Question

why helicopter are provided with 2 propelors​

Answer 1

One is to control the flight and other is to stay in the air

Answer 2

Answer:

So as the big giant fan spins in one direction, torque will cause the fuselage of the helicopter to spin in the opposite direction. Hence the small propeller at the rear. This is called the “anti-torque” rotor. It essentially pushes the tail of the helicopter against the torque of the main rotor

Explanation:

Select my answer as Bainlist.

Thanks!!!