Descent Longitudinal Axis Torque 
Pilot Institute
FEBRUARY 20, 2025
Roll or bank is the aircrafts movement about its longitudinal axis. Since theyre located on opposing sides of the longitudinal axis, both ailerons need to move in the opposite directions to complement each others motion. This movement turns the aircraft about the longitudinal axis, making it enter a bank.
Pilot Institute
APRIL 12, 2025
The complication with helicopters is that the main rotor is driven by an engine that applies a twisting force (torque) to spin it. This is called torque reaction, and if its left unchecked, the helicopter fuselage will spin in the opposite direction of the main rotor. These rotors create equal and opposite torques that cancel out.
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