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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
18
"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
by
a
gust
of
air
the
Aeroplane
is
blown
out
of
its
course
and
points
in
another
direction,
it
doesn't
immediately
fly
off
on
that
new
course.
I'm
so
strong
I
pull
it
off
the
new
course
to
a
certain
extent,
and
towards
the
direction
of
the
old
course.
And
so
it
travels,
as
long
as
my
strength
lasts,
in
a
more
or
less
sideways
position."
"Then,"
said
the
Keel-Surface,
"I
get
a
pressure
of
air
all
on
one
side,
and
as
there
is,
in
effect,
most
of
me
towards
the
tail,
the
latter
gets
pressed
sideways,
and
the
Aeroplane
thus
tends
to
assume
its
first
position
and
course."
"I
see,"
said
Efficiency,
and,
daintily
holding
the
Chalk,
she
approached
the
Blackboard.
"Is
this
what
you
mean?"
"Yes,
that's
right
enough,"
said
the
Keel-Surface,
"and
you
might
remember,
too,
that
I
always
make
the
Aeroplane
nose
into
the
gusts
rather
than
away
from
them."
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