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Wikipedia definition
1. Barrel rollA barrel roll is an aerial maneuver in which an airplane makes a complete rotation on its longitudinal axis while following a helical path, approximately maintaining its original direction. It is sometimes described as "a combination of a loop and a roll". The G-force is kept positive (but not constant) on the object throughout the maneuver, commonly between 2-3 G, and no less than 0.5 G.
Read “Barrel roll” on English Wikipedia
Read “バレルロール (マニューバ)” on Japanese Wikipedia
Read “Barrel roll” on DBpedia

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