12/29/2014. Remarks by Johan Visschedijk: "Built towards the end of 1917, the unarmed WD 15 patrol seaplane was little more than an enlarged WD 12 with ply-skinned fuselage and fin. It was the most powerful and also the last single-engined machine to be supplied by Gotha to the German Navy. Only two were built, serial 842 and 843, powered by a 260 hp Mercedes D.IVa."

Span: 56 ft 5.25 in (17.20 m)
Length: 36 ft 9 in (11.20 m)
Wing area: 697 sq.ft (64.50 sq.m)
Empty weight: 3,399 lb (1,545 kg)
Loaded weight: 5,060 lb (2,300 kg)
Max speed: 95 mph (152 kmh)
Service ceiling: 13,780 ft (4,200 m)