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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
119
If
these
over-all
measurements
are
not
correct,
then
it
is
probably
due
to
some
of
the
drift
or
anti-drift
wires
being
too
tight
or
too
slack.
It
may
possibly
be
due
to
the
fuselage
being
out
of
truth,
but
of
course
the
rigger
should
have
made
quite
sure
that
the
fuselage
was
true
before
rigging
the
rest
of
the
machine.
Again,
it
may
be
due
to
the
internal
bracing
wires
within
the
lifting
surfaces
not
being
accurately
adjusted,
but
of
course
this
should
have
been
seen
to
before
covering
the
surfaces
with
fabric.
FUSELAGE.--The
method
of
truing
the
fuselage
is
laid
down
in
the
aeroplane's
specifications.
After
it
has
been
adjusted
according
to
the
specified
directions,
it
should
then
be
arranged
on
trestles
in
such
a
way
as
to
make
about
three-quarters
of
it
towards
the
tail
stick
out
unsupported.
In
this
way
it
will
assume
a
condition
as
near
as
possible
to
flying
conditions,
and
when
it
is
in
this
position
the
set
measurements
should
be
confirmed.
If
this
is
not
done
it
may
be
out
of
truth,
but
perhaps
appear
all
right
when
supported
by
trestles
at
both
ends,
as,
in
such
case,
its
weight
may
keep
it
true
as
long
as
it
is
resting
upon
the
trestles.
THE
TAIL-PLANE
(EMPENNAGE).--The
exact
angle
of
incidence
of
the
tail-plane
is
laid
down
in
the
aeroplane's
specifications.
It
is
necessary
to
make
sure
that
the
spars
are
horizontal
when
the
aeroplane
is
in
flying
position
and
the
tail
unsupported
as
explained
above
under
the
heading
of
Fuselage.
If
the
spars
are
tapered,
then
make
sure
that
their
centre
lines
are
horizontal.
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