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Knot Tipsy, an ODay 26 fresh water boat and trailer. Boat listed weight is 4,800 lbs, Boat and Trailer approximately 7,500lbs, ballast 1,850 lbs., beam 8 -0 Swing keel for draft 2.5 to 6.0 feet. Ready for club racing or coastal cruising. Comfortable cockpit with cushions, bimini, lazy jacks and cockpit control for main halyard, jiffy reefing and spinnaker set up. Self -tailing winches on roller furling jib. Winch handle pockets and drink holders.
Equipment: Sails (2017, 2018) include triradial main and 110% jib, 85% jib and 150% reacher also includes older 150% and 130% genoa, storm sail and spinnaker in sock. Running rigging is in excellent condition. Outboard engine 6 HP 1990 6RLES Johnson 2 cycle One 12V battery and battery switch (dual) and 300w inverter Shore power and 120 volt outlets Depth meter, hand held VHF, Cabin lights and running lights. Porta potty set up for on-water pump-out. 2 anchors, gas barbeque, mosquito cover on forward hatch, air conditioner, Life jackets and throwable The trailer is heavy duty using two 5000 lbs axels and a 2 5/16 ball hitch.
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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