excellent condition; 24 HP Buhk Diesel, runs excellent; full Garmin Nexus Instrument package installed. Bottom is VC 17 in racing condition.
2017 North 3Di 155%; 2015 Doyle Stratis Main; 2015 Doyle 0.5 oz Spinnaker; sails have been lightly used, are in excellent condition and very competitive; multiple sets of additional competitive racing sails included.
Excellent race record, including club, regional, and Mackinac races. Multiple time Western Lake Erie Boat of the Year.
Custom built triple axle, 9 pad trailer also available for additional cost – call for details on trailer. Trailer is in excellent condition; is road ready, and can deliver the boat anywhere in the country with the right tow vehicle.
More Pictures and additional details available upon request.
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)
See IRWIN 33/IRWIN 33 MKII.
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