O.Thetford, P.Gray German Aircraft of the First World War (Putnam)
Built by Naglo Bootswerft of Spandau, Berlin, in 1918, this experimental single-seater was based on an Albatros D V type fuselage. The manner in which the bottom wing was attached to an extruded keel and braced with splayed struts, completely independent of the three main lifting surfaces, conveys the impression it was added as an afterthought. The machine was listed under serial D 1161/18 as Naglo D II for the second D types Competition at Adlershof in the summer of 1918, but no record of performance figures is available. Design was by Ing. Gradig, who was still with Albatros and, as a result, he was dismissed by that firm. The official type test was undertaken on 24th May 1918, but the machine was rejected at the request of Schubert of Albatros. Engine, 160 h.p. Mercedes D III. Span, 9.0 m. (29 ft. 6 3/8 in.). Area, 22.4 sq.m. (242 sq.ft.). Weights: Empty, 724 kg. (1,593 lb.). Loaded, 914 kg. (2,011 lb.).
W.Green, G.Swanborough The Complete Book of Fighters
NAGLO D II
The D II quadruplane built by the Naglo Werft of Pichelsdorf, near Berlin, was designed by Ing Gnadig, who was, at the time, still in the employ of the Albatros Werke. It participated in the second D-type contest at Adlershof in the summer of 1918, the debriefing minutes of which indicated that it was to appear for further testing after modification. Powered by a 160 hp Mercedes six-cylinder water-cooled engine and intended to carry an armament of two LMG 08/15 machine guns, the Naglo D II appears to have been based on an Albatros D V-type fuselage. The bottom wing, completely independent of the three main lifting surfaces, was attached to an extruded keel and braced with splayed struts. Official type testing was undertaken on 24 May 1918, and during the D-type contest evaluation pilots praised the excellence of the construction and workmanship of the D II while calling for an improvement in the flight characteristics. No details of the performance of this quadruplane fighter have survived.
Empty weight, 1,596 lb (724 kg).
Loaded weight, 2,015 lb (914 kg).
Span, 29 ft 6 1/3 in (9,00 m).
Wing area, 241.12 sq ft (22,40 m2).