- last post: 01.01.0001 12:00 AM PDT
A barrel roll is a maneuver in which an object (usually an airplane or roller coaster) makes a complete rotation on its longitudinal axis while following a helical path, approximately maintaining its original direction. The G-force is kept positive (but not constant) on the object throughout the maneuver, commonly not more than 2-3 G, and no less than 0.5 G. Contrary to general belief, a barrel roll can not be achieved via the tapping of Z or R two times in a row.