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Hirtenberg HV.15
WNF Wn 15
In 1935, the management of the Austrian company Hirtenberger Patronen, Zundhutchen und Metallwarenfabrik AG decided to expand the production of aircraft of its own design and bought the aircraft company Flugzeugbau Hopfner GmbH. The first aircraft, accepted for serial production, was a small twin-engine monoplane, designed for the carriage of passengers or the transport of small loads. The design of the new Hopfner / Hirtenberg HV.15 machine was based on the elements of the previous Hopfner HR.14 / 34 aircraft, developed by the engineer Lumpich in 1934 at Flugzeugbau Hopfner GmbH.
It was a low-wing with a glazed, six-seat, cabin and retractable landing gear. The wing had a wooden structure, and the fuselage was steel tube, fabric covered.
The prototype HV-15 (OE-POH) made its first flight on March 8, 1936. The aircraft was equipped with Austrian-produced Siemens Sh-14a motors (160 hp / 119 kW). Serial production were supposed to get English de Havilland "Gipsy Six" II (204 hp).
Austrian designers planned the release of the military version of NM.15, equipped with French engines of Renault "Bengali Six", radio navigation equipment and defensive weapons, consisting of 2-3 moving machine guns placed in the fuselage. Suspension of small bombs with a total mass of up to 300 kg was envisaged. The main purpose of NM.15 was the training of pilots and navigators (including for night flights), and also considered the option of using it as a light bomber.
Serial production of HV.15 and NM.15 aircraft did not take place. After the annexation of Austria, its aviation industry underwent a reorganization, and the merger of Hirtenberg became part of the new Wiener-Neustadter Flugzeugwerke GmbH (abbreviated to WNF).
According to the new notation system, HV.15 was renamed to WN-15 (sometimes called WNF 15) and assigned the German registration D-OPQH. The prototype was then transferred to the use of the Austrian police. After flying about three years in Austria, the Wn.15 aircraft was given in 1942/1943 to the German administration of the Croatian Air Force and used some time for transport purposes, bearing a new tactical number 2101. Nothing is known about the future fate of Wn.15.
Engines: 2 × Siemens-Halske Sh 14A, 120 kW (160 hp) each
Wingspan: 15 m (49 ft 3 in)
Wing area: 33 m2 (360 sq ft)
Length: 10.65 m (34 ft 11 in)
Height: 2.9 m (9 ft 6 in)
Empty weight: 1,550 kg (3,417 lb)
Gross weight: 2,200 kg (4,850 lb)
Maximum speed: 235 km/h (146 mph; 127 kn)
Cruise speed: 198 km/h (123 mph; 107 kn)
Range: 900 km (559 mi; 486 nmi)
Service ceiling: 5,200 m (17,100 ft)
Crew: 2
Capacity: 4 passengers

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