The high center of gravity in all machines makes
the weight useless to counterbalance the rising
end or to hold up the depressed wing.

All aviators agree that these unequal areas of
density extend over small spaces, and it is, therefore,
obvious that a machine which is of such a
structure that it moves through the air broadside
on, will be more liable to meet these inequalities
than one which is narrow and does not take in such
a wide path.

Why, therefore, persist in making a form which,
by its very nature, invites danger? Because birds
fly that way!

THE TURNING MOVEMENT.--This structural arrangement
accentuates the difficulty when the machine
turns. The air pressure against the wing
surface is dependent on the speed. The broad
outstretched surfaces compel the wing at the outer
side of the circle to travel faster than the inner
one. As a result, the outer end of the aeroplane
is elevated.

CENTRIFUGAL ACTION.--At the same time the
running gear, and the frame which carries it and
supports the machine while at rest, being below
the planes, a centrifugal force is exerted, when