It's a sexual position. This Q shouldn't be in this category.
The helicopter is a sexual position wherein the receiving party remains perfectly still while the giving party spins around in a complete circle, while remaining inserted.
It can takeoff or land in where ever the position it was.... it don't need a runway...
That's when you use a helicopter instead of a ski lift to get to the start position of the skiing.
The position would be roughly the same.
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.
There is no helicopter.
In their helicopter.
Helicopter pilots do
Peter A. Villalta has written: 'Laser light sensor circuit design for position and attitude estimation of an autonomous flying helicopter'