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CESSNA
MODELT210M
SECTION
1
GENERAL
AIRPLANE PERFORMANCE AND FLIGHT PLANNING
TERMINOLOGY
Demon-
strated
Crosswind
Velocity
Usable
Fuel
Unusable
Fuel
PPH
NMPG
g
Demonstrated Crosswind Velocity
is the velocity
of the
crosswind component for which adequate control of the
airplane
during takeoff and landing
was actually
demon-
strated during certification
tests.
The
value
shown is not
considered
to
be
limiting.
Usable Fuel is the fuel
available
for flight planning.
Unusable Fuel is
the
quantity of fuel that
can
not be
safely
used in
flight.
Pounds Per Hour is
the amount'
of fuel
(in
pounds)
con-
sumed per hour.
Nautical Miles Per
Gallon
is the distance (in
nautical
miles) which
can be expected per gallon
of
fuel consumed
at a specific
engine
power setting and/
or
flight configura-
tion.
g
is acceleration due to gravity.
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WEIGHT AND
BALANCE
TERMINOLOGY
Reference
Datum
Station
Arm
Moment
Center
of
Gravity
(C.G.)
Reference
Datum is an imaginary vertical plane
from
which
all horizontal distances are measured for balance
purposes.
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 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
reduc-
ing 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.
1-7
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