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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
115
If
the
angle
is
wrong,
it
should
then
be
corrected
as
follows:
If
it
is
too
great,
then
the
rear
spar
must
be
warped
up
until
it
is
right,
and
this
is
done
by
slackening
all
the
wires
going
to
the
top
of
the
strut,
and
then
tightening
all
the
wires
going
to
the
bottom
of
the
strut.
If
the
angle
is
too
small,
then
slacken
all
the
wires
going
to
the
bottom
of
the
strut,
and
tighten
all
the
wires
going
to
the
top
of
the
strut,
until
the
correct
adjustment
is
secured.
Never
attempt
to
adjust
the
angle
by
warping
the
main
spar.
The
set
measurement,
which
is
of
course
stated
in
the
aeroplane's
specifications,
should
be
accurate
to
1/16
inch.
LATERAL
DIHEDRAL
ANGLE.--One
method
of
securing
this
is
as
follows,
and
this
method
will,
at
the
same
time,
secure
the
correct
angle
of
incidence:
The
strings,
drawn
very
tight,
must
be
taken
over
both
the
main
and
rear
spars
of
the
top
surface.
They
must
run
between
points
on
the
spars
just
inside
the
outer
struts.
The
set
measurement
(which
should
be
accurate
to
1/16
inch
or
less)
is
then
from
the
strings
down
to
four
points
on
the
main
and
rear
spars
of
the
centre-section
surface.
These
points
should
be
just
inside
the
four
centre-section
struts;
that
is
to
say,
as
far
as
possible
away
from
the
centre
of
the
centre-section.
Do
not
attempt
to
take
the
set
measurement
near
the
centre
of
the
centre-section.
The
strings
should
be
as
tight
as
possible,
and,
if
it
can
be
arranged,
the
best
way
to
accomplish
that
is
as
shown
in
the
above
illustration,
i.e.,
by
weighting
the
strings
down
to
the
spars
by
means
of
weights
and
tying
their
ends
to
struts.
This
will
give
a
tight
and
motionless
string.
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