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Downwind polar diagram to determine potential yacht speeds at various wind speeds for a sailboat. A polar diagram, or polar plot, is a graph that shows a sailboat's potential speed over a range of wind speeds and relative wind angles. [1]
The Davis class patrol boats are a six-boat class of patrol gunboats, operated by the Texas Department of Public Safety Texas Highway Patrol Division for patrolling the Rio Grande. Each boat has an armament of five FN M240 7.62 mm (0.300 in) medium machine guns , and is powered by three 300 hp (220 kW) outboard engines .
One of that war's outstanding warplanes, the North American P-51 Mustang, was designed using mathematical charts and tables rather than lofting tables. [5] Lofting is the transfer of a Lines Plan to a Full-Sized Plan. This helps to assure that the boat will be accurate in its layout and pleasing in appearance.
Boat building is the design and construction of boats (instead of the larger ships) — and their on-board systems. This includes at minimum the construction of a hull , with any necessary propulsion, mechanical, navigation, safety and other service systems as the craft requires.
Task Force 72 originated in Australia in 1994, when a number of individuals building radio controlled models came together to form a voluntary association.. The name derives from the military term for a group of warships operating to a common purpose, a task force, and the scale of the ship models being built (1:72).
USS PT-96, built by Huckins at Jacksonville, Florida, underway at high speed, circa 1942. Huckins Yacht Corporation built PT boats for two squadrons during World War II. In 1940, three governing bodies – the Bureau of Ships, the Board of Inspection and Survey, and the Navy Personnel Command – had agreed that all PT boats developed up to that time were defective.
Sketch by Tudor shipwright Mathew Baker. A ship must be designed to move efficiently through the water with a minimum of external force. For thousands of years ship designers and builders of sailing vessels used rules of thumb based on the midship-section area to size the sails for a given vessel.
The 387 is a modified 380, which replaced the C380 and C390 boats. The 387 is a superior cruising and performance boat, but production was stopped in 2009 due to the down turn in the economy in 2008. The C387 was eventually replaced with the C385 which was smaller, lighter and cheaper to build, but was considered a new design.