The Bartini A-57 was an experimental Sovietbomber of the mid-1950s that was designed by Robert Ludvigovich Bartini to take-off and land on water. The aircraft was never put into production.
The A-57 was equipped with a thruster facing downward to assist its take-off from the surface of the ocean. It was intended to refuel from submarines out at sea. The bomber had a long, slender delta wing. It was tested in wind tunnels, but the project was scrapped in 1957 before actual production could begin.