Cessna Skyhawk Owner's Manual page 21

CRUISE & RA
NGE
Full-throttle
runups
over loose gravel are especially
harmful to
pro-
Gross
Weight-
2300
Lbs.
peller
tips.
When
take-offs
must
be made
over
a gravel surface, it is
standard conditions very important
that the thróttle
be advanced
slowly.
This allows
the
air-
PERFOR M A NCE
Zero Wind Lean Mixture
plane
to
start
rolling before
high
RPM is developed,
and
the
gravel will
SKYH AWK be blown back of
the
propeller rather
than
pulled into it.
When
unavoid-
able
small
dents appear in
the
propeller
blades,
they
should
be immedi-
NOTE: Moximum cruise is normolly limited
to 75% power. Cruise speed for sh.
ately corrected as described in Section IV under propeller care.
standard Model 172 is
approximately one MPH
Iess
than
shown
below
for
the
Skyhawk
configuration
Prior
to take-off
from fields above 5000 feet elevation,
the
mixture
311 GAL (NO
RESERVE)
48 GAL (NO
RESERVE)
should
be leaned
to
give maximum RPM in a full-throttle, static runup.
TAS GAL / ENDR. RANGE ENDR.
RANGE
WING
FLAP SETTINGS.
ALT. RPM % BHP
MPH HOUR HOURS MILES HOURS MILES
----------..-..-------.......
-.-........-..........-..
Normal and obstacle clearance
take-offs
are performed with wing
2500 2700 86 134
9.7 3.9
525 4.9 660
2600
79
129
8.6
4.4
570 5.6 720
flaps up. The use of
10°
flaps will shorten
the
ground run approximately
2500
72
123
7.8 4.9
600 6.2 760
10°/o,
but
this
advantage is lost in
the
climb
to
a 50-foot
obstacle.
There-
2400
65 117
7.2 5.3
620
6.7
780 fore,
the
use of
10°
flaps is reserved
for
minimum ground runs or for
take-off
from soft or rough
fields with no obstacles ahead.
5000
2700 82
134 9.0 4.2 565 5.3
710
If
10°
flaps are used for
a
minimum ground run (with no obstacles),
2600
75
128 8.1 4.7
600
5.9 760 the
flaps may be retracted
as
the
airplane accelerates
to the
normal
flaps-
25
62355 6 4
up climb speed of 80
to
90 MPH. When an obstacle is involved, use
the
2300
55
108 6.5 5.9 635 7.4 805
best
angle-of-climb
speed of approximately
65
MPH with
10°
of flaps.
2200
49
100 6.0 6.3
630
7.9 795
Also, it is preferable
to
leave
the
flaps extended rather
than
retract
them
in
the
climb
to the
obstacle.
As
soon as
the
obstacle is cleared,
the
flaps
7500 2700 78 133 8.4
4.5 600
5.7
755
may be retracted
as
the
airplane
accelerates to the
normal
flaps-up
climb
2600 71 127
7.7
4.9 625
6.2 790
speed. During
a high altitude
take-off
in hot weather
where
climb would
2500
64
121 7.1
5.3 645 6.7 810
be marginal with
10°
flaps, it is recommended
that the
flaps
not be used
40000 552
1
53 66.2
65 7 66
IOr
take-Off.
Flap settings
of
30°
to
40°
are not recommended
at any
time
for
take-
10,000
2650 70
129
7.6
5.0 640 6.3
810
Off.
2600
67 125 7.3 5.2 650 6.5 820
2500 61 118 6.9
5.5
655 7.0 830
PERFORMANCE CHARTS.
2400
55 110 6.4 5.9
650
7.5 825
2300 49
100 6.0 6.3 635
a.o
800
Consult
the
Take-Off
Data chart in Section
V for
take-off
distances
---- -.--- ---- -..--.
under
various gross weight,
altitude,
headwind,
temperature,
and
run-
12,500
2600 63 123
7.0
5.4 665 6.8 840
way surface
conditions.
2500 57 115
6. 6
5. 8 665 7. 3 835
2400 51 105
6.2
6.1 645 7.8 815
CROSSWIND
TAKE-OFFS.
Take-offs
into strong
crosswinds
normally are performed with
the
minimum flap setting necessary
for
the
field
length
to
minimize
the
Figure
5-4. drift angle
immediately
after
take-off.
The airplane is accelerated
to
5-4
2-9