Dornier Do 20
The Do 20 flying boat project was a development of the Do X. II was to be used on transoceanic services. The planned range was more than 5000 km, the planned maximum speed approx. 340 krn/h. The cabin configuration was either for 12-16 passengers with spacious lounges and sleeper compartments. or seating for some 60 passengers.
The hull had a more favourable aerodynamical design than that of the Do X, but the under-water shape and the sponson arrangement remained unchanged. The braced wing had the same rectangular planform with rounded wing tips than the Do X, but its span was extended by one metre- The greatest progress was to be achieved over the Do X by more powerful engines: 8 diesel engines rated between 800 and 1000 HP each The engines were completely integrated into the wing and were to drive one large propeller each via a gearbox and an extension shaft.
The Do 20 model was exhibited by Domier at the 1936 International Aviation Exhibition in Stockholm (ILIS). A development contract was never awarded by Deutsche Lufthansa.

Type Transatlantic passenger carrying flying boat  (15 - 16 passenger in high comfort, 60 passengers short distances)
Engine 8 Diesel engines  (2 coupled driving one prop. through gearbox and shaft)
Dimensions Length 40.0 m, height 9.50 m, span 40.00 m, wing area
Weights Empty 29500 kg, load 26500 kg, flying weight  56000 kg
Performance Max. speed ~340 km/h, cruising speed ~250 - 300 km/h