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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
136
Now
line
up
the
centre
part
of
the
main-plane
with
the
tail-plane.
The
latter
should
be
symmetrical
with
it.
Next,
sight
each
interplane
front
strut
with
its
rear
strut.
They
should
be
parallel.
Then,
standing
on
one
side
of
the
aeroplane,
sight
all
the
front
struts.
The
one
nearest
to
you
should
cover
all
the
others.
This
applies
to
the
rear
struts
also.
Look
for
distortion
of
leading
edges,
main
and
rear
spars,
trailing
edges,
tail-plane,
and
controlling
surfaces.
This
sort
of
thing,
if
practised
constantly,
will
not
only
develop
an
expert
eye
for
diagnosis
of
faults,
but
will
also
greatly
assist
in
impressing
upon
the
memory
the
characteristics
and
possible
troubles
of
the
various
types
of
aeroplanes.
MISHANDLING
ON
THE
GROUND.--This
is
the
cause
of
a
lot
of
unnecessary
damage.
The
golden
rule
to
observe
is,
PRODUCE
NO
BENDING
STRESSES.
Nearly
all
the
wood
in
an
aeroplane
is
designed
to
take
merely
the
stress
of
direct
compression,
and
it
cannot
be
bent
safely.
Therefore,
in
packing
an
aeroplane
up
from
the
ground,
or
in
pulling
or
pushing
it
about,
be
careful
to
stress
it
in
such
a
way
as
to
produce,
as
far
as
possible,
only
direct
compression
stresses.
For
instance,
if
it
is
necessary
to
support
the
lifting
surface,
then
the
packing
should
be
arranged
to
come
directly
under
the
struts
so
that
they
may
take
the
stress
in
the
form
of
compression
for
which
they
are
designed.
Such
supports
should
be
covered
with
soft
packing
in
order
to
prevent
the
fabric
from
becoming
damaged.
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