Development
In response to a specification for a new fighter promulgated by the l'Air Ministry on 15 June 1936, the design of the D.520 started in September 1936, at the private design firm led by Émile Dewoitine. The specifications called for a maximum speed of 500 km/h (310 mph) at 4,000 m (13,000 ft), the ability to climb to 8,000 m (26,000 ft) in less than fifteen minutes, with take-off and landing runs not exceeding 400 m (1,300 ft). The armament was to be two 7.5 mm (.295 in) machine guns and one 20 mm Hispano-Suiza HS.9 cannon, or two HS.9 cannon. Dewoitine had been disappointed with the performance of his last design, the Dewoitine D.513, which was rejected by the Armée de l'Air in favour of the Morane-Saulnier M.S.406, and decided to respond to the specifications with a design using the latest construction techniques and the most powerful available engine, the new 660 kW (890 hp) Hispano-Suiza 12Y-21 liquid-cooled engine. The first design was rejected by the l'Air Ministry, which, after being impressed by the British Hawker Hurricane and Supermarine Spitfire, then uprated the specifications to include a maximum speed requirement of 500 km/h (310 mph). In response, Dewoitine renamed the further development, the "D.520".
Read more about this topic: Dewoitine D.520
Famous quotes containing the word development:
“The proper aim of education is to promote significant learning. Significant learning entails development. Development means successively asking broader and deeper questions of the relationship between oneself and the world. This is as true for first graders as graduate students, for fledging artists as graying accountants.”
—Laurent A. Daloz (20th century)
“The man, or the boy, in his development is psychologically deterred from incorporating serving characteristics by an easily observable fact: there are already people around who are clearly meant to serve and they are girls and women. To perform the activities these people are doing is to risk being, and being thought of, and thinking of oneself, as a woman. This has been made a terrifying prospect and has been made to constitute a major threat to masculine identity.”
—Jean Baker Miller (20th century)
“This was the Eastham famous of late years for its camp- meetings, held in a grove near by, to which thousands flock from all parts of the Bay. We conjectured that the reason for the perhaps unusual, if not unhealthful development of the religious sentiment here, was the fact that a large portion of the population are women whose husbands and sons are either abroad on the sea, or else drowned, and there is nobody but they and the ministers left behind.”
—Henry David Thoreau (1817–1862)