The Mode of Motion. The Wing Structure.
The Wing Movement. The Helicopter Motion.

CHAPTER VI. THE LIFTING SURFACES OF AEROPLANES
Relative Speed and Angle. Narrow Planes Most Effective.
Stream Lines Along a Plane. The Center of
Pressure. Air Lines on the Upper Side of a Plane.
Rarefied Area. Rarefaction Produced by Motion. The
Concaved Plane. The Center of Pressure. Utilizing
the Rarefied Area. Changing Center of Pressure.
Plane Monstrosities. The Bird Wing Structure.
Torsion. The Bat's Wing. An Abnormal Shape. The
Tail as a Monitor.

CHAPTER VII. ABNORMAL FLYING STUNTS AND SPEEDS
Lack of Improvements in Machines. Men Exploited
and not Machines. Abnormal Flying of no Value.
The Art of Juggling. Practical Uses the Best Test.
Concaved and Convex Planes. How Momentum is a
Factor in Inverted Flying. The Turning Movement.
When Concaved Planes are Desirable. The Speed
Mania. Uses of Flying Machines. Perfection in Machines
Must Come Before Speed. The Range of its
Uses. Commercial Utility.

CHAPTER VIII. KITES AND GLIDERS
The Dragon Kite. Its Construction. The Malay
Kite. Dihedral Angle. The Common Kite. The Bow
Kite. The Box Kite. The Voison Bi-plane. Lateral
Stability in Kites, not Conclusive as to Planes. The