Saab 21 - Design and Development

Design and Development

Sweden wished to ensure its continued neutrality through a policy of armed strength during World War II but were effectively denied access to foreign weapons. The original design studies began in 1939, based around the use of a "buried" Bristol Taurus engine. The project remained dormant until 1941. In response to the need for air defence, and faced with the prospect of imported designs being unavailable due to the war, Sweden undertook an indigenous rearmament programme including an advanced fighter. The low-wing monoplane Saab 21 fighter was ultimately designed around a license-produced version of the Daimler-Benz DB 605B engine, featured innovations such as tricycle landing gear, heavy forward-firing armament, ejector seat, and a twin-boom pusher layout that later allowed the type to be modified with a turbojet engine.

The advantages of a pusher design, are that the view forward is unobstructed and armament can be concentrated in the nose, while a major drawback is difficulty in escaping from the aircraft in an emergency, as the pilot could get drawn into the propeller blades. SAAB deliberated between systems that would eject the pilot, or jettison the propeller or the engine, (via a system of explosive bolts) . and eventually installed an early ejector seat developed by Bofors for the purpose and tested in 1943.

In 1947, the aircraft was extensively redesigned with over 50% airframe, tailplane and wing changes and fitted with a de Havilland Goblin turbojet, acquiring the new designation Saab J 21R.

Read more about this topic:  Saab 21

Famous quotes containing the words design and/or development:

    What but design of darkness to appall?—
    If design govern in a thing so small.
    Robert Frost (1874–1963)

    Somehow we have been taught to believe that the experiences of girls and women are not important in the study and understanding of human behavior. If we know men, then we know all of humankind. These prevalent cultural attitudes totally deny the uniqueness of the female experience, limiting the development of girls and women and depriving a needy world of the gifts, talents, and resources our daughters have to offer.
    Jeanne Elium (20th century)