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Hirtenberger HS-9
Hopfner HS-9
Hirtenburg HS-16



Hirtenberg HS.9A D-EDJH – 12 August 1939


A derivative of the Hopfner HS-5/28 via the Hopfner HS-8/29, the Hirtenberg HS.9 two-seat touring or training aircraft of the late 1920s and early 1930s was an Austrian parasol wing monoplane with a fixed tailskid landing gear and room for two occupants in tandem open cockpits.
Designed by Theodor Hopfner, it first flew as the Hopfner HS-9/32 in 1932, powered by a 120 hp de Havilland Gipsy Major I engine. Production versions had Siemens Sh 14 engines with NACA cowlings. A single example of a refined version with an uncowled 125 hp Siemens engine was flown in 1935 as the Hopfner HS-9/35, shortly before the Hopfner company went bankrupt.
When Hopfner's assets were purchased by Otto Eberhardt Patronenfabrik, production continued of both de Havilland- and Siemens-powered (designated HS-9A) aircraft under the Hirtenberg brand.
Hirtenburg HS.9A
About 40 were built in total. They were operated by the Austrian Air Force during 1927-1938.
HS-9/32 - Original version by Hopfner
HS-9/35 - developed version of HS-9/32
HS.9 - Production aircraft with a Siemens Sh 14a piston engine.
HS.9A - Production aircraft with a de Havilland Gipsy Major piston engine.
HS.16 - military trainer version of HS.9
Engine: 1 × de Havilland Gipsy Major, 90 kW (120 hp)
Length: 8.05 m (26 ft 5 in)
Wingspan: 10.972 m (36 ft 0 in)
Empty weight: 568.8 kg (1254 lb)
Gross weight: 948 kg (2090 lb)
Maximum speed: 190 km/h (118 mph)
Crew: 2






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