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.
A helicopter pilot flies a helicopter in the army.
For the helicopter body to be in balance and direction to steer the helicopter.
There is no helicopter.
In their helicopter.
Helicopter pilots do
No
with helicopter mod
in a helicopter musem