It was discovered because inventors who had built aircraft could see the need for it.
Nobody, they built it
The first operational helicopter was built in 1936, the Focke-Wulf Fw 61.
No, experts have discovered that the picture is a hoax.
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.
Helicopter pilots do
In their helicopter.
The Chinook helicopter is an American twin-engine helicopter. The helicopter is used by military forces. The Chinook helicopter is mainly used for troop transportation, artillery movement, and resupply on the battlefield.
There are different helicopter games, but the gist of all of them is to fly a helicopter and not to crash. Some of the games have obstacles that the helicopter has to be flown around.