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Finally, one of the main reasons pilots participate it these races is because this class is a shortest way to Royal Races. F-4s one of few classes which gives right to apply for super-license after having some experience (eight races according to UIM rules). F-4s boats have same steering as an elder classes, corrected to speed.
A motorboat with an outboard motor. A motorboat or powerboat is a boat that is exclusively powered by an engine; faster examples may be called "speedboats".. Some motorboats are fitted with inboard engines, others have an outboard motor installed on the rear, containing the internal combustion engine, the gearbox and the propeller in one portable unit.
Hull speed or displacement speed is the speed at which the wavelength of a vessel's bow wave is equal to the waterline length of the vessel. As boat speed increases from rest, the wavelength of the bow wave increases, and usually its crest-to-trough dimension (height) increases as well. When hull speed is exceeded, a vessel in displacement mode ...
Crusader was a jet-powered speed boat piloted by John Cobb. The combination of an aerodynamically stable hull form and turbojet propulsion was proposed by Reid Railton, Cobb's adviser. A rocket-powered scale model was tested at Haslar. The full size design was by Peter du Cane and built by Vospers of Portsmouth.
Blue Bird K4 was a powerboat commissioned in 1939 by Sir Malcolm Campbell, to rival the Americans' efforts in the fight for the world water speed record. The name "K4" was derived from its Lloyd's unlimited rating, and was carried in a prominent circular badge on the forward hull. As this was Campbell's second boat, it was also known as Blue ...
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Offshore powerboat racing was first recognised as a sport when, in 1904, a race took place from the south-eastern coast England to Calais, France. In the United States, the APBA (American Power Boat Association) was formed soon thereafter and the first U.S. recorded race was in 1911, in California.
Every team has one F-4s boat. The class has two single races per race weekend. The boats use a Mercury 60 HP stock EPA engine and reach a top speed around 120 km/h. F-4s runs 113 kilo 4 stroke motors rev-limited to 6250 RPM on very short tunnels. The top speed in competition is 120 km/h.