Recently, after 20 years of research, the French international express shipping company has developed a BGV ship with high-speed performance and large carrying capacity developed by a huge investment of about 25 million US dollars. It has excellent carrying capacity and other high-speed ship types cannot match. Airworthiness and high speed performance.
BGV is the abbreviation of Bateau a Grande Vitesse, meaning "majestic and fast ship", originated from the famous TGV high-speed train in France. The ship's hull is slender and the bow is prominent, and the shape is very smooth and beautiful. The BGV can be said to be a branch of a trimaran. However, due to its aerodynamic design principles such as surface effects, its speed performance is superior to that of a general trimaran.
The main body of the BGV is a long and narrow deep V-shaped intermediate hull. Each side of the rear part of the hull has an outrigger with a large elongated pontoon. The two pontoons and the intermediate hull form a three-body structure. The stern has a large vertical rudder similar to the aircraft. The outrigger is a streamlined section similar to the wing, with movable flaps on it, and a central hull at each of the bottom pontoons. Tilting movable stabilizer fins.
At high speeds, the narrow intermediate hull can significantly reduce the resistance of water and air and smoothly cut the water surface. In the face of sudden surges or big waves, the waves can be smoothly broken and the longitudinal sway of the hull can be minimized. The movable flaps can move in a two-dimensional plane to control the airflow through the beam to form a surface effect air cushion, which in turn facilitates lifting the hull. In addition, the pontoon stabilizing fins that maintain a positive angle of attack can also provide some lift. The total hull drainage can be reduced by 15%-20% at high speeds, while shallower drafts mean lower sailing resistance. In addition, surface effect air cushions also help to improve navigation stability. The pontoon under the beams on both sides acts as a stabilizer, and the stabilizing fins below the pontoon also reduce the hull roll.
The BGV has a very low freeboard and the boat is as compact and streamlined as possible. Some models of BGV have even a cab that blends with the hull contour, which not only effectively reduces air resistance, but also The low overall structure also increases the stability of the hull. At the same time, this structure also enables BGV ships to be constructed with thinner steel plates, which can greatly alleviate stress and vibration problems. These designs allow the BGV to not only have excellent high-speed continuous navigation and navigation stability, but also make the hull less sensitive to changes in internal loads and easily maintain lateral balance.
The high speed of the BGV is not its biggest advantage, but it can be maintained at all speeds under various weather conditions. The average annual flight cancellation rate due to weather is less than 1%. . The existing fast ferries of other ship types are scheduled to be suspended for 3-4 months each year due to weather factors. At the same time, due to the weight sharing of the pontoons on both sides, the draught of the BGV type ship is also significantly reduced compared with the ships of other ship types of the same tonnage, so it can operate in shallow waters and the docks that can be docked are more extensive.
The BGV C series is a freight type ship developed by BGV, also known as a high-speed water jet propulsion ship. There are three main models, all of which are designed with a ro-ro ship. The stern has a large hatch that allows the vehicle to enter and exit the full cargo hold deck of the ship.
The BGV C series can sail at 35 kn in various sea conditions (additional if necessary), which is similar to the average speed of large trucks on land in Europe, but the BGV C carries more traffic and avoids traffic jams. . It is estimated that if a freight company replaces a truck with a BGV C cargo ship, the transportation time will be reduced by half compared with the current one (the flight cancellation caused by extremely bad weather has been counted).
Compared with other existing large-scale high-speed ship designs, BGV ships have better performance in terms of speed, stability or dock adaptability, and their tonnage scale has exceeded the level of existing high-speed ships. Wide range of uses, so the application of the future can not be underestimated, is expected to become a future shipping star.
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