this problem. The Douglas Skyray was not able to incorporate any design changes to control inertial roll coupling and instead had restricted maneuver limits at which coupling effects did not cause problems. The Lockheed F-104 Starfighter (first flown in 1956) had its stabilator (horizontal tail surface) mounted atop its vertical fin to reduce inertia coupling. See also Upset Prevention and Recovery Training References Aviation risks Aerodynamics Chuck Yeager