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BALANCING
CONTROL
SURFACES
Control
surfaces
ordinarily
need not be rebalanced
unless
they
are
repainted,
repaired
or have
parts
replaced.
When repainting,
hang the
control
surfaces
by
the trailing
edge so excess
paint will drain
toward the
leading
edge.
Mark
the
chord
line of each
control
surface
and,
with
the
surface
supported
by
the jig
and spindle,
adjust
the
spindle
until
the
bubble
of a bubble
protractor
or
level
held
on
the
marked
chord
line is centered.
The surfaces
must balance
within
the
limits
given for each;
deviations
must be
corrected
by adding
or
removing
weight.
If
the
aileron,
for example,
were
tail-
heavy by
.72
inch-pounds,
you would add
the
required
amount
of
nose heaviness
(O. 2
inch-pounds)
to
give
the total
amount
of
tail-heavy
balance
that
must
be
compensated
for.
Use
this
formula
to
determine
the
amount
of weight
to
add:
Y(X)
=
B
Y
=
Distance
in inches
from
hinge
center
line
to
center
line of
the
balance
weight.
X
=
The unknown
weight
to
be
added.
Using
3
inches
as
an
example
of
the
distance
Y,
we have:
3X
=
0. 92
inch-pounds
X
=
0.306
pounds
of
weight
to
be added.
BALANCING THE AILERON
The painted
aileron assembly
must
be nose-heavy
by 0. 2
to
1.
5 inch-pounds.
Use
this
equation
to
figure
the
overbalance.
Static
Nose Heaviness
=
D(W-S)
D
=
Distance
in inches
from hinge
center
line
to
point
where spindle supports
the
aileron.
S
=
Weight
of spindle (in
pounds)
used
to
support
leading
edge
of aileron.
W
=
Scale
reading
of
platform
scale
in pounds.
3-10
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