Word: leakproof
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Dates: during 1940-1949
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...Wood Jr., son of famed Speed-boater Gar Wood, had plans for a one-piece, leakproof fiberglass boat. But he does not expect to get into production till spring...
...firepower and protection of U.S. fighting aircraft (guns, armor and leakproof fuel tanks) are equal in all cases to the best our Allies and the enemy have in the air, and in some cases are decidedly superior. In these necessities, brought forth by the war, U.S. aircraft were deficient when the war began. It should be of great satisfaction to the American public that, when these deficiencies were remedied, the job was done with armor and with guns previously developed...
Curtiss P-40-single-engine, liquid-cooled. Most discussed of all U.S. combat aircraft, this fighter has the virtues of heavy hitting power, excellent armor, high diving speed, and the leakproof tanks common to all U.S. combat aircraft. Against the Zero it has proved, on the average, to be superior. But most P-40 pilots frankly say that they would like more altitude, if they could still maintain their advantages of superior firepower and protection...