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Most boats have a positive PHRF rating, but some very fast boats have a negative PHRF rating. If Boat A has a PHRF rating of 15 and Boat B has a rating of 30 and they compete on a 1 mile course, Boat A should finish approximately 15 seconds in front of Boat B. Results are adjusted for handicap by the race committee after all competitors have ...
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.
The boat had a displacement of 55 long tons (56 t) (fully loaded) and was 80 ft (24 m) in length, with a beam of 20 ft (6.1 m), and a draft of 5 ft 6 in (1.68 m). Her three liquid-cooled, supercharged, 12-cylinder 1,350 shp (1,007 kW) Packard 4M-2500 engines each drove a single shaft, giving the boat a top speed of 40 knots (74 km/h; 46 mph).
Motor Torpedo Boat Squadron Three (MTBRon 3) was a United States Navy squadron based at Naval Base Cavite, Cavite, Philippines, from September 1941 to December 1941. It was commanded by Lieutenant John D. Bulkeley and made up of six motor torpedo boats : PT-31 , PT-32 , PT-33 , PT-34 , PT-35 , and PT-41 , the last as the squadron flagship .
American Power Boat Association: Halter 200 Lake Pontchartrain, New Orleans, Louisiana [2] 1982 American Power Boat Association: Michelob Lite New Orleans Lake Pontchartrain, New Orleans, Louisiana [2] 1983 American Power Boat Association: Popeyes Offshore Grand Prix Lake Pontchartrain, New Orleans, Louisiana: 1984 American Power Boat Association
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Newest technology and modern materials, such as carbon, kevlar, nomex, new types of polymer resin are used to construct boats. Costs of materials and manpower are high, same as in other Formula classes. That is because of high performance is need and high safety. Modern F-4s boats, like older classes, are equipped with 3000N/sm2 safety cockpits.
These range from 2-, 3-, and 4-cylinder models generating 15 to 135 horsepower (11 to 101 kW) suitable for hulls up to 17 feet (5.2 m) in length to powerful V6 and V8 cylinder blocks rated up to 627 hp (468 kW)., [2] with sufficient power to be used on boats of 37 feet (11 m) or longer.