The Hopfner HV-4/28 was a small airliner built in Austria in the late 1920s. An enlarged version of the HV-3/27, it was a conventional, high-wing cantilever monoplane with a fully enclosed cabin. A single example was built in 1928 and saw heavy use by the airline that year. In 1929, it received a major refurbishment that included a change or powerplant from the original Heiro to a Gnome et Rhône 9A Jupiter engine and was sold to a private owner under the new designation HV-8/29GR. This aircraft was still flying at the time of the Anschluß, after which it received a new German registration.

HV-4/28
Role Airliner
National origin Austria
Manufacturer Hopfner
Designer Theodor Hopfner
First flight 25 July 1929
Primary user Rundflugunternehmen Theodor Hopfner
Number built 1

Specifications (HV-4/28)

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General characteristics

  • Crew: One pilot
  • Capacity: 4 passengers
  • Length: 11.00 m (36 ft 1 in)
  • Wingspan: 16.20 m (53 ft 2 in)
  • Height: 3.30 m (10 ft 10 in)
  • Wing area: 42.0 m2 (452 sq ft)
  • Empty weight: 1,390 kg (3,060 lb)
  • Gross weight: 1,970 kg (4,340 lb)
  • Powerplant: 1 × Hiero 6 , 170 kW (230 hp)

Performance

  • Maximum speed: 125 km/h (78 mph, 68 kn)
  • Cruise speed: 108 km/h (67 mph, 58 kn)
  • Endurance: 6 hours 30 minutes

References

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  • The Illustrated Encyclopedia of Aircraft. London: Aerospace Publishing. p. 2174.
  • Taylor, Michael J. H. (1989). Jane's Encyclopedia of Aviation. London: Studio Editions. p. 510.
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