Question

$\huge\mathfrak\orange{Question ⤵}$

Why should a helicopter necessarily have two propellers ??​

Answer 1

Answer:

A helicopter must necessarily have two propellers. Reason :

1) Two propellers are provided in helicopter in order to conserve linear momentum.

Explanation:

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Answer 2

Answer:

By “two propellers” I assume you mean “two sets of propeller blades”. Yaw, is the rotation, or turning from side to side. According to Newton: for every reaction, there is an equal and opposite reaction. If the blades are turning counterclockwise (looking down), it will cause the helicopter to yaw to starboard (right or clockwise) unless a counter-rotational force is applied to the helicopter. This can be accomplished by a second set of propeller blades or rocket. This can be done with two sets of rotor (propeller) blades on the same mast turning in opposite directions, two sets of rotor blades front and back (like a Chinook helicopter), or by a small tail rotor that moves the air from side-to-side as a counter forc

Explanation:

Helicopters need at least two blades at 180 degree, to have proper balancing and enough lift.

adding more than two number of propellers (blades) will definitely give more lift and is being used on some heavy helicopters , but having more propellers have bad effects also. For example, the trailing air by one propeller becomes the leading air for the following propeller and it may not be smooth enough to obtain maximum efficiency from Trailing propeller.

Still, at the cost of some efficiency,more than two number of propellers are being used for very heavy helicopters.

The design and the science of propellers, is too complex but in a lay man’s language I hope, it can be explained this way.

I hope it may help

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