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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
26
"Yes,"
said
the
Lateral
and
Directional
Stabilities
in
one
voice,
"that's
so,
and
the
wash-out
helps
us
also,
for
then
the
Surfaces
towards
their
Wing-tips
have
less
Drift
or
'Head-Resistance,'
and
consequently
the
gusts
will
affect
them
and
us
less;
but
such
decreased
Angle
of
Incidence
means
decreased
Lift
as
well
as
Drift,
and
the
Designer
does
not
always
care
to
pay
the
price."
"Well,"
said
the
Ailerons,
"if
it's
not
done
it
will
mean
more
work
for
the
Rudder,
and
that
won't
please
the
Pilot."
"Whatever
do
you
mean?"
asked
Efficiency.
"What
can
the
Rudder
have
to
do
with
you?"
"It's
like
this,"
they
replied:
"when
we
are
deflected
downwards
we
gain
a
larger
Angle
of
Incidence
and
also
enter
an
area
of
compressed
air,
and
so
produce
more
Drift
than
those
of
us
on
the
other
side
of
the
Aeroplane,
which
are
deflected
upwards
into
an
area
of
rarefied
air
due
to
the
suction
effect
(though
that
term
is
not
academically
correct)
on
the
top
of
the
Surface.
If
there
is
more
Drift,
i.e.,
Resistance,
on
one
side
of
the
Aeroplane
than
on
the
other
side,
then
of
course
it
will
turn
off
its
course,
and
if
that
difference
in
Drift
is
serious,
as
it
will
very
likely
be
if
there
is
no
wash-out,
then
it
will
mean
a
good
deal
of
work
for
the
Rudder
in
keeping
the
Aeroplane
on
its
course,
besides
creating
extra
Drift
in
doing
so."
"I
think,
then,"
said
Efficiency,
"I
should
prefer
to
have
that
wash-out,[7]
and
my
friend
the
Designer
is
so
clever
at
producing
strength
of
construction
for
light
weight,
I'm
pretty
sure
he
won't
mind
paying
the
price
in
Lift.
And
now
let
me
see
if
I
can
sketch
the
completed
Aeroplane."
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