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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
14
And
the
Engine
was
so
mounted
that
when
the
Propeller-Thrust
was
horizontal,
which
is
its
most
efficient
position,
the
Angle
of
Incidence
and
the
Area
of
the
surfaces
were
just
sufficient
to
give
a
Lift
a
little
in
excess
of
the
Weight.
And
the
Camber
was
such
that,
as
far
as
it
was
concerned,
the
Lift-Drift
Ratio
should
be
the
best
possible
for
that
Angle
of
Incidence.
And
a
beautifully
simple
under-carriage
was
added,
the
outstanding
features
of
which
were
simplicity,
strength,
light-weight,
and
minimum
drift.
And,
last
of
all,
there
was
the
Elevator,
of
which
you
will
hear
more
by-and-by.
And
this
is
what
it
looked
like
then:
And
Efficiency,
smiling,
thought
that
it
was
not
such
a
bad
compromise
after
all,
and
that
the
Designer
might
well
be
satisfied.
"Now,"
said
she,
"there's
just
one
or
two
points
I'm
a
bit
hazy
about.
It
appears
that
when
the
Propeller
shaft
is
horizontal
and
so
working
in
its
most
efficient
attitude,
I
shall
have
a
Lift
from
the
Surfaces
slightly
in
excess
of
the
Weight.
That
means
I
shall
ascend
slightly,
at
the
same
time
making
nearly
maximum
speed
for
the
power
and
thrust.
Can't
I
do
better
than
that?"
"Yes,
indeed,"
spoke
up
the
Propeller,
"though
it
means
that
I
must
assume
a
most
undignified
attitude,
for
helicopters[2]
I
never
approved
of.
In
order
to
ascend
more
quickly
the
Pilot
will
deflect
the
Elevator,
which,
by
the
way,
you
see
hinged
to
the
Tail.
By
that
means
he
will
force
the
whole
Aeroplane
to
assume
a
greater
Angle
of
Incidence.
And
with
greater
Angle,
the
Lift
will
increase,
though
I'm
sorry
to
say
the
Drift
will
increase
also.
Owing
to
the
greater
Drift,
the
Speed
through
the
air
will
lessen,
and
I'm
afraid
that
won't
be
helpful
to
the
Lift;
but
I
shall
now
be
pointing
upwards,
and
besides
overcoming
the
Drift
in
a
forward
direction,
I
shall
be
doing
my
best
to
haul
the
Aeroplane
skywards.
At
a
certain
angle
known
as
the
Best
Climbing
Angle,
we
shall
have
our
Maximum
Margin
of
Lift,
and
I'm
hoping
that
may
be
as
much
as
almost
a
thousand
feet
altitude
a
minute."
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