WNF Wn 11
| Wiener Neustädter Wn 11 | |
|---|---|
| Type: | Amphibious aircraft |
| Design country: | |
| Manufacturer: | |
| Commissioning: |
1935 |
| Production time: |
1935 to probably 1940 |
The WNF Wn 11 was a light amphibious aircraft produced by the Wiener Neustädter Flugzeugwerke .
construction
The Wn 11 was a land / sea aircraft in the shape of a flying boat with two engines mounted on the wings on tripods and side support floats . The two main wheels of the landing gear were spread apart from the fuselage. They were drawn to the fuselage when the aircraft was used on land and could then be used as landing gear.
The aircraft was designed as a cantilevered shoulder-wing wing with braced normal tail unit in a composite construction. The wing and tail unit were built as wooden or tubular steel frames with plywood planking and an impregnated fabric cover. The hull and support float were made of wood. The bottom of the hull was keeled flat, with two flat steps. The main wheels with their landing gear were hydraulically displaceable from the fuselage to the side and upwards in order to keep the wheels out of the water during take-off and landing when the aircraft is in water. The engines had two-bladed wooden pitch propellers. The fuel supply was 210 kg to 280 kg, housed in the center wing. The machine was equipped with double controls, on-board starter, headlights and blind flight instrumentation. Entry into the aircraft was through the cabin roof.
history
The Wn 11 was developed in 1934/35 by Flugzeugbau Hopfner as the HV 11. The machine was manufactured from 1935 by the aircraft construction department of the Hirtenberg cartridge factory in Wiener Neustadt under the name Hirtenberg HA 11. The aircraft could carry three passengers in addition to the pilot. The machine was driven by two seven-cylinder Sh 14 A-4 radial engines, each with 160 hp.
The military version of the amphibious aircraft was named Hirtenberg HAM 11. In the military version, the machine had a movable machine gun in the nose of the fuselage and one on the back of the fuselage and could carry two 25 kg bombs under the wings. The military version also had more powerful engines than the HA 11, two nine-cylinder Walter “Bora” RC radial engines, each with an output of 270 hp.
After Austria was annexed to the German Reich in March 1938, Wiener-Neustädter-Flugzeugwerke GmbH, formed by the merger of several companies, took over the production of the civil amphibious aircraft under the name WNF Wn 11. The German Air Force used the aircraft type as a touring aircraft for staff officers, for liaison - and light transport tasks, for maritime surveillance on inland and coastal waters as well as for sea pilot training.
In 1939 a reinforced version with two 240 HP Hirth HM 508 D (eight-cylinder V-engines) was commissioned.
Technical specifications
| Parameter | Data of the HAM 11 |
|---|---|
| length | 10.45 m |
| span | 14.10 m |
| height | 3.15 m |
| Wing area | 30.40 m² |
| Empty mass | 1,300 kg |
| normal takeoff mass | 2,250 kg |
| maximum take-off mass | 2,500 kg |
| crew | 3 |
| Engines | 2 nine-cylinder radial engines Walter "Bora" RC |
| power | 2 × 270 hp |
| Top speed | 230 km / h at a height of 100 m |
| Cruising speed | 186 km / h at a height of 100 m |
| Rate of climb | 250 m / min |
| maximum range | 900 km |
| maximum flight time | 5.2 h at 175 km / h |
| Summit height | 4,500 m |
source
- Ulrich Israel: Flying Boats of the Second World War . Deutscher Militärverlag, Berlin (East) 1972, pp. 110–111