Have a knowledge of the theory of the aeroplane, helicopter, and ornithopter, and of the spherical and dirigible balloon.
The ornithopter has hinged planes which work like the wings of a bird.
The ornithopter landed with a certain skilful precision and its wings ceased to beat.
This experiment remains as the greatest success yet achieved by any machine constructed on the ornithopter principle.
The six men on the ornithopter put their shoulders to their machine and trundled it out of the way.
ornithopter (or Orthopter)—A flapping wing design of aircraft intended to imitate the flight of a bird.
Red clover bent and writhed in the artificial wind from the ornithopter wings.
Wing—Strictly speaking, a wing is one of the surfaces of an ornithopter.