The Dornier Do 20 was a proposed commercial flying boat designed in the mid-1930s. It was envisaged as an improved and enlarged version of the Dornier Do X Flugschiff (flying ship) that first flew in 1929. The Do X was not entirely successful, being under-powered despite using six pairs of engines mounted above the wing, and only three were built. Dornier proposed to overcome the shortcomings of the Do X by replacing the pylon-mounted engines with four pairs of diesel engines each of about 1,000 horse power, each pair fitted into a nacelle fared into the leading edge of the wing and driving one of the aircraft's four propellers.
A model of the aircraft was exhibited at the 1936 International Aviation Exhibition in Stockholm (ILIS) and details were published in the 1937 edition of Jane's All the World's Aircraft . No orders were received and no Do 20 aircraft were ever built.
Grey, C.G., et al., ed. (1937). Jane's all the World's Aircraft, 1937 Edition. London: Sampson Low, Marston & company, ltd.
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