united states
germany
usa
i think it was japan at the end of WWII
Igor Sikorsky invented the first practical helicopter.
Nobody invented the helicopter in 1909
Russia
germany
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.
France developed the first model of the helicopter. It was first invented by Paul Cornu, a french inventor. Some say the invention of the helicopter was inspired by Leonardo Da Vinci's flying machine.
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.