The peculiar Delphin were produced Dornier in the 1920’s as single-engined a small commercial flying boat to compliment their larger tandem-engined Wals. With those iconic Wals the Delphin shared the squared low-aspect ratio wing surfaces and the household stummels. Three basic models were produced with each one characterised by its increased in power and payload. The Delphin III was the most powerful of them and could take 10 passengers. They had few takers.
With its BMW VI perched above the “nautical” cabin, these were a strange kind of dolphins. Anyway, that engine configuration again.