This yawing effect produced by rolling motion is known as adverse yaw. Yaw control is achieved by yawing the 3BSM. The gyroscopic effect thus generated stopped the pitching and yawing, improving both aerodynamics and accuracy. A rudder input is required to counteract the yawing tendency. "Lateral-directional" modes involve rolling motions and yawing motions. Each plane corresponds to the rolling, pitching, or yawing motions of an aircraft. Milton D. McLaughlin goes into detail on pitches, yawing, climb outs, and other maneuvering techniques. The result was that the upward-moving wing was dragged backwards, yawing the glider. A positive yawing motion moves the nose of the aircraft to the right. Following flights revealed a propensity to "Dutch roll" - an alternating yawing and rolling motion. For this the slope of the yawing moment curve must be positive. The aircraft is centered around the testing of yawing without a vertical stabilizer.