-
CRUISE
PERFORMANCE
SKYHAWK
753
POWER
653
POWER
553
POWER
ALTITUDE
TAS
MPG
TAS
MPG
TAS
MPG
·
Sea Level
128
15. 4
121
16.8
111
17.3
4000
Feet
133
16.0
125
17.4
114
17.8
~
8000
Feet
138
16.6
129
17.9
117
18.3
:..
Standard
Cond}~ions
~
-- . .
Zero
Wmd
· ·
To
achieve the lean mixture fuei. consumption
figures
shown
in
Section
VI, the mixture should be leaned
as
fallows:
·'
(1)
Pull
the mixture control out .until engine.
RPM
peaks
and
begins
.
to
·
fall
-off.
· -
(2)
Enrichen slightly back to peak RPM.
For
best fuel economy
at
7_
5%
power
or
less,
operate
at
the
leanest
mixture that
results
in smooth engine
operation
or
at
50
RPM
on
the
lean
side of the peak RPM, whichever
occurs
first.
This
will
result
in
approxi·
mately
5%
greater
range than shown
in
this
mam~al.
Carburetor ice,
as
evidenced by
an
unexplained
drop
in
RPM,
can
be
removed
by
application of full
carburetor
heat.
Upon regaining
the
origi·
nal RPM (with heat off), use the minimum
amount
of
heat
(by trial
and
error)
to
prevent ice from forming. Since the
heated
air
causes a
richer
mixture, readjust the mixture setting when
carburetor
heat
is
to
be
used
con~inuously
in
~ruise
flight. . . .
The
use
of
full
carburetor
heat
is
recommended
during
flight
in
heavy
rain
to
avoid the possibility of engine stoppage
due
to
excessive
water
in·
gestion
or
carburetor
ice.
The mixture
setting
should
be
readjusted
for
smoothest operation.
In
extremely heavy
rain,
the
use
of
partial
carburetor
heat
(control
approximately
2/3
out), and
part
throttle
(closed
at
least
one inch),
may
2-16
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