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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
4
"I
act
in
the
direction
of
the
arrow
R,
that
is,
more
or
less,
for
the
direction
varies
somewhat
with
the
Angle
of
Incidence
and
the
curvature
of
the
Surface;
and,
strange
but
true,
I'm
stronger
on
the
top
of
the
Surface
than
at
the
bottom
of
it.
The
Wind
Tunnel
has
proved
that
by
exhaustive
research--and
don't
forget
how
quickly
I
can
grow!
As
the
speed
through
the
air
increases
my
strength
increases
more
rapidly
than
you
might
think--approximately,
as
the
Square
of
the
Speed;
so
you
see
that
if
the
Speed
of
the
Surface
through
the
air
is,
for
instance,
doubled,
then
I
am
a
good
deal
more
than
doubled.
That's
because
I
am
the
result
of
not
only
the
mass
of
air
displaced,
but
also
the
result
of
the
Speed
and
consequent
Force
with
which
the
Surface
engages
the
Air.
I
am
a
product
of
those
two
factors,
and
at
the
speeds
at
which
Aeroplanes
fly
to-day,
and
at
the
altitudes
and
consequent
density
of
air
they
at
present
experience,
I
increase
at
about
the
Square
of
the
Speed.
"Oh,
I'm
a
most
complex
and
interesting
personality,
I
assure
you--in
fact,
a
dual
personality,
a
sort
of
aeronautical
Dr.
Jekyll
and
Mr.
Hyde.
There's
Lift,
my
vertical
part
or
component,
as
those
who
prefer
long
words
would
say;
he
always
acts
vertically
upwards,
and
hates
Gravity
like
poison.
He's
the
useful
and
admirable
part
of
me.
Then
there's
Drift,
my
horizontal
component,
sometimes,
though
rather
erroneously,
called
Head
Resistance;
he's
a
villain
of
the
deepest
dye,
and
must
be
overcome
before
flight
can
be
secured."
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