In the 1400's Leonardo invented the "idea" of a helicopter.
In 1906 Paul Cornu got a helicopter to hover 3 feet off the ground, but it would not go anywhere.
In the 1940's Igor Sikorsky invented a helicopter that would safely fly and hover.
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.
The first practical helicopter was invented about 1942