CESSNA
MODEL 172R
SECTION
1
GENERAL
WEIGHT
AND BALANCE TERMINOLOGY
Reference
Reference Datum
is
an
imaginary vertical
plane from
Datum
which all
horizontal distances are measured for
balance purposes.
Station
Arm
Station
is
a
location
along
the
airplane fuselage
given
in
terms
of the distance from the reference datum.
Arm
is the horizontal distance from
the
reference
datum
to
the center of gravity (C.G.)
of
an
item.
Moment
Center of
Gravity
(C.G.)
Moment
is
the product of the
weight of
an item
multiplied
by
its
arm.
(Moment
divided
by the constant
1000
is
used
in this handbook
to
simplify balance
calculations
by reducing
the
number
of digits.)
Center of Gravity
is the
point
at
which
an
airplane,
or
equipment, would
balance
if
suspended. Its distance
from
the
reference
datum
is
found by dividing the
total
moment by
the
total
weight of
the
airplane.
Revision 7
Summary of Contents for 172R
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