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The Aeroplane Speaks. Fifth Edition
·
H. Barber
88
Unfortunately,
however,
the
righting
effect
is
not
proportional
to
the
difference
between
the
right
and
left
H.E.'s.
In
the
case
of
A,
the
resultant
direction
of
the
reaction
of
both
wings
is
opposed
to
the
direction
of
gravity
or
weight.
The
two
forces
R
R
and
gravity
are
then
evenly
balanced,
and
the
surface
is
in
a
state
of
equilibrium.
In
the
case
of
B,
you
will
note
that
the
R
R
is
not
directly
opposed
to
gravity.
This
results
in
the
appearance
of
M,
and
so
the
resultant
direction
of
motion
of
the
aeroplane
is
no
longer
directly
forward,
but
is
along
a
line
the
resultant
of
the
Thrust
and
M.
In
other
words,
it
is,
while
flying
forward,
at
the
same
time
moving
sideways
in
the
direction
M.
In
moving
sideways,
the
keel-surface
receives,
of
course,
a
pressure
from
the
air
equal
and
opposite
to
M.
Since
such
surface
is
greatest
in
effect
towards
the
tail,
then
the
latter
must
be
pushed
sideways.
That
causes
the
aeroplane
to
turn;
and,
the
highest
wing
being
on
the
outside
of
the
turn,
it
has
a
greater
velocity
than
the
lower
wing.
That
produces
greater
lift,
and
tends
to
tilt
the
aeroplane
over
still
more.
Such
tilting
tendency
is,
however,
opposed
by
the
difference
in
the
H.E.'s
of
the
two
wings.
It
then
follows
that,
for
the
lateral
dihedral
angle
to
be
effective,
such
angle
must
be
large
enough
to
produce,
when
the
aeroplane
tilts,
a
difference
in
the
H.E.'s
of
the
two
wings,
which
difference
must
be
sufficient
to
not
only
oppose
the
tilting
tendency
due
to
the
aeroplane
turning,
but
sufficient
to
also
force
the
aeroplane
back
to
its
original
position
of
equilibrium.
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