A barrel roll is a positive g maneuver, but depending on where in the roll you are varies from maybe .5g to 2 or 3g. The gliders I fly are rated for spins and loops but not any roll maneuvers. Most small production powered planes are not rated for any aerobatic maneuvers, doesn't mean they couldn't do one, just that they shouldn't as the manufacturer won't guarantee the wings will stay on.

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