such a funny man. He objects to skin friction,[[5]] and insisted
upon me changing my fabric for one of a smoother
surface, and that delayed me. Dear me, there are a lot
more of us to-day, aren't there? I think I had better meet
one at a time.'' And turning to Directional Stability, she
politely asked him what he preferred to do.


[[4]] Morane parasol: A type of Morane monoplane in which the
lifting surfaces are raised above the pilot in order to afford
him a good view of the earth.

[[5]] Skin friction is that part of the drift due to the friction
of the air with roughnesses upon the surface of the aeroplane.


``My purpose in life, miss,'' said he, ``is to keep the Aeroplane
on its course, and to achieve that there must be, in
effect, more Keel-Surface behind the Vertical Turning Axis
than there is in front of it.''

Efficiency looking a little puzzled, he added: ``Just like
a weathercock, and by Keel-Surface I mean everything
you can see when you view the Aeroplane from the side of
it--the sides of the body, struts, wires, etc.''

``Oh, now I begin to see light,'' said she: ``but just
exactly how does it work?''

``I'll answer that,'' said Momentum. ``When perhaps