Letters From Our Readers, August 30, 2021
Credit: Smithsonian National Air and Space Museum
COAXIAL COUSINS It is fitting that Ingenuity, the first interplanetary helicopter (April 19-May 2, p. 20), is of the same architecture as the first helicopter to fly on Earth 114 years ago, i.e. coaxial. Maurice Leger’s Grand Appareil climbed to 80 cm (2.6 ft.) on June 13, 1907, at the Castle of...
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