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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
92
A
high
C.G.
also
tends
to
swing
outward
from
the
centre
of
the
turn.
It
will
tend
to
make
the
aeroplane
bank
the
wrong
way,
and
such
effect
must
be
remedied
by
means
of
the
ailerons.
The
pleasantest
machine
from
a
banking
point
of
view
is
one
in
which
the
C.G.
is
a
little
below
the
centre
of
drift.
It
tends
to
bank
the
aeroplane
the
right
way
for
the
turn,
and
the
pilot
can,
if
necessary,
perfect
the
bank
by
means
of
the
ailerons.
The
disposition
of
the
keel-surface
affects
banking.
It
should
be,
in
effect,
evenly
divided
by
the
longitudinal
axis.
An
excess
of
keel-surface
above
the
longitudinal
axis
will,
when
banking,
receive
an
air
pressure
causing
the
aeroplane
to
bank,
perhaps
too
much.
An
excess
of
keel-surface
below
the
axis
has
the
reverse
effect.
SIDE-SLIPPING.--This
usually
occurs
as
a
result
of
over-banking.
It
is
always
the
result
of
the
aeroplane
tilting
sideways
and
thus
decreasing
the
horizontal
equivalent,
and
therefore
the
lift,
of
the
surface.
An
excessive
"bank,"
or
sideways
tilt,
results
in
the
H.E.,
and
therefore
the
lift,
becoming
less
than
the
weight,
when,
of
course,
the
aeroplane
must
fall,
i.e.,
side-slip.
When
making
a
very
sharp
turn
it
is
necessary
to
bank
very
steeply
indeed.
If,
at
the
same
time,
the
longitudinal
axis
of
the
aeroplane
remains
approximately
horizontal,
then
there
must
be
a
fall,
and
the
direction
of
motion
will
be
the
resultant
of
the
thrust
and
the
fall
as
illustrated
above
in
sketch
A.
The
lifting
surfaces
and
the
controlling
surfaces
are
not
then
meeting
the
air
in
the
correct
attitude,
with
the
result
that,
in
addition
to
falling,
the
aeroplane
will
probably
become
quite
unmanageable.
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