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INTRODUCTION
Performance
data
charts
on
the
following
pages
are
presented
so
that
you
may
know what
to
expect
from
the
airplane
under
various conditions,
and also, to
facilitate
the
planning
of
flights in detail
and
with
reasonable
accuracy.
The data
in
the
charts
has
been
computed
from
actual
flight
tests
with
the
airplane
and
engine
in
good
condition
and
using
average
piloting
techniques.
It
should
be
noted
that the performance information
presented
in
the
range
and endurance
profile charts allows for
45
minutes
reserve
fuel
at
the specified power setting. Fuel flow data for cruise
is
based
on
the
recommended lean
mixture setting.
Some
indeterminate variables
such
as
mixture leaning
technique,
fuel metering
characteristics, engine
and
propeller condition,
and
air turbulence may
account
for variations
of
107o
or more
in
range
and endurance.
Therefore,
it
is important
to
utilize all
available information
to
estimate the
fuel
required
for
the particular
flight.
USE OF PERFORMANCE CHARTS
Performance data
is
presented
in tabular or graphical form to illus-
trate
the
effect of different variables. Sufficiently detailed information is
provided in
the
tables
so
that conservative values
can
be
selected
andused
to
determine
the
particular performance figure with
reasonable accuracy.
SAMPLE
PROBLEM
The
following
sample
ftight
problem utilizes information from
the
various charts to determine the predicted performance
data
for
a
typical
flight.
The
following information is
known:
AIRPLANE CONFIGURATION
CESSNA
MODEL
172N
Takeoff weight
Usable fuel
TAKEOFF CONDITIONS
Field pressure altitude
Temperature
Wind
comPonent
along
Field length
1
July
1979
SECTION
5
PERFORMANCE
2300
Pounds
40
Gallons
1500
Feet
28'C (16'C above
standard)
runway
12
Knot Headwind
3500
Feet
5-3
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