Which statement is correct concerning the torque effect on helicopters?

The statement concerning the torque effect on helicopters that is correct is that torque direction is the opposite of rotor blade rotation. This is an important concept in helicopter flight mechanics. As the main rotor blades turn in one direction, they create a reactionary force that attempts to rotate the helicopter's fuselage in the opposite direction due to Newton's third law of motion. This reaction is what pilots must manage, typically by using the tail rotor, which applies a counteracting force to maintain directional control and stability.

Understanding this principle is crucial for helicopter operations, as it provides insight into how torque influences handling characteristics. If not properly compensated for, torque can lead to difficulty in controlling the aircraft and unwanted yawing motions. Therefore, recognizing that torque takes effect opposite to the rotation of the rotor blades is vital for both pilots and those involved in the design and maintenance of helicopters.