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53’ Bruce Roberts Pilothouse Ketch
$99,000
LLYR is a Roberts 53’ ketch commissioned in 2002 as the personal vessel of American NOAA mapper, Captain Ben Smith. She’s a modified Bruce Roberts 45’ steel ketch with a 16’ beam, full keel and skeg rudder. She has a raked bow with a rounded chine. The rudder is on an extended rudder shoe, and the transom is plumb with a boarding ladder. She has an 80 hp freshwater cooled Perkins diesel engine, carries 193 gallons of fuel, 343 gallons of fresh water and 35 gallons waste water. On deck forward is a welded-on steel bowsprit with double anchor bow rollers, stainless steel bow railing, and genoa furling unit. Aft of the sprit are the anchor lockers, twin stays for the staysail, and an electric anchor windlass. Moving aft from the foredeck, the raised cabin trunk is fitted with stainless steel handrails and Lewmar deck hatches on top and opening ports along the sides. Further aft, the cabin trunk steps up to form the pilothouse, which has fixed windows on all sides. The decks are surrounded by short gunwales and stainless steel lifeline stanchions with double courses of lifeline wire. The cockpit has built-in surround-bench seating and a console-mounted stainless steel wheel. The steering console is fitted with folding table leaves and also supports engine controls and a Raymarine hybrid-touch multifunction chart plotter. The aft deck area is flush and is fitted with four deck hatches that open to the LPG tank locker and deck gear storage. The aft deck is surrounded by stainless steel railings. There is a set of dinghy davits over the transom.
Survey completed 12/22 by All Island Marine Survey LLC
New exterior paint, deck paint and bottom paint 09/21
(6) Trojan 6vdc battery bank 09/21
Raymarine 12’ chart plotter 01/19
New standing rigging 05/17
B&G gages 01/17
ICOM IC M710 SSB transceiver with AT-130 Auto-tuner
Standard Horizon VHF/AIS
12’ Achilles tender & 5hp motor
Equipment: - Cruising speed: 6.5 kn - Cruising speed RPM: 2200 - Max speed: 7 kn - Max Speed RPM 2600 - Range: 1100 nmi
Dry weight: 28,000 kg
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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