Cessna 152 - Page 13

CESSNA
MODEL
152
SECTION
1
GENERAL
ENGINE
POWER
TERMINOLOGY
BHP
RPM
Static
RPM
Brake
Horsepower
is
the
power
developed
by
the
engine.
Revolutions
Per
Minute
is
engine
speed.
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
Demon-
strated
Crosswind
Velocity
Usable
Fuel
Unusable
Fuel
GPH
NMPG
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.
Gallons
Per
Hour
is
the
amount
of
fuel
(in
gallons)
consumed
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
g
is
acceleration
due
to
gravity.
WEIGHT
AND
BALANCE
TERMINOLOGY
Reference
Datum
Station
Arm
Moment
~.July
1978
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
1-7