Focke-Wulf F 19
The Focke- Wulf F 19 " duck " was an experimental aircraft from the German manufacturer Focke -Wulf from the second half of the 1920s. The F 19 should serve as a test vehicle for the canard design, which should be used in a newly developed transport aircraft.
History
Already since 1908 Heinrich Focke had worked together with his brother Wilhelm modelaircraft in duck design and also get a patent in this area. In the Rumpler -Werke in 1909 a full- scale contemporary, equipped with a 40 -horsepower engine aircraft was subsequently built. However, could be carried out on a field near Berlin with the project financier and lawyer Alberti at the wheel so that only a few short flights.
In 1925, attacked the German Experimental Institute for Aviation ( DVL ) Fockes developments back on and placed the order for the construction of a canard aircraft with the practical utility of this design should be demonstrated. For the project also studies the wind tunnel, built in 1908 at the Research Institute in Göttingen model could be used.
The first machine was completed in 1927 and first flew on 2 September of the same year. There were 14 successful test flights will be carried out before the machine crashed on September 29, 1927 with Georg Wulf was killed.
The second machine built with the aircraft registration mark D- 1960 was designated as F 19a and flew in late 1930 for the first time. On a promotional tour, she was presented the following year in some European countries. An allied air raid destroyed in 1944 on display in the German Aviation Collection Berlin D - 1960.
Construction
The decisive factor for the choice of Canardbauweise was next to the rollover safety during landing, even at full brake application, especially the stall safety of these structural design. Another aspect was the higher protection of passengers in an accident because they were housed on the top plane further away than in a conventional transport aircraft.
The fuselage structure was constructed from fabric -covered welded steel tubes. The wings were made in wood construction covered with fabric. The spaced well apart to the rear wing had with its front edge only a distance of 3.60 m from the rear end. The front wing had an almost triangular plan, the base of the triangle pointed forward. In the first machine ( F 19) was this wing like a seesaw be moved from the cockpit up or down to compensate for the asymmetric thrust with a possible engine failure better. This construction was viewed as the cause of the accident to the first machine and correspondingly changed in the F 19a by the front wing with cable is firmly clamped.
Due to the short lever arm to control about the vertical axis, the rudder had to be designed exceptionally large. In addition, two more right rudder surfaces were still under the main wing and the left provided.
The two engines had a tractor propeller, which should be in a later production version replaced by a pusher propeller. The control surfaces of the machine should remain so without being affected by the turbulence of the propeller jet. The fuel tanks were in the wing leading edge, placed left and right of the fuselage.
The cabin for three passengers started right at the front edge of the main wings. Access was via a door on the right side. The pilot sat in an open cockpit.