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The process of determining the PHRF for an individual boat begins with the regional PHRF rating, then adjustments are made for the individual attributes of the boat such as: modifications to the rig, the size of the largest foresail (jib or genoa), the size of the spinnakers, type of keel (full, fin, wing etc.), the number of blades on the propeller, and the style of the propeller (fixed ...
Many floatplanes, especially those since 1945, can have either conventional floats for operating just from water, or amphibious floats, which have retractable undercarriage built into them. Some experimental flying boats have used skis or hydrofoils to supplement their buoyancy when in motion, however they still rely on the buoyancy of a hull ...
Short S23 "C" Class or "Empire" flying boat A PBM Mariner takes off in 1942 Dornier X in 1932. A flying boat is a type of seaplane with a hull, allowing it to land on water. [1] It differs from a floatplane in having a fuselage that is purpose-designed for flotation, while floatplanes rely on fuselage-mounted floats for buoyancy.
By comparison, dual floats restrict handling, often to waves as little as one foot (0.3 metres) in height. [3] However, twin float designs facilitate mooring and boarding , and – in the case of torpedo bombers – leave the belly free to carry a torpedo .
USA-17—a 90-foot-long (27 m) trimaran, type BOR90. A traditional paraw double-outrigger sailboat from the Philippines. A trimaran (or double-outrigger) is a multihull boat that comprises a main hull and two smaller outrigger hulls (or "floats") which are attached to the main hull with lateral beams.
The third and fourth prototypes including a continuous glazed canopy (between the windshield and the rear position) and angled bracing struts between the vertical struts attached to the floats respectively. [8] In 1937, ten pre-production He 115s were completed; deliveries of production standard aircraft to the Luftwaffe commenced one year later.
A pontoon boat is a flattish boat that relies on nautical floats for buoyancy. Common boat designs are a catamaran with two pontoons, or a trimaran with three. [2] In many parts of the world, pontoon boats are used as small vehicle ferries to cross rivers and lakes. [3] An anchored raft-like platform used for diving, often referred to as a pontoon
The Martin P5M Marlin (P-5 Marlin after 1962), built by the Glenn L. Martin Company of Middle River, Maryland, is a twin piston-engined flying boat that entered service in 1951, and served into the late 1960s with the United States Navy performing naval patrols.