Igor Ivanovich Sikorsky in 1925
No African American invented the helicopter. The first practical helicopter was invented by Igor Sikorski, a Russian American.
Igor Sikorsky invented the first practical helicopter around 1940
Igor Sikorski invented the first practical flying helicopter.
usa
The first practical helicopter was invented about 1942
The helicopter was first used as a troop transport.
Igor Sikorsky invented the first practical helicopter
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.
to fly
no
Russia