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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
108
As
a
general
rule
the
wires
of
an
aeroplane
are
tensioned
too
much.
The
tension
should
be
sufficient
to
keep
the
framework
rigid.
Anything
more
than
that
lowers
the
factor
of
safety,
throws
various
parts
of
the
framework
into
undue
compression,
pulls
the
fittings
into
the
wood,
and
will,
in
the
end,
distort
the
whole
framework
of
the
aeroplane.
Only
experience
will
teach
the
rigger
what
tension
to
employ.
Much
may
be
done
by
learning
the
construction
of
the
various
types
of
aeroplanes,
the
work
the
various
parts
do,
and
in
cultivating
a
touch
for
tensioning
wires
by
constantly
handling
them.
5.
Wires
with
no
Opposition
Wires.--In
some
few
cases
wires
will
be
found
which
have
no
opposition
wires
pulling
in
the
opposite
direction.
For
instance,
an
auxiliary
lift
wire
may
run
from
the
bottom
of
a
strut
to
a
spar
in
the
top
plane
at
a
point
between
struts.
In
such
a
case
great
care
should
be
taken
not
to
tighten
the
wire
beyond
barely
taking
up
the
slack.
Such
a
wire
must
be
a
little
slack,
or,
as
illustrated
above,
it
will
distort
the
framework.
That,
in
the
example
given,
will
spoil
the
camber
(curvature)
of
the
surface,
and
result
in
changing
both
the
lift
and
the
drift
at
that
part
of
the
surface.
Such
a
condition
will
cause
the
aeroplane
to
lose
its
directional
stability
and
also
to
fly
one
wing
down.
I
cannot
impress
this
matter
of
tension
upon
the
reader
too
strongly.
It
is
of
the
utmost
importance.
When
this,
and
also
accuracy
in
securing
the
various
adjustments,
has
been
learned,
one
is
on
the
way
to
becoming
a
good
rigger.
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