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

Brandenburg L 15

  In late 1916, Flars issued technical specifications for a biplane powered by the new 345 hp Daimler engine. Brandenburg responded with the L 15 design, which Flars approved for construction in December 1916. In February 1917 work on the nearly-completed airframe was suspended because "neither the engine nor a mock-up was available" to determine proper installation parameters. Von Mises, who had been involved in drafting the Flars specification, approved aerodynamic and layout details in May 1917. When the L 15 appeared for its maiden flight in June 1917, it had a single-bay wing cellule and a compact, slab-sided fuselage. The L 15 proved to be extremely nose heavy in flight, which may have contributed to the accident that broke the fuselage while landing.
  The L 15 was extensively rebuilt in July 1917. The fuselage was reinforced and lengthened by 80 cm (31.5 in). The new wing was increased in span, substantially strengthened, and given a two-bay configuration. Work was completed on 8 August 1917. Flight trials now revealed an "unusually severe tail heaviness", a problem that was not resolved until early December 1917. After test flights by Flars pilot Stabsfeldwebel Franz Kuntner, the prototype was transferred to Aspern. Phonix, assuming fiscal responsibility, sold the L 15 to the LFT on 11 January 1918. No further records of flight tests have been found, although the L 15 was still at Aspern on 1 October 1918.

Brandenburg L 15 (Second Version)
Engine: 345 hp Daimler
Wing: Span Upper 13.80 m (45.28 ft)
Span Lower 13.80 m (45.28 ft)
Chord Upper 2.25 m (7.38 ft)
Chord Lower 2.25 m (7.38 ft)
Dihedral Upper 0 deg
Dihedral Lower 0 deg
Sweepback Upper 0 deg
Sweepback Lower 0 deg
Gap 1.86 m (6.10 ft)
Stagger 0.41 m (1.35 ft)
Total Wing Area 52.66 sq m (567 sq ft)
General: Empty Weight 1015 kg (2238 lb)
Loaded Weight 1500 kg (3308 lb)
Maximum Speed: 195 km/hr (121 mph)