Tags: Aircraft.

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.

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