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A V-drive is a power transmission system for boats that consists (usually) of two gearboxes, two drive shafts, and a propeller.. Whereas the conventional arrangement sites the engine with its gearbox aft, driving the propeller shaft directly, in a "V-drive" layout, the engine is reversed, to have the gearbox in front.
Outboard motor shaft lengths are standardized to fit 15-, 20- and 25-inch (38-, 51- and 64-centimeter) transoms. If the shaft is too long it will extend farther into the water than necessary creating drag, which will impair performance and fuel economy. If the shaft is too short, the motor will be prone to ventilation.
Boats can be refueled at sea using side by side procedures, and run on #2 diesel fuel. Weather survivability includes Sea State 5 survival at the best heading, and full operational capability at Sea State 3, including 20 knots (37 km/h; 23 mph) patrol speed and 10 knots (19 km/h; 12 mph) sustained loitering speed for 12 hours.
Length overall (LOA, o/a, o.a. or oa) is the maximum length of a vessel's hull measured parallel to the waterline. This length is important while docking the ship. It is the most commonly used way of expressing the size of a ship, and is also used for calculating the cost of a marina berth [1] (for example, £2.50 per metre LOA).
Following World War II the US Navy had little use for fast attack craft, and most of her PT boats were disposed of shortly after VJ Day.With the involvement in the Vietnam War the Navy saw a renewed need for small combatant craft for "brown water" operations, and they approached the Norwegian Westermoen company, which had built a prototype fast attack boat, the Nasty, and was currently ...
These boats are also known as "megayachts", "gigayachts" and even "terayachts", usually depending on length. [ 1 ] [ 2 ] It has been generally accepted by naval architects and industry executives that superyachts range from 37 m (≈120 ft) to 60 m (≈200 ft), while those over 60 m are known as megayachts and boats over 90 m (≈300 ft) have ...
The displacement–length ratio (DLR or D/L ratio) is a calculation used to express how heavy a boat is relative to its waterline length. [1] DLR was first published in Taylor, David W. (1910). The Speed and Power of Ships: A Manual of Marine Propulsion. John Wiley & Sons. p. 99. [2]
Name Number built Year of first construction Designer Builder Notes 420: 56,000: 1959: Christian Maury: Several [12] [13]470: 1963 Christian Maury Several [14] [15]505: 1954