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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
39
Now
at
fifteen
thousand
feet
the
conditions
are
chilly
and
rare,
and
the
Pilot,
with
thoughts
of
breakfast
far
below,
exclaims,
"High
enough!
I
had
better
get
on
with
the
Test."
And
then,
as
he
depresses
the
Elevator,
the
Aeroplane
with
relief
assumes
its
normal
horizontal
position.
Then,
almost
closing
the
Throttle,
the
Thrust
dies
away.
Now,
the
nose
of
the
Aeroplane
should
sink
of
its
own
volition,
and
the
craft
glide
downward
at
flying
speed,
which
is
in
this
case
a
hundred
miles
an
hour.
That
is
what
should
happen
if
the
Designer
has
carefully
calculated
the
weight
of
every
part
and
arranged
for
the
centre
of
gravity
to
be
just
the
right
distance
in
front
of
the
centre
of
lift.
Thus
is
the
Aeroplane
"nose-heavy"
as
a
glider,
and
just
so
to
a
degree
ensuring
a
speed
of
glide
equal
to
its
flying
speed.
And
the
Air
Speed
Indicator
is
steady
at
one
hundred
miles
an
hour,
and
"That's
all
right!"
exclaims
the
Pilot.
"And
very
useful,
too,
in
a
fog
or
a
cloud,"
he
reflects,
for
then
he
can
safely
leave
the
angle
of
the
glide
to
itself,
and
give
all
his
attention,
and
he
will
need
it
all,
to
keeping
the
Aeroplane
horizontal
from
wing-tip
to
wing-tip,
and
to
keeping
it
straight
on
its
course.
The
latter
he
will
manage
with
the
rudder,
controlled
by
his
feet,
and
the
Compass
will
tell
him
whether
a
straight
course
is
kept.
The
former
he
will
control
by
the
ailerons,
or
little
wings
hinged
to
the
tips
of
the
planes,
and
the
bubble
in
the
Inclinometer
in
front
of
him
must
be
kept
in
the
middle.
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