CESSNA GENERAL
MODEL 152
1 July 1978 1-7
ENGINE POWER TERMINOLOGY
BHP Brake Horsepower is the power developed by the engine
RPM Revolutions per minute is the engine speed
Static
RPM
Static RPM is engine speed attained during a full-throttle
engine runup when the airplane is on the ground and
stationary.
AIRPLANE PERFORMANCE AND FLIGHT PLANNING TERMINOLOGY
Demonstrated
Crosswind
Velocity
Demonstrated Crosswind Velocity is the velocity of the
crosswind component for which adequate control of the
airplane during takeoff and landing was actually demonstrated
during certification tests. The value shown is not considered
to be limiting.
Usable Fuel Usable Fuel is the fuel available for flight planning
Unusable
Fuel
Unusable Fuel is the quantity of fuel that can not be safely
used in flight
GPH Gallons per Hour is the amount of fuel (in gallons) consumed
per hour.
NMPG Nautical Miles per Gallon is the distance (in nautical miles)
which can be expected per gallon of fuel consumed at a
specific power setting and / or flight configuration.
g g is acceleration due to gravity
WEIGHT AND BALANCE TERMINOLOGY
Reference
Datum
Reference Datum
is an imaginary plane from which all
horizontal distances are measured for balance purposes
Station Station is a location along the airplane fuselage given in terms
of the distance from the reference datum.
Arm Arm is the horizontal distance from the reference datum to the
center of gravity (C.G.) of an item
Moment 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).
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