Many people had a hand in inventing different helicopters. Igor Sikorski made the first successful one.
a group of people
Ken Kutaragi
A purple helicopter is a helicopter of the color purple. Really?
Everybody I know says A helicopter.
For the helicopter body to be in balance and direction to steer the helicopter.
A helicopter pilot flies a helicopter in the army.
Helicopter pilots do
In their helicopter.
There is no helicopter.
in a helicopter musem
it's a helicopter
No