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Hopfner HV.428 / HV.4/28 / HV-8/29GR
In 1928, Theodor Hopfner began designing a new light passenger aircraft, designated Hopfner HV.4 / 28. The aircraft retained the power plant from its predecessors - one Hiero engine with a power of 230 hp. The passenger capacity of the aircraft also did not change - one passenger was located near the pilot, and three more were in the cabin.
The first flight of the aircraft (board number A-49) took place on July 25, 1929. The Hopfner HV-4/28 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.
Hopfner HV-4/28
Engine: 1 × Hiero 6, 170 kW (230 hp)
Wingspan: 16.20 m (53 ft 2 in)
Wing area: 42.0 sq.m (452 sq.ft)
Length: 11.00 m (36 ft 1 in)
Height: 3.30 m (10 ft 10 in
Empty weight: 1,390 kg (3,060 lb)
Gross weight: 1,970 kg (4,340 lb)
Maximum speed: 125 km/h (78 mph)
Cruising speed: 108 km/h
Endurance: 6 hours 30 min
Crew: One pilot
Capacity: 4 passengers

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