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:
“As a final instance of the force of limitations in the development of concentration, I must mention that beautiful creature, Helen Keller, whom I have known for these many years. I am filled with wonder of her knowledge, acquired because shut out from all distraction. If I could have been deaf, dumb, and blind I also might have arrived at something.”
—Mark Twain [Samuel Langhorne Clemens] (1835–1910)
“Every new development for the last three centuries has brought men closer to a state of affairs in which absolutely nothing would be recognized in the whole world as possessing a claim to obedience except the authority of the State. The majority of people in Europe obey nothing else.”
—Simone Weil (1909–1943)
“They [women] can use their abilities to support each other, even as they develop more effective and appropriate ways of dealing with power.... Women do not need to diminish other women ... [they] need the power to advance their own development, but they do not “need” the power to limit the development of others.”
—Jean Baker Miller (20th century)