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I am reluctantly parting with my shoal draft trailerable sailboat that has taken us on many long cruises around the Great Lakes. It’s comfortable and roomy below with lots of storage area, an enclosed head in the forward V and a galley with water and an alcohol stove,. The shoal draft keel makes for a deep companionway below that allows me to stand in the cabin (I’m 6’1”) with a custom made dodger that expands the cabin living area. The very reliable 10 HP Honda engine is in an enclosed engine compartment for ease of access and quiet running.
Equipment: Roller furling that can be set and adjusted from the cockpit Main, 110 and 150 jib sails Heavy duty trailer with a custom tongue extender 2 burner alcohol stove Galley sink with water pump Porta-potty in a private area in the bow that is set up for pump outs Depth and speed instruments Compass that can be read from cockpit or cabin A custom made dcckpit dodger Mosquito netting for companionway and forward hatch Stern ladder A Magna Marine BBQ grill that is attached off the stern A solar hot water shower Brand new VHF radio Digital AM/FM radio that accepts CDs and thumb drives A repositioned water tank bladder A 35 lb Danforth and 10 lb light anchors All the necessary lines, cushions and then some 10 HP Honda four stroke with 6 gallon gas tank In cockpit engine controls
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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