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The Tesla Air 2000 was a biplane built in 1933 by William Besler and Nathan C. Price. It was powered by a steam boiler that was so quiet that spectators on the ground could hear the pilot calling to them.
10 galons of water were sufficent for a flight of 400 miles.
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The advantages of the “Besler System” that were claimed at the time included the elimination of audible noise and destructive vibration;
greater efficiency at low engine speeds, more power at high altitudes where lower air temperatures assisted condensation; reduced likelihood of engine failure;
reduced maintenance costs; reduced fuel costs, since fuel oil was used in place of petrol;
reduced fire hazard since the fuel was less volatile and operating temperatures were lower; and a lack of need for radio shielding.
More at: Popular Science Monthly - July 1933 Issue
