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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
10
"Well,
we
are
getting
within
sight
of
those
interesting
Factors,"
said
the
Lift-Drift
Ratio,
"but
first
of
all
we
had
better
decide
upon
the
Area
of
the
Surfaces,
their
Angle
of
Incidence
and
Camber.
If
we
are
to
ascend
as
quickly
as
possible
the
Aeroplane
must
be
slow
in
order
to
secure
the
best
possible
lift-drift
ratio;
for
the
drift
of
the
struts,
wires,
body,
etc.,
increases
approximately
as
the
square
of
the
speed,
but
it
carries
with
it
no
lift
as
it
does
in
the
case
of
the
Surface.
The
less
speed
then,
the
less
such
drift,
and
the
better
the
Aeroplane's
proportion
of
lift
to
drift;
and,
being
slow,
we
shall
require
a
large
Surface
in
order
to
secure
a
large
lift
relative
to
the
weight
to
be
carried.
We
shall
also
require
a
large
Angle
of
Incidence
relative
to
the
horizontal,
in
order
to
secure
a
proper
inclination
of
the
Surface
to
the
direction
of
motion,
for
you
must
remember
that,
while
we
shall
fly
upon
an
even
keel
and
with
the
propeller
thrust
horizontal
(which
is
its
most
efficient
attitude),
our
flight
path,
which
is
our
direction
of
motion,
will
be
sloping
upwards,
and
it
will
therefore
be
necessary
to
fix
the
Surface
to
the
Aeroplane
at
a
very
considerable
angle
relative
to
the
horizontal
Propeller
Thrust
in
order
to
secure
a
proper
angle
to
the
upwards
direction
of
motion.
Apart
from
that,
we
shall
require
a
larger
Angle
of
Incidence
than
in
the
case
of
a
machine
designed
purely
for
speed,
and
that
means
a
correspondingly
large
Camber.
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