O.Thetford, P.Gray German Aircraft of the First World War (Putnam)
Rumpler 6A 2
This experimental two-seater of August 1916 was intended as a two-seat fighter. Early in 1917 normal struts were substituted for the original X struts and strengthened wings fitted. At a later date the machine was fitted with a geared 8 cylinder Mercedes. However, excessive vibration problems arose and the experiment was abandoned. Engine, 160 h.p. Mercedes D III. Span, 10.20 m. (33 fl. 4 5/8 in.). Loaded weight, 1,260 kg. (2,772 lb.).
J.Herris Rumpler Aircraft of WWI (A Centennial Perspective on Great War Airplanes 11)
The single-bay 6A2 was designed as a two-seat fighter. Powered by a 160 hp Mercedes D.III, its first test flight in January 1916 revealed problematic handling qualities, but extensive experimentation and modification finally gave the 6A2 'excellent flight characteristics' according to Friedrich Budig. Unfortunately, climb rate was less than the C.I reconnaissance airplane and the wings were too 'elastic', so the X-struts were replaced with parallel struts. The 220 hp Mercedes D.IV straight-eight engine was also tried and gave very good climb rate but vibration was excessive. Records are ambiguous about whether the 160 hp Mercedes D.III was re-installed. Both flight testing and calculations indicated the 6A2 would not meet its requirements, and it was abandoned in favor of the enlarged, two-bay 6A5 prototype that became the C.III of otherwise similar appearance. The intermediate 6A3 and 6A4 were designed but probably not built.
Rumpler 6A2 Specifications
Engine: 160 hp Mercedes D.III
Wing: Span 10.20 m
Area 36.00 m2
General: Empty Weight 780 kg
Loaded Weight 1260 kg
Climb: 1000m 6.0 min
2000m 16.5 min
3000m 30.7 min
4000m 69.0 min
W.Green, G.Swanborough The Complete Book of Fighters
RUMPLER 6A 2 Germany
In May 1916, the Rumpler Flugzeug-Werke initiated flight test of a tandem two-seat reconnaissance fighter referred to by the company designation 6A 2 (the first digit indicating the year, the letter indicating the aircraft category and the second digit signifying the design sequence in that category and year). Whereas all preceding Rumpler biplanes had featured two-bay wing cellules, the 6A 2 broke new ground in being of single-bay configuration with Y-type interplane struts. Of mixed construction with plywood and fabric skinning, it was initially powered by a 160 hp Mercedes D III six-cylinder water-cooled engine with Stimkuhler radiator beneath the wing centre section and a ‘‘rhino horn” exhaust pipe. Proposed armament comprised a synchronised 7,9-mm LMG 08/15 machine gun and a swivelling Parabellum in the rear cockpit. At an early phase in flight development some strengthening of the wings was undertaken and more orthodox paired struts substituted, and, subsequently, the 6A 2 was fitted with a geared eight-cylinder Mercedes D IV engine of 220 hp. Excessive vibration led to discontinuation of the flight test programme, the type being overtaken by the more innovative 7C 1.
Loaded weight, 2,778 lb (1260 kg).
Span, 33 ft 5 1/2 in (10,20 m).