The Aist class

The Aist class was built to roughly the same size as the British SR.N4 commercial channel ferry. The Russian name for this class is "maly desantny korabl na vozdushnoy podushke" meaning "small air cushion vehicle". The Aist class prototype was built in 1970 and the type entered production in Leningrad in 1975. It was produced there at a rate of about six every four years. By the early 1990s twenty to twenty four had been produced. They began to be withdrawn following the fall of the Soviet Union, and by 2004 only six remained, in two levels of configuration. A modified main engine intake was installed on all Russian Navy Aists in service with the Baltic Sea fleet. These intakes are believed to include special filters to reduce the ingestion of salt water, sand and dust particles into Aist's engines and machinery, limiting the effects of salt water corrosion. The Aist have suffered from high cushion pressure, and produce exceptionally heavy cushion spray, especially at low speeds.

The Aist-class was built to roughly the same size as the British SR.N4 commercial channel ferry. The Russian name for this class is "maly desantny korabl na vozdushnoy podushke" meaning "small landing craft on air cushion". The Aist-class prototype was built in 1970, and the type entered production in Leningrad in 1975. It was produced there at a rate of about six every four years. By the early 1990s, twenty to twenty four had been produced.

The craft began to be withdrawn following the fall of the Soviet Union, and, by 2004, only six remained, in two levels of configuration. A modified main engine intake was installed on all Russian Navy Aists in service with the Baltic Sea Fleet. These intakes are believed to include special filters to reduce the ingestion of salt water, sand and dust particles into the Aist's engines and machinery, limiting the effects of salt water corrosion. The Aist's have suffered from high cushion pressure, and they produce exceptionally heavy cushion spray, especially at low speeds.

In addition to the Baltic Sea upgrades, several variants have been built, and they differ externally in fin height, overall length, superstructure details and defensive armament. In an effort to reduce accidents, an Aist combat mission simulator was produced by the former Soviet Navy to improve the ability of Aist commanders to operate the craft on the sea and over beach.