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Tosca - 1978 Nor’Sea 27 This is a well-built and well-maintained Nor-sea 27’ blue-water cruiser designed by Lyle Hess. This lapstrake double-ender is capable of circumnavigation and is one of the largest legally-trailerable sailboats made.
The hull, deck and rigging are solid. New bottom paint and complete wax job in 2023. Beautiful woodwork. Look for the numerous articles written about the merits of this blue water cruiser and see NOR’SEA 27 - sailboatdata for full specs.
Equipment: Engine Yanmar 20hp with less than 50 hours
Sails Cruising mainsail w/ triple reefs Working jib, drifter All halyards, sheets, and spares Whisker pole Other sails
Electronics Chart plotter Depth sounder Compass Ritchie Self-steering auto pilot VHF marine radio Cabin lights LED (both red and white)
Ground Tackle 35# Bruce CQR Anchor on Bow roller 40’ - chain 200’ - rode
Electrical 2 batteries masthead light Spreader lights
Canvas New dodger Mainsail and tiller covers Cockpit cushions New interior cushions
5 bronze winches Spare handles and parts
Interior Forward V-berth with cushions 2 quarter berths in stern with cushions All wood interior Cushioned saloon seating Adjustable-height table Chart table New thru hulls Double-sink with foot-pump Wood stove Ice box Origo alcohol stove Fully-contained head with Raritan toilet
All USCG safety equipment Offshore harness and tether 4 fenders, 8 dock lines Hatch screens
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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