Technique changing direction freely without vertical tail

　It is to produce a current that gives the moment in the turning direction
with respect to the center of gravity.
　The more (the moment)/(the moment of inertia) is large, the more
the turning becomes sharp.

　It inclines the horizontally spread wing to the turning direction.

　It twists the spread tail to the turning direction.

　It puts saide the center of gravity to the turning direction.
(It puts aside the head to the turning direction. It extends the leg of
turning direction side on its side.)

　It discriminates the thrust on the left- and right-side wing.
(It flaps strongly the wing in opposite-side to the turning direction.
It makes larger the angle of attack of the wing in opposite-side to
the turning direction.)

　The vertical rotation accompanied with the horizontal turning only by the
flat tail will be able to canceled out by shifting the wing to back or forth.

　A bird can turn freely the direction by the cooperation of the wing and
the tail without a vertical tail.

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