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The Hirtenberg HS.9 was an Austrian
two-seat touring or training aircraft of the late 1920s and early
1930s. A derivative of the Hopfner HS-5/28 via the Hopfner HS-8/29,
it was a parasol wing monoplane with a fixed tailskid landing
gear and room for two occupants in tandem open cockpits, and
first flew as the Hopfner HS-9/32 in 1932, powered by a de Havilland
Gipsy I engine. Production versions had Siemens Sh 14 engines
with NACA cowlings. A single example of a refined version with
an uncowled 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 aircraft
under the Hirtenberg brand. |
