The E4, a 200-horsepower airplane engine, built by the Wright Aeronautical Corporation, ran continuously for 573 hours at full power when tested by the Navy Departmenta world's record for engine endurance. This is equivalent to 60,000 miles in a Navy seaplane flying at usual cruising speed (or two and a half times round the world at the equator). Measured against the average record of 6,500 miles per annum of a high grade automobile, it represents nine years' unbroken service at 100 miles per hour. During the war engines scarcely ran 100 hours...
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