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Selling LIBERTY our 1975 Pearson 10M hull #96 (336feet, 11 beam, 5 11 draft, 12,441# displacement, 5,445# ballast, hull speed 7.25kts), after 39 wonderful years of ownership. Shes a perfect SF Bay and Delta family sailboat. Mostly day sailed with occasional anchor outs. Easily sailed solo, shes been well maintained. All records are available. The Perkins 30hp diesel has 1,000 hours and a recent service. Quantum sails. New bottom last November. ProFurl with 120% jib 220sf. Loose footed Main 320sf. Wide side-decks. Shes a classic 70s well built and clean family cruiser. The ask is $27,900 Wed like to find the buyer appreciative of the Pearson brand and William Shaw design. Robinson27@aol.com (415) 312-3152 cell
Equipment: 25# CQR anchor. Spare parts, Lewmar 43 2-speed winches, new VHF radio, 3 bladed prop 13X11 RH, Datamarine Windspeed, Awl Gripped Flag Blue, 40 gallons water, 20 gallons diesel, Dodger, fenders, hot water heater and pressure system, chart table, 3 burner stove and oven
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 10M came with several different engine installations. Most were powered by the Atomic Four gas engine. Diesels were optional with a Faryman 25hp in 75, a Westerbeake 20hp diesel in 76. the Faryman again in 77, and a Volvo 23hp (MD11) from 78-80.
Available with a taller rig:
I(IG): 46.00’ / 14.02m
J: 14.20’ / 4.33m
P: 40.50’ / 12.34m
E: 11.00’ / 3.35m
SA %100: 549.35 sq.ft. /51.03m2
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