(1) The control stick "B" is used by the pilot for controlling the aerodynamic surfaces of the airplane. In general, these 3 axis of rotation are perpendicular to each other and lie somewhere near the center of mass of the airplane.
(1) Pitch is a rotation about the front wing axis as controlled by the elevators on the tail wings "C".
(2) Roll is rotation about the axis of the fuselage as controlled by the ailerons "A".
(3) Yaw is rotation about the axis that is perpindicular to the plane of those other two axis, and is controlled by the tail rudder "D".
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