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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
118
If
a
mistake
is
made
and
the
measurement
taken
along
the
wrong
line,
it
may
result
in
a
difference
of
perhaps
1/4
inch
or
more
to
the
stagger,
with
the
certain
result
that
the
aeroplane
will,
in
flight,
be
nose-heavy
or
tail-heavy.
After
the
adjustments
of
the
angles
of
incidence,
dihedral,
and
stagger
have
been
secured,
it
is
as
well
to
confirm
all
of
them,
as,
in
making
the
last
adjustment,
the
first
one
may
have
been
spoiled.
OVER-ALL
ADJUSTMENTS.--The
following
over-all
check
measurements
should
now
be
taken.
The
straight
lines
AC
and
BC
should
be
equal
to
within
1/8
inch.
The
point
C
is
the
centre
of
the
propeller,
or,
in
the
case
of
a
"pusher"
aeroplane,
the
centre
of
the
nacelle.
The
points
A
and
B
are
marked
on
the
main
spar,
and
must
in
each
case
be
the
same
distance
from
the
butt
of
the
spar.
The
rigger
should
not
attempt
to
make
A
and
B
merely
the
sockets
of
the
outer
struts,
as
they
may
not
have
been
placed
quite
accurately
by
the
manufacturer.
The
lines
AC
and
BC
must
be
taken
from
both
top
and
bottom
spars--two
measurements
on
each
side
of
the
aeroplane.
The
two
measurements
FD
and
FE
should
be
equal
to
within
1/8
inch.
F
is
the
centre
of
the
fuselage
or
rudder-post.
D
and
E
are
points
marked
on
both
top
and
bottom
rear
spars,
and
each
must
be
the
same
fixed
distance
from
the
butt
of
the
spar.
Two
measurements
on
each
side
of
the
aeroplane.
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