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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
110
CONTROLLING
SURFACES.--The
greatest
care
should
be
exercised
in
rigging
the
aileron,
rudder,
and
elevator
properly,
for
the
pilot
entirely
depends
upon
them
in
managing
the
aeroplane.
The
ailerons
and
elevator
should
be
rigged
so
that,
when
the
aeroplane
is
in
flight,
they
are
in
a
fair
true
line
with
the
surface
in
front
and
to
which
they
are
hinged.
If
the
surface
to
which
they
are
hinged
is
not
a
lifting
surface,
then
they
should
be
rigged
to
be
in
a
fair
true
line
with
it
as
illustrated
above.
If
the
controlling
surface
is,
as
illustrated,
hinged
to
the
back
of
a
lifting
surface,
then
it
should
be
rigged
a
little
below
the
position
it
would
occupy
if
in
a
fair
true
line
with
the
surface
in
front.
This
is
because,
in
such
a
case,
it
is
set
at
an
angle
of
incidence.
This
angle
will,
during
flight,
cause
it
to
lift
a
little
above
the
position
in
which
it
has
been
rigged.
It
is
able
to
lift
owing
to
a
certain
amount
of
slack
in
the
control
wire
holding
it--and
one
cannot
adjust
the
control
wire
to
have
no
slack,
because
that
would
cause
it
to
bind
against
the
pulleys
and
make
the
operation
of
it
too
hard
for
the
pilot.
It
is
therefore
necessary
to
rig
it
a
little
below
the
position
it
would
occupy
if
it
was
rigged
in
a
fair
true
line
with
the
surface
in
front.
Remember
that
this
only
applies
when
it
is
hinged
to
a
lifting
surface.
The
greater
the
angle
of
incidence
(and
therefore
the
lift)
of
the
surface
in
front,
then
the
more
the
controlling
surface
will
have
to
be
rigged
down.
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