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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
111
As
a
general
rule
it
is
safe
to
rig
it
down
so
that
its
trailing
edge
is
1/2
to
3/4
inch
below
the
position
it
would
occupy
if
in
a
fair
line
with
the
surface
in
front;
or
about
1/2
inch
down
for
every
18
inches
of
chord
of
the
controlling
surface.
When
making
these
adjustments
the
pilot's
control
levers
should
be
in
their
neutral
positions.
It
is
not
sufficient
to
lash
them.
They
should
be
rigidly
blocked
into
position
with
wood
packing.
The
surfaces
must
not
be
distorted
in
any
way.
If
they
are
held
true
by
bracing
wires,
then
such
wires
must
be
carefully
adjusted.
If
they
are
distorted
and
there
are
no
bracing
wires
with
which
to
true
them,
then
some
of
the
internal
framework
will
probably
have
to
be
replaced.
The
controlling
surfaces
should
never
be
adjusted
with
a
view
to
altering
the
stability
of
the
aeroplane.
Nothing
can
be
accomplished
in
that
way.
The
only
result
will
be
to
spoil
the
control
of
the
aeroplane.
FABRIC-COVERED
SURFACES.--First
of
all
make
sure
that
there
is
no
distortion
of
spars
or
ribs,
and
that
they
are
perfectly
sound.
Then
adjust
the
internal
bracing
wires
so
that
the
ribs
are
parallel
to
the
direction
of
flight.
The
ribs
usually
cause
the
fabric
to
make
a
ridge
where
they
occur,
and,
if
such
ridge
is
not
parallel
to
the
direction
of
flight,
it
will
produce
excessive
drift.
As
a
rule
the
ribs
are
at
right
angles
to
both
main
and
rear
spars.
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