The W.4 was a sea-plane development of the D.I and 117 were built for the German Navy to defend coastal naval bases from attack. Most were stationed at North Sea bases from early 1917, but a small number were deployed around the Aegean Sea area.
The W.4 was a two-seater powered by the 160-hp Mercedes D.III, and normally armed with one or two Parabellum 7.92-mm machine-guns in the rear cockpit.
Engine: 1 x Mercedes D III, 125kW
Wingspan: 9.5 m / 31 ft 2 in
Length: 8.5 m / 27 ft 11 in
Height: 3.7 m / 12 ft 2 in
Wing area: 31.6 sq.m / 340.14 sq ft
Take-off weight: 1070 kg / 2359 lb
Empty weight: 790 kg / 1742 lb
Max. speed: 160 km/h / 99 mph
Ceiling: 3000 m / 9850 ft
Range w/max.fuel: 450 km / 280 miles
Armament: 2 machine-guns