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Hopfner HV.1234 / HV.12/34
The Hopfner HV.12 / 34 (HV.1234) light transport aircraft was designed by Lampich by special order of Anton von Habsburg, Prince Lorraine. The aircraft became the first twin-engine transport aircraft of Flugzeugbau Hopfner GmbH
The HV.1234 featured six-seat., with enclosed cockpits and fixed undercarriage. The spacious fuselage was a steel tube construction, which was covered with fabric in the front and back center area with plywood at the stern. The passenger cabin space offered seats for five passengers and was luxuriously equipped. The two spar wings and tail were wooden structures, which were covered with plywood and fabric. The rudder were fabric covered. The flanding gear was fixed to the wing spars, and went through the engine cowling and had two oil dampers. Against the bottom of the fuselage, it was connected, each with a V-strut
The first flight of the prototype aircraft, registered A-150 werk.Nr 28, took place in August 1935at Aspern. The flight characteristics were assessed as good and the HV.12/34 flew irregularly as a private aircraft, but also as a light transport aircraft
The following year, the aircraft received the registration number OE-DEA. After the annexation of Austria in 1938, the registration number was changed to D-OEEA. Later it came to the Airborne Division of Hirtenberger Cartridge Factory AG. When war broke out, it should be used as a liaison aircraft for the Luftwaffe, but there were problems with the supply of spare parts for the engines and the HV.12/34 was taken out of service. The fate is unknown
Only the one was built
Engine: 2 x de Havilland Gipsy Major, 130 hp
Prop dia: 2.00 m
Prop disc: 3.14 sq.m
Wing span: 14.10 m
Wing area: 30.00 sq.m
Aspect ratio: 6.63
Dihedral: 1 deg
Length: 10. 40 m
Height: 2.70 m
Empty weight: 1100 kg
Normal take-off weight: 2000 kg
Max take off weight: 2160 kg
Fuel capacity: 210 lt
Maximum speed: 205 km / h
Maximum speed at SL: 186 km/h
Cruising speed: 175 km / h
Range: 950 km
Servce ceiling: 4800 m
Climb to 1000 m: 6.25 min
Climb to 3000 m: 25 min
Rate of climb: 2.8 m/sec. 
Endurance: 6 hr
Crew: 1
Passengers: 5

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