However, the high-performance aircraft designed since 1945 have made extensive use of skin structures machined from thick plate and extrusions, precluding the use of alclad exterior skins.
12.
Alclad is a heat-treated aluminum, copper, manganese, magnesium alloy that has the corrosion resistance of pure metal at the surface and the strength of the strong alloy underneath.
13.
The Knuckleduster's straight-sided hull was of all-metal ( Alclad ) box-section construction, from the bow as far as the pointed main step at the rear of the planing bottom; aft of the main step the fuselage was of monocoque construction.
14.
The wings had a flush-riveted Alclad covering and featured both Frise-type ailerons and the interally-developed Gouge flaps, the latter of which were actuated by an electric motor connected via a gearing system and screw jacks, allowing the flaps to be lowered in 60 seconds and elevated within 90 seconds.
15.
The fuselage was a monocoque structure, built on duralumin ovals and stringers, covered with stress bearing Alclad sheet . diameter 90 hp ( 67 kW ) Pobjoy Niagara came as a " power-egg " complete with all accessories and its own long chord cowling, plus Pobjoy's characteristic " smiley " front baffle.
16.
Although the basic wing plan was to stay the same for most production Spitfires, the prototype wing was structurally different : No weapons were fitted and the alclad skinning was laid out in spanwise strips; underneath the port wing the radiator bath started immediately behind the starboard undercarriage bay, with the opening conforming to the angle of the bay.
17.
Preliminary results of salt spray tests ( 24 weeks of exposure ) show changes in tensile strength and elongation of Alclad 17ST, when any occurred, to be so small as to be well within the limits of experimental error . " In applications involving aircraft construction, Alclad has proven to have increased resistance to corrosion at the expense of increased weight when compared to sheet aluminum.
18.
Preliminary results of salt spray tests ( 24 weeks of exposure ) show changes in tensile strength and elongation of Alclad 17ST, when any occurred, to be so small as to be well within the limits of experimental error . " In applications involving aircraft construction, Alclad has proven to have increased resistance to corrosion at the expense of increased weight when compared to sheet aluminum.
