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Tinaca has been cruising in the western Caribbean for the last 5 years, spending almost all our time between Panama and Colombia. She is a joy, at the anchor or in a marina. This is a Morgan Nelson/Marek 45-4 cruiser, fast and efficient to sail and comfortable as a live aboard; it consists of two large cabins and two heads, a wide dinette with settee double berth and settee single berth. She is able to accommodate up to 7 people. The galley has deep double sinks with hot and cold pressure water and a front load refrigerator in a 10-cubic foot icebox. There is a foot pump in galley sink, stove w/oven fueled by a 20lb LP tank housed in the aft locker. Two Marine Air System units provide air conditioning. Everything on the vessel functions as it should. Bimini and spay hood are in good shape. All canvas and sails in excellent condition. The new main sail is fully battened, the second main is not battened, with lazy jacks and bag. The heavy genoa 130% is almost brand new, while the secondary genoa 130% is in good shape. Hauling and painting is scheduled for June 2023. There are new anodes on the shaft and on the Maxprop blade folding prop. Rigging includes a hydraulic backstay and spinnaker tackle, roller furled genoa. There is a Maxwell electric windlass with remote controls at helm station and a Delta anchor with 200 ft of 3/8 chain, plus a Bruce anchor with nylon rode. There are a swim ladder and two convenient stern platforms for diving. The dinghy is an older Walker Bay with 2-year-old Suzuki 15 hp two-stroke outboard. The engine is the original Universal Atomic Diesel 34hp; in the last years it has been constantly maintained: injectors and fuel pump have been calibrated, head gasket and fresh water pump have been replaced. Alternator and starter have been maintained last year. Electronics include E 120 chart plotter, radar, ST 70 depth, speed, and wind instruments, Raymarine type 2s piston autopilot, Icom VHF, new stereo and speakers. Basic systems are working but there are a few updates needed: the four AGM batteries, battery charging system, TV, liferaft.
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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