The Do 18 was designed as a transatlantic mailplane and, although 170 examples were built, it was unsuccessful as a military aircraft, underpowered by Jumo diesel engines, cramped and not all that seaworthy apparently. D-ANHR made a record flight of 8435 km (5241 miles) from the catapult ship Westfalen off the English coast to Brazil on 27-29 March 1938; it did not reach the intended destination, Rio de Janeiro. Afterwards it was tested with BMW 132 radials, becoming the sole Do 18L. Photo from: Nationaal Archief (Netherlands)