the horizontal, in order to secure a proper inclination of
the Surface to the direction of motion, for you must remember
that, while we shall fly upon an even keel and with
the propeller thrust horizontal (which is its most efficient
attitude), our flight path, which is our direction of motion,
will be sloping upwards, and it will therefore be necessary
to fix the Surface to the Aeroplane at a very considerable
angle relative to the horizontal Propeller Thrust in order to
secure a proper angle to the upwards direction of motion.
Apart from that, we shall require a larger Angle of Incidence
than in the case of a machine designed purely for speed,
and that means a correspondingly LARGE CAMBER.

``On the other hand, if we are thinking merely of Speed,
then a SMALL SURFACE, just enough to lift the weight off the
ground, will be best, also a SMALL ANGLE to cut the Drift down
and that, of course, means a relatively SMALL CAMBER.

``So you see the essentials for CLIMB or quick ascent and
for SPEED are diametrically opposed. Now which is it to be?''

``Nothing but perfection for me,'' said Efficiency. ``What
I want is Maximum Climb and Maximum Speed for the
Power the Engine produces.''

And each Principle fully agreed with her beautiful
sentiments, but work together they would not.

The Aspect Ratio wanted infinite Span, and hang the
Chord.