Why does a helicopter have two propellers?
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because we get the pressure of air and then this pressure helps it to fly
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Simple answer.
To counter the rotating force exerted by one rotating blade .
Game of thrones answer.
Day to day physics would tell if you hang something from a rotating blade like the blades of helicopter, the hanging body will automatically start revolving opposite to the direction of the rotating blade. It simple physics. So to counter that, you need one more rotor.
Now , the alignment of this rotor can be an important decision. You can either place a smaller rotor ,perpendicular to the original rotor, which would stop the motion of the body below the main rotating blade . This configuration is used in almost all helicopters.
Another way to do that is place another rotor of same size and dimension and move it opposite to the direction of the original rotor. Thus, the rotation effects that is being applied on the body gets neutralized by these 2 opposing rotors. This configuration is used in CHINOOK helicopters.
To counter the rotating force exerted by one rotating blade .
Game of thrones answer.
Day to day physics would tell if you hang something from a rotating blade like the blades of helicopter, the hanging body will automatically start revolving opposite to the direction of the rotating blade. It simple physics. So to counter that, you need one more rotor.
Now , the alignment of this rotor can be an important decision. You can either place a smaller rotor ,perpendicular to the original rotor, which would stop the motion of the body below the main rotating blade . This configuration is used in almost all helicopters.
Another way to do that is place another rotor of same size and dimension and move it opposite to the direction of the original rotor. Thus, the rotation effects that is being applied on the body gets neutralized by these 2 opposing rotors. This configuration is used in CHINOOK helicopters.
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