2:54pm PDT - June 9th, 2023
RT @ron_eisele: 10 June 1918. The Petroczy-Karman-Zurovec PKZ-2 Austro-Hungarian helicopter using counter-rotating rotors to cancel torque…
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巣田夏生 (@Natsuki_Suda)
2:54pm PDT - June 9th, 2023
巣田夏生 (@Natsuki_Suda)