Cessna 172 - Wing Flap Settings; Crosswind Take-Offs

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able small dents appear in the propeller blades, they should be immed' ?
ately corrected as described in Section V under propell~r care. l·
Prior to take-off · from fields above · 3000 feet elevation, the mixture
should be leaned to give maximum RPM · in a full-throttle, static runup,
. .
After full throttle · is applied, adjust the throttle friction lock clock- · 1
wise to prevent the throttle from creeping · back from a maximum power
position. Similar friction lock adjustments should be made as required in
other flight conditions to maintain a fixed t~rottle setting.
WING FLAP SETTINGS.
. Normal and obstacle clearance take-offs are performed with wing
flaps up. The use of 10° flaps will shorten the ground run approximately
10%, but this advantage is lost in the climb to a 50-foot obstacle. There·
fore, the use of 10° flaps is reserved for minimum ground runs or for
take-off from soft or rough fields. H 10° of flaps are used for minimum
ground runs, it is preferable to leave them extended rather than retract
them in the climb to the obstacle. In this case, use an obstacle clearance
speed of · 65 MPH. A.s soon a~ the obstacle ~s cleared, the paps ~ ni a y be
retracted as the aircraft accelerates to th _e normal flaps-up climb speed
of 80 to 90 MPH. · · · · · · · · I· • •
_ During a high altitude take-off in hot weather where climb would be
marginal with 10° flaps, it is recommended that the fl~ps not be used for
take-off. Flap settings greater than 10° are not recommended at any
time for take-off. . ....__
PERFORMANCE. CHARTS.
Consult the Take-Off Data chart in Section VI for take-off distances
under various gross weight, altitude, headwind temperature, and run·
way surface conditions. '
CROSSWIND TAKE-OFFS.
· Take-offs into strong crosswinds normally are performed with the
minimum flap setting necessary for the field length to minimize the
drift angle immediately after take-off. The aircraft is accelerated to a
speed slightly hfgher than normal, then pulled off abrvptly to prevent
possible settling back to the runway while drifting. When clear of the
ground, make a coordinated turn into the wind to correct for drift.
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