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V1
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Decision speed - before this speed you can abort a take off and stop safely. - After this speed you must continue and take off.
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Va
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Maximum speed for abrupt and extreme control maneuvers without exceeding load limit
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Vfe
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Maximum flap extension speed
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Vmca
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Maximum Control Air speed
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Vmo
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Maximum Operating Speed
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Vne
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Never exceed speed
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Vno
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Normal Operating Speed
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Vr
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Rotation Speed, at which to raise the nose for takeoff
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Vso
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Stall Speed
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Vx
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Best Angle of Climb Speed
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Vxse
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Best Engine Out Angle of Climb Speed
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Vy
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Best Rate of Climb Speed
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Vyse
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Best Engine Out Rate of Climb Speed
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