Duralumin. The name for a wrought light alloy material extensively used for aircraft construction.
The fuselage is of semi-monocoque structure consisting of stiffeners and duralumin skin. The fuselage section is rectangular in the lower part and elliptical in the upper part. The fin is an integral part of fuselage.
It was one of the first all-metal planes, made of a new material, duralumin, which was almost as light as aluminum but twice as strong. It also was the first plane designed primarily to carry passengers rather than mail.
The character of the longitudinal duralumin girders and the way they are braced by the ring girders is clearly shown at Fig. 318. This depicts that portion of the hull where one set of fuel tanks are located. The view at Fig.
Every weight-saving method was used; the designers made extensive use of the new duralumin alloy (see below).
for a wrought aluminum-copper alloy created by Bausch Machine Tool Co, now fallen into generic use as any aluminum alloy containing 3.0-4.5% copper, 0.4-1.0% magnesium, and 0.1-0.7% manganese. Alcoa's version is commonly referred to as "Duraluminum, ...
 See also: Direct, Power, Aircraft, Lift, Navigation
  
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