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Susurrous is a ketch rig yawl that has been well-maintained and wants for nothing. She has fresh sails and comes with a set of older sails. She has a battened mainsail and a newer furling jib. She also has a newer forestay with Hood roller furling and a Jiffy reefing mainsail, plus covers for the mainsail, mizzen, and cockpit. Susurrous buff-colored painted spars and booms are aluminum. Her sail plan and rigging are exact to L. Francis Herreshoff specifications.
She has tiller steering for a keel-hung rudder. Below deck offers a simple cabin with a comfortable v-berth for two, new v-berth cushions, and a galley with a hand pump and stove. She has a reliable electric Thunderstruck engine and easily cruises at 6 knots at 1,500RPM.
Equipment: Engine: Thunderstruck Electric Direct Drive 2/1 Revolution. 48 volt system on four 12 AGM deep cycle batteries. Hours: less than 10 Engine Year: 2014 Range: About 12 nautical miles or 3 hours cruising at 4 knots and leaving 20% remaining capacity in the batteries). Water Capacity5 Gallons Tiller Steering VHF Wind Speed & Direction - Handheld Compass Battened Mainsail Furling jib (2017) Mizzen Hood Winch (1985) Jiffy Reefing Mainsail Hood Roller Furling Forestay (2017) Mainsail Cover Mizzen Cover New V-berth Cushions (2021) Four new AGM deep cycle batteries (2021)
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)
The plans for the ROZINANTE first appeared as part of an article authored by the designer for ‘The Rudder’ Magazine.
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