The Saab 401 MEFA was an experimental air-cushioned vehicle with a weight of 2 tons and capable of about 40 knots on open water with two people on board.

The Navy retired the project in 1967 when it donated the 401 prototype to the Maritime Museum in Karlskrona Sweden.

[3][4][5][6] MEFA is the Swedish acronym for Markeffektfarkost (ground effect vehicle); the craft was also known as the "MEFAN".

[7][11] The vehicle's lift was created by an eight-blade fan, driven by a 180 hp Lycoming O-360 piston engine.

[7] Instead, the vehicle was designed so that it could withstand direct contact with the lake and solid surfaces such as ice.