Baldwin made his own design after studying the design of Italian inventor Enrico Follanyi. 19 10, Bell met Follanyi in Italy and tried to take Follanyi's hydrofoil boat on the lake. After returning to the United States, they built HD-4 and reached a speed of 87 kilometers per hour. With the support of the US Navy, they switched to two engines with 350 horsepower (260 kW), which set a record of 19 14 km/h in September 2009. This record has been maintained for ten years. Baron von Schelter, a German, studied hydrofoils in Germany during World War II. After the war, most of the research departments in Schertel were captured by the Soviet Union and became the backbone of hydrofoil development in the future.
Schertel personally went to Switzerland and founded Supramar Company. 1952, he developed the first passenger hydrofoil PT 10, which weighed seven tons and could carry 32 passengers. It uses a U-shaped semi-submersible hydrofoil with a speed of 32 knots. Later, PT20, PT50, PT75, PT 100 and PT 150 were successively developed, mainly produced by Rodriquez of Italy and Hitachi of Japan, all of which were propelled by semi-submersible hydrofoils and underwater propellers.
The final product is PT 150, which adopts semi-submerged and fully submerged wings, weighs 165 tons, carries 250 passengers and has a speed of 37 knots. By the time 197 1 stopped production, Supramar hydrofoil had produced more than 150 ships. Some PT hydrofoils are still in service. After Rodriquez, there are semi-submersible hydrofoils developed by ourselves.
The Soviet Union has also been studying hydrofoils, and designed many streamlined hydrofoils, ferries and warships in the 1970s and 1980s. Among them, Meteor and Worthhold are exported abroad. Most of these hydrofoils are semi-submersible, mainly used in inland rivers and lakes with less waves.
The technology required by hydrofoils is very similar to aviation, so Boeing Company of the United States began to study hydrofoils in the 1960s. 1974, Boeing built six PHM fully submersible hydrofoil warships with a length of 13 1 foot. The ship is equipped with anti-ship missiles and 75 mm fast guns. The speed is over 45 knots. The engines are two 800 HP diesel engines (used before flight) and two 17000 HP GE marine gas engines (used in flight), which are propelled by water jet.
At the same time, Boeing has also developed a civilian hydrofoil named JetFoil929. Model 929 is also a fully submersible hydrofoil, and the hydrofoil can be put away into shallow water. The hull is 90 feet long and made of aluminum alloy, with a net weight of about 100 ton, carrying 250 passengers and a speed of 45 knots. Propulsion power comes from two Rolls-Royce Allison 50 1k gas engines, which are propelled by water spray devices.
Boeing Company produced 26 929 hydrofoils, and the buyers were ferry companies from Japan, Britain and Indonesia. Among them, the Far East hydrofoil (1999 merged with Hong Kong China Travel Service-Parkview Ferry Service Co., Ltd. in July, renamed as Jet Flying) under the Shun Tak Group of Hong Kong is the largest user, and 16 ships are used to provide services between Hong Kong and Macao (three of which have been sold to South Korea). After Boeing stopped producing JetFoil, it sold the production patent to Kawasaki Heavy Industries Co., Ltd. and produced about 15 ships. In the mid-1990s, CSSC Meihe Ba Sen Company, a subsidiary of China State Shipbuilding Corporation, also briefly authorized the production of two Far East hydrofoils (model PS-30) to Hong Kong (of which 65,438+0 were sold to South Korea).