The Letov Š-137 was an ambitious and unusual Czechoslovak transatlantic airliner concept proposed by Letov Kbely in 1926. Designed by engineer Alois Smolík, it was one of the company’s most unconventional aircraft projects of the era.
The proposed aircraft was planned to use seven 350-hp Škoda Type T engines. Four engines would be installed inside the thick wings, while three more would be placed in the aircraft’s blunt forward fuselage.
Its design featured a distinctive box-like, three-deck fuselage built around vertically arranged twin booms. Passengers would sit below the mid-mounted wing, while the crew areas and galley were positioned above.
Engineers reportedly claimed that the aircraft could remain airborne with only three engines operating. However, the Š-137 never moved beyond the design stage and remained a paper project.
