Word: shrapnel
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Dates: during 1920-1929
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...superseding wood in the construction of aircraft. Each wing, instead of having two main strength members known as " spars," has a number of such spars which divide up the load between them. Since one or more of these spars can be pierced without the entire wing failing, invulnerability to shrapnel fire is secured. Another valuable feature is the wing cooling or radiation system. Instead of the ordinary automobile type of radiator, which increases the air resistance, the cooling water is pumped through small grooves in the sheet metal covering of the wings. The air rushing over the wing surface cools...