axis transverse
to the line of flight and extending centrally along the body aeroplane
in the direction of the elongation aeroplane, substantially as
described.

10. In a flying machine, two aeroplanes, each normally flat and
elongated transversely to the line of flight, and upright standards
connecting the edges of said aeroplanes to maintain their equidistance,
the connections between said standards and aeroplanes being by means of
flexible joints, in combination with means for simultaneously imparting
to each of said aeroplanes a helicoidal warp around an axis transverse
to the line of flight and extending centrally along the body of the
aeroplane in the direction of the aeroplane, substantially as described.

11. In a flying machine, two aeroplanes, each normally flat and
elongated transversely to the line of flight, and upright standards
connecting the edges of said aeroplanes to maintain their equidistance,
the connections between such standards and aeroplanes being by means of
flexible joints, in combination with means for simultaneously imparting
to each of said aeroplanes a helicoidal warp around an axis transverse
to the line of flight and extending centrally along the body of the
aeroplane in the direction of the elongation of the aeroplane, a
vertical rudder, and means whereby said rudder is caused to present to
the wind that side thereof nearest the side of the aeroplanes having
the smaller angle of incidence and offering the least resistance to the
atmosphere, substantially as described.

12. In a flying machine, the combination, with an aeroplane, of a
normally flat and substantially horizontal flexible rudder, and means
for curving said rudder rearwardly and upwardly or rearwardly and
downwardly with respect to its normal plane, substantially as described.

13. In a flying machine, the combination, with an aeroplane, of a
normally flat and substantially horizontal flexible rudder pivotally
mounted on an axis transverse to the line of flight near its centre,
springs resisting vertical movement of the front edge of said rudder,
and means for moving the rear edge of said rudder, above or below the
normal plane thereof, substantially as described.

14. A flying machine comprising superposed connected aeroplanes means
for moving the opposite lateral portions of said aeroplanes to different
angles to the normal planes thereof, a vertical rudder, means for moving
said vertical rudder toward that side of t