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A fixed vertical fin or fins that provide an aircraft with passive directional stability (keep it from spontaneously yawing sideways into a sideslip), and often serve as the mounting point for the aircraft's rudder(s).
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votes
Is a vertical stabiliser needed for straight line flight in a glider?
Some swept-wing designs have no vertical surfaces e.g. "Horten" or "flying wing" or "Alsomitra".
NASA's Albion Bowers presented recent advances in "Why Birds Don't Have Vertical Tails" and "On the Min …