Word: stainlessness
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Some good reasons for preferring stainless steel...
...Stainless steel construction is as light as aluminum, because, though the steel is nearly three times as heavy, it is also a good deal stronger, so less metal—perhaps only one-third or one-fourth as much—need be used...
...Stainless steel can be fabricated faster and cheaper because, unlike aluminum, it can easily be spot-welded. A thousand steel spot welds cost less than 10?. A like number of aluminum rivets may cost $30.* And Union Carbide & Carbon's engineers estimated last week that stainless-steel wings can sometimes be built four times as fast as aluminum wings...
...Stainless steel is more durable, stands up four times better than aluminum under the incessant vibrations and strains which can "fatigue" a plane's metal structure to the breaking point. Result : longtime maintenance of steel planes is easier. Hitherto this factor has not been important, but engineers think that after the war air transports will be built (like railroad cars) to stand the strain of at least ten years of heavy duty...
...unlikely that stainless-steel planes will supersede aluminum planes during this war. But if Budd's all-steel transports are a wartime success, the whole peacetime future of aviation may be changed...