Plain English Meaning

On most single-engine prop planes, the airplane naturally wants to turn or roll to the left when you apply lots of power at slow speeds, like during takeoff. Four physical forces cause this, and the pilot counters them mainly with right rudder.

Full Definition

The combined aerodynamic and mechanical forces that cause a single-engine, propeller-driven airplane to yaw or roll to the left, particularly during high-power, low-airspeed, high-angle-of-attack conditions such as takeoff and climb. The four contributing forces are torque reaction (the airframe reacting against engine rotation), ( striking the left side of the ), (the producing more than the at high ), and (a applied to a acting 90 degrees ahead in the ).