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Updated: May 23, 2025
There were also two large propellers, one in front and the other at the rear. These were carefully made, of different layers of wood "built up" as they are called, to make them stronger. They were eight feet in diameter, and driven by a twenty-cylinder, air-cooled, motor, whirled around at the rate of fifteen hundred revolutions a minute.
Sharp pulled several levers, adjusted some valves, and then, with a rattle and bang, the huge, twenty-cylinder motor started. Waiting a moment to see that it was running smoothly, Mr. Sharp grasped the steering wheel. Then, with a quick motion he threw the two propellers in gear. They began to whirl around rapidly.
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