Avia 51

The Avia 51 was a three-engined high-wing cantilever monoplane designed for the Czech national airlines CLS. It was built with a duraluminium monocoque fuselage and a fixed tailwheel landing gear. Powered by three Avia Rk.12 radial engines, two were fitted into the leading edges of the wing and one was nose-mounted. It had a two-man flight deck and an enclosed luxury cabin for five or six passengers which was not large enough to stand up (5 ft 1in), but did have a separate lavatory compartment, it also had three luggage and mail compartments.

The Avia 51 entered service on the Berlin-Prague-Vienna route, but with only a small passenger capacity it proved uneconomical to operate. In 1937 the aircraft were sold to the Estonian government One appeared operating for the Spanish Republican Air Force in the Spanish Civil War, and it was reported that the other two were lost at sea when the freighter carrying them to Bilbao was sunk.