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A '''barrel roll''' is an aerial maneuver in which an [[airplane]] makes a complete [[rotation]] on both its longitudinal and lateral axes, causing it to follow a [[helix|helical]] path, approximately maintaining its original direction. It is sometimes described as a "combination of a loop and a roll."<ref>{{cite web|url=https://www.iac.org/legacy/aerobatic-figures|title=Aerobatic Figures|work=[[International Aerobatic Club]] }}</ref> 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. The barrel roll is commonly confused with an [[aileron roll]].
==Etymology==
The barrel roll is so named because an aircraft executing this maneuver looks as though it were flying with its wheels running around the inside wall of a cylinder, or an imaginary barrel lying on its side. A more common modern visualization is to imagine an airplane trying to fly in a horizontal corkscrew around the line of the direction of travel.<ref>''Advanced Control of Aircraft, Spacecraft and Rockets'' By Ashish Tewari -- John Wiley and Sons 2011 Page 193</ref> Although the maneuver predates the name, the term was first used in 1917, gaining popularity during the early 1930s.<ref>''Merriam-Webster's Collegiate Dictionary: Eleventh Edition'' By Merriam-Webster Inc -- 2011 Page 100</ref>
==Aviation==
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