Dornier Do 20

The Dornier Do 20 was a proposed commercial flying boat designed in the mid-1930s as an improved and enlarged version of the Do X flying ship of 1929. The Do X had been under-powered despite six pairs of engines mounted above the wing, and only three were built. Dornier proposed to overcome this by replacing the pylon-mounted engines with four pairs of diesel engines of about 1,000 horsepower each, every pair fitted into a nacelle faired into the wing leading edge and driving one of four propellers. A model was shown at the 1936 Stockholm aviation exhibition, but no orders came and no Do 20 was ever built.