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The Arado Ar 231 was a light-weight seaplane developed during World War II in Germany as a scout plane for submarines. The need to be stored inside the submarine neccesitated compromises in design that left the single-seat seaplane of little practical use.
Testing soon discovered them to be fragile, underpowered, and difficult to fly even during calm weather, and as a result, development ended. Some of that testing was done on the auxiliary cruiser Stier, two of the six prototpes being taken on one voyage. The plane itself was powered by a 160hp Hirth HM 501 engine, weighed around 1000kg, and had 10m wingspan.
