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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
13
Thud!
What
was
that?
Efficiency
had
fainted
dead
away!
The
last
blow
had
been
too
much
for
her.
And
the
Principles
gathered
mournfully
round,
but
with
the
aid
of
the
Propeller
Slip[1]
and
a
friendly
lift
from
the
Surface
she
was
at
length
revived
and
regained
a
more
normal
aspect.
Said
the
Stagger
with
a
raffish
air,
"My
dear
young
lady,
I
assure
you
that
from
the
experiences
of
a
varied
career,
I
have
learned
that
perfection
is
impossible,
and
I
am
sure
the
Designer
will
be
quite
satisfied
if
you
become
the
Most
Efficient
Compromise."
"Well,
that
sounds
so
common
sense,"
sighed
Efficiency,
"I
suppose
it
must
be
true,
and
if
the
Designer
is
satisfied,
that's
all
I
really
care
about.
Now
do
let's
get
on
with
the
job."
So
the
Chalk
drew
a
nice
long
slim
body
to
hold
the
Engine
and
the
tanks,
etc.,
with
room
for
the
Pilot's
and
Passenger's
seats,
and
placed
it
exactly
in
the
middle
of
the
Biplane.
And
he
was
careful
to
make
its
position
such
that
the
Centre
of
Gravity
was
a
little
in
advance
of
the
Centre
of
Lift,
so
that
when
the
Engine
was
not
running
and
there
was
consequently
no
Thrust,
the
Aeroplane
should
be
"nose-heavy"
just
to
the
right
degree,
and
so
take
up
a
natural
glide
to
Earth--and
this
was
to
help
the
Pilot
and
relieve
him
of
work
and
worry,
should
he
find
himself
in
a
fog
or
a
cloud.
And
so
that
this
tendency
to
glide
downwards
should
not
be
in
evidence
when
the
Engine
was
running
and
descent
not
desired,
the
Thrust
was
placed
a
little
below
the
Centre
of
Drift
or
Resistance.
In
this
way
it
would
in
a
measure
pull
the
nose
of
the
Aeroplane
up
and
counter-balance
the
"nose-heavy"
tendency.
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