The first practical helicopter was invented in the 1930's. Following this, like all machines, it evolved bit by bit to become what it is today. - Very few machines were "invented" as such, almost all came from different designers adding improved parts.
The helicopter is still in 'evolution' and improvements to it's rotor head, transmission and blades are underway as I write.
I am wondering where was helicopter invented?
Nobody invented the helicopter in 1918
An engineer, Igor Sikorski, invented the helicopter.
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 Sikorsky invented the helicopter.
no
Igor Sikorski invented the first practical flying helicopter.
J. T awston invented the helicopter (black male)
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.
Igor Sikorski perfected helicopter hovering