to fly
Igor Sikorsky invented the first practical helicopter around 1940
No African American invented the helicopter. The first practical helicopter was invented by Igor Sikorski, a Russian American.
Igor Sikorski invented the first practical flying helicopter.
usa
Henrich Focke from Germany developed the first fully operational helicopter in the world: the FW 61 with its maiden flight in 1936.
The helicopter was first used as a troop transport.
Igor Sikorsky invented the first practical helicopter
The first practical helicopter was invented about 1942
That is Igor Sikorski, and he was in his 40 's when he invented the first practical helicopter.
Igor Sikorski, a Russian born American, invented the first practical helicopter.
Sikorsky
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