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How Were Modern Helicopters Invented?

The idea of the helicopter dates back to the Renaissance—but the contraptions could not be built until the development of modern aerospace engineering during the interwar period.
Although often dismissed as ‘followers’ by many both in the lead-up to and during the Second World War, the huge Japanese ...
A homebuilt plane modeled after the 1933 Henderson Longster and finished by the Brainerd EAA chapter went up in the front ...