The KDW twin-float single-seat fighter seaplane was essentially a 1916 conversion of the land-based KD (D.I) to provide an interim aircraft for floatplane station defence. The only major change introduced on the prototype apart from provision of a twin-float chassis was some slight extension of the wings, but the fin area was later increased to compensate for the increased keel area resulting from the addition of the floats.
The prototypes were fitted with the 150hp Benz Bz III six-cylinder water-cooled engine, but apart from a preproduction batch of 10 similarly-powered aircraft, all subsequent examples of the KDW had the 160hp Maybach Mb III six-cylinder water-cooled engine.
The first production series was armed with a single synchronised 7.92mm LMG 08/15 machine gun mounted on the starboard side of the nose, but the final batch of 20 delivered between October 1917 and February 1918 had a gun mounted on each side of the cockpit and additional Vee-type interplane bracing struts.
A total of 58 KDW float fighters was delivered.
Engine: 1 x 160hp Maybach Mb.III
Max take-off weight: 1039 kg / 2291 lb
Empty weight: 759 kg / 1673 lb
Wingspan: 9.30 m / 31 ft 6 in
Length: 7.86 m / 26 ft 9 in
Height: 3.35 m / 11 ft 0 in
Wing area: 29.15sq.m / 313.77 sq ft
Max. speed: 171 km/h / 106 mph
Cruise speed: 154 km/h / 96 mph
Ceiling: 3500 m / 11500 ft
Rate of climb: 145 m/min / 500 ft/min
Armament: 2 x 7.92mm