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The Northrop Grumman XRQ-73 SHEPARD (Series Hybrid Electric Propulsion AiRcraft Demonstration) is an hybrid-electric Group 3 unmanned aerial vehicle (weighting about 1,250 lb (570 kg)) developed by Northrop Grumman.
The capsize screening formula (CSF) is a controversial method of establishing the ability of boats to resist capsizing. It is defined for sailboats as: Beam / ((Displacement/64.2) 1/3), with Displacement measured in pounds, and Beam in feet. A lower figure supposedly indicates greater stability, however the calculation does not consider factors ...
USS George Washington Carrier Strike Group underway in the Atlantic USS Constitution under sail for the first time in 116 years on 21 July 1997 The United States Navy has approximately 470 ships in both active service and the reserve fleet; of these approximately 50 ships are proposed or scheduled for retirement by 2028, while approximately 110 new ships are in either the planning and ordering ...
G-73 Mallard at the Air Zoo. Building on the success of the Goose and Widgeon, Grumman Aircraft developed larger G-73 Mallard for commercial use.Retaining many of the features of the smaller aircraft, such as twin radial engines, high wings with underwing floats, retractable landing gear and a large straight tail, the company built 59 Mallards between 1946 and 1951.
The Grumman G-21 Goose is an amphibious flying boat designed by Grumman to serve as an eight-seat "commuter" aircraft for businessmen in the Long Island area. The Goose was Grumman's first monoplane to fly, its first twin-engined aircraft, and its first aircraft to enter commercial airline service.
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]
Antilles Air Boats was founded in 1963, and provided transport between St Thomas and St Croix in the US Virgin Islands as well as San Juan, Puerto Rico.Antilles Air Boats built up its fleet until it operated 27 aircraft, all propeller driven float planes from World War II which were well suited to the short hops over water the airline specialized in.
Three Canadair CL-215 amphibious flying boats. The following is a list of seaplanes, which includes floatplanes and flying boats.A seaplane is any airplane that has the capability of landing and taking off from water, while an amphibian is a seaplane which can also operate from land.