Barrel roll
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A barrel roll occurs when an object (usually an airplane or roller coaster) makes a complete rotation on its longitudinal axis while approximately maintaining its original direction.
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[edit] Barrel roll attack
In aviation a barrel roll attack is a maneuver that improves the attacker's offensive position and prevents the attacker from overshooting. In this maneuver the defender breaks one direction and so the attacker rolls the opposite direction from the defender's break then climbs to reduce closing speed. Finally the attacker completes the roll so he is level again and turns in behind the defender.
[edit] Barrel roll on skis
The barrel roll is also known for being a challenging trick to pull off on skis. The skier approaches a jump that will give him four feet of 'air' with both hands at shoulder level. Then, the skier looks throws his arm across his or her body in a downward motion to the left hip, before looking over his or her left shoulder at the ground while throwing his or her arm across his or her body. After that, the skier bends forward at the hips initiating a 360° forward flip. After the flip, the skier opens his or her arms and throws his or her right shoulder back before finally landing.
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