Textron Cessna 172R - Cruise

CESSNA
MODEL
172R
SECTION
5
PERFORMANCE
Total distance
to
clear
a
50-foot
obstacle,
zero
wind
Decrease
in
total
distance
(2290
feet
X
13%)
2290
-298
Corrected
total distance
to
clear
50-foot
obstacle
1
992
Feet
CRUISE
The
cruising
altitude should be selected based
on
a
consideration
of
trip
length,
winds
aloft,
and
the
airplane's
performance.
A
typical
cruising
altitude
and
the
expected
wind
enroute
have
been
given
for
this
sample
problem.
However,
the
power
setting
selection
for
cruise
must
be
determined
based
on
several
considerations.
These include the
cruise
performance
characteristics
presented
in
Figure
5-8,
the
range
profile
chart
presented
in
Figure
5-9,
and the
endurance
profile
chart
presented
in
Figure
5-10.
The
relationship
between
power
and
range
is
illustrated
by
the
range
profile
chart.
Considerable
fuel
savings
and
longer
range
result when lower
power
settings
are
used.
For this
sample
problem,
a
cruise
power
of
approximately
65%
will
be used.
The cruise
performance
chart,
Figure
5-8,
is
entered
at
6000
feet
pressure
altitude
and
20°C
above
standard
temperature.
Thesel
values
most
nearly
correspond
to
the
planned
altitude
and
expected
temperature
conditions.
The
engine
speed
chosen
is
2200
RPM,
which
results
in
the
following:
Power
True
airspeed
Cruise
fuel flow
64%
1
09
Knots
7.3
GPH
Revision
7
5-5
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