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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
25
"And
now,"
said
Efficiency,
"I
have
only
to
meet
the
Ailerons
and
the
Rudder,
haven't
I?"
"Here
we
are,"
replied
the
Ailerons,
or
little
wings.
"Please
hinge
us
on
to
the
back
of
the
Main
Surfaces,
one
of
us
at
each
Wing-tip,
and
join
us
up
to
the
Pilot's
joystick
by
means
of
the
control
cables.
When
the
Pilot
wishes
to
tilt
the
Aeroplane
sideways,
he
will
move
the
stick
and
depress
us
upon
one
side,
thus
giving
us
a
larger
Angle
of
Incidence
and
so
creating
more
Lift
on
that
side
of
the
Aeroplane;
and,
by
means
of
a
cable
connecting
us
with
the
Ailerons
on
the
other
side
of
the
Aeroplane,
we
shall,
as
we
are
depressed,
pull
them
up
and
give
them
a
reverse
or
negative
Angle
of
Incidence,
and
that
side
will
then
get
a
reverse
Lift
or
downward
thrust,
and
so
we
are
able
to
tilt
the
Aeroplane
sideways.
"And
we
work
best
when
the
Angle
of
Incidence
of
the
Surface
in
front
of
us
is
very
small,
for
which
reason
it
is
sometimes
decreased
or
washed-out
towards
the
Wing-tips.
The
reason
of
that
is
that
by
the
time
the
air
reaches
us
it
has
been
deflected
downwards--the
greater
the
Angle
of
Incidence
the
more
it
is
driven
downwards--and
in
order
for
us
to
secure
a
Reaction
from
it,
we
have
to
take
such
a
large
Angle
of
Incidence
that
we
produce
a
poor
proportion
of
Lift
to
Drift;
but
the
smaller
the
Angle
of
the
Surface
in
front
of
us
the
less
the
air
is
deflected
downwards,
and
consequently
the
less
Angle
is
required
of
us,
and
the
better
our
proportion
of
Lift
to
Drift,
which,
of
course,
makes
us
much
more
effective
Controls."
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