Hirtenberg HS.9

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.

Variants

• 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

Operators

 Austria

• Austrian Air Force (1927-1938)

Specifications (HS.9A)

Data from A.J.Jackson, British Civil Aircraft since 1919 Volume 3, Putnam & Company, London, 1974, ISBN 978-0-370-10014-2, Page 369

General characteristics

• Crew: 2
• 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)
• Powerplant: 1 × de Havilland Gipsy Major, 90 kW (120 hp)

Performance

• Maximum speed: 190 km/h (118 mph)

References

• The Illustrated Encyclopedia of Aircraft (Part Work 1982-1985), 1985, Orbis Publishing, Page 2173
• A.J.Jackson, British Civil Aircraft since 1919 Volume 3, Putnam & Company, London, 1974, ISBN 978-0-370-10014-2, Page 369