P.Grosz, G.Haddow, P.Shiemer Austro-Hungarian Army Aircraft of World War One (Flying Machines)

Aviatik 30.26 and 30.28

  On 25 June 1917, Aviatik received a contract to build two long-range reconnaissance prototypes (Fernaufklarungs-Flugzeug) to which the numbers 30.26 and 30.28 were assigned. The 30.26, powered by a 230 hp Hiero engine, arrived at Aspern on 8 March 1918 for flight trials. Its impressive climb rate caused Uzelac to urge the "completion of flight testing with utmost dispatch." The 30.26 was slightly damaged in a forced landing on 11 April 1918. The absolute ceiling of 4750 meters (15,584 ft) reached on 14 April did not meet expectations, although the prototype was accepted by Flars later that month. There are indications that the wingspan was increased and the empty weight reduced to raise the ceiling, but to no avail. On 15 June 1918, Flars reported that since the type lacked the required performance it would not go into production.
  After the war Berg told Riccardo Cavigioli, a member of the Inter-Allied Armistice Commission, that the 30.26 (as the Aviatik C.II) was destined for the Italian Front had production not been stopped by the Armistice. The statement is not supported by LFT evidence. An Aviatik C.II was not included in the August 1918 production program. Rather, Aviatik was scheduled to build the G.III series 131 bomber and the Fokker D.VII fighter through mid-1919.
  The Aviatik 30.28 prototype, designed to take a 345 hp Daimler V-12 engine, was not completed. Further details are lacking.

Aviatik 30.26 Specifications
Engine: 230 hp Hiero
Wing: Span Upper 10.56 m (34.65 ft)
Total Wing Area 32.4 sq m (349 sq ft)
General: Length 7.40 m (24.28 ft)
Empty Weight 832 kg (1835 lb)
Loaded Weight 1282 kg (2827 lb)
Maximum Speed: 158 km/hr (98 mph)
Climb: 1000m (3,281 ft) in 3 min 53 sec
2000m (6,562 ft) in 8 min 34 sec
3000m (9,843 ft) in 15 min 2 sec
4000m (13,124 ft) in 25 min 28 sec
4700m (15,585 ft) in 40 min 48 sec

E.Hauke, W.Schroeder, B.Totschinger Die Flugzeuge der k.u.k. Luftfahrtruppe und Seeflieger 1914-1918

30. Flugzeuge der Österreichischen Aviatik-Werke Wien, Stadlau
30.26 Berg C Prototyp für C.II H 245
30.28 Berg DD C-Type Dm 300