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Hydrofoiling wingsail catamaran 17. A sailing hydrofoil, hydrofoil sailboat, or hydrosail is a sailboat with wing-like foils mounted under the hull.As the craft increases its speed the hydrofoils lift the hull up and out of the water, greatly reducing wetted area, resulting in decreased drag and increased speed.
A motor soft starter is a device used with AC electrical motors to temporarily reduce the load and torque in the powertrain and electric current surge of the motor during start-up. This reduces the mechanical stress on the motor and shaft, as well as the electrodynamic stresses on the attached power cables and electrical distribution network ...
Glass fibre is the fibre most frequently used for filament winding, carbon and aramid fibres are also used. Most high strength critical aerospace structures are produced with epoxy or polyurethane resins, with either epoxy, polyurethane or cheaper polyester resins being specified for most other applications.
The starter motor is a series, compound, or permanent magnet type electric motor with a solenoid and solenoid operated switch mounted on it. When low- current power from the starting battery is applied to the starter solenoid, usually through a key -operated switch, the solenoid closes high-current contacts for the starter motor and it starts ...
The reaction ferry uses the power of the river to tack across the current; the powered cable ferry uses engines or electric motors (e.g., the Canby Ferry in the U.S. State of Oregon) to wind itself across; or is hand-operated, such as the Stratford-upon-Avon chain ferry in the UK and the Saugatuck Chain Ferry in Saugatuck, Michigan, United States.
While paddles and sails are still used on some smaller boats, most modern ships are propelled by mechanical systems consisting of an electric motor or internal combustion engine driving a propeller, or less frequently, in pump-jets, an impeller. Marine engineering is the discipline concerned with the engineering design process of marine ...
The vessel was a refitted schooner which carried two cylinders (or rotors) approximately 15 metres (50 ft) high, and 3 metres (10 ft) in diameter, driven by an electric propulsion system of 50 hp (37 kW) power. [citation needed] The Buckau sailed from Danzig to Scotland across the North Sea in February 1925. [9]
Since the forces on the sail are resisted by forces in the water (for a boat) or on the traveled surface (for an ice boat or land sailing craft), their corresponding forces can also be decomposed from total aerodynamic force into driving force (F R) and lateral force (F LAT). Driving force overcomes resistance to forward motion.