PIPER
AIRCRAFT
CORPORATION
PA-28-161,
WARRIOR
II
4.25 CLIMB
SECTION 4
NORMAL
PROCEDURES
The best rate
of
climb at gross weight will
be
obtained
at
79
KIAS. The
best angle
of
climb may be obtained at
63
KIAS. At lighter
than
gross weight
these speeds are reduced somewhat.
For
climbing en route, a speed of
87
KIAS
is
recommended. This will produce better forward speed and in-
creased visibility over the nose during the climb.
When reaching the desired altitude, the electric fuel pump may be
turned off.
4.27 CRUISING
The cruising efficiency and speed
is
determined by many factors,
including power setting, altitude, temperature, loading and equipment
installed
in
the airplane.
The normal cruising power
is
55%
to 75% of the rated horsepower of the
engine. Airspeeds which· may
be
obtained
at
various altitudes and power
settings can be determined from the performance graphs provided by
Section
5.
Use
of
the mixture control
in
cruising flight significantly reduces fuel
consumption while reducing lead deposits when alternate fuels are used.
The mixture should be full rich when operating above 75% power, and
leaned during cruising operation when 75% power
or
less
is
being used.
To
lean the mixture for best power cruise performance place the
mixture control full forward and set the throttle slightly below (approxi-
mately
35
RPM)
the desired cruise power setting and lean the mixture to
peak
RPM.
Adjust the throttle, if necessary, for final
RPM
setting.
For
Best Economy cruise, a simplified leaning procedure which
consistently allows accurate achievement
of
best engine efficiency has been
developed. Best Economy Cruise performance
is
obtained with the throttle
fully open.
To
obtain a desired cruise power setting, set the throttle and
mixture control full forward, taking care not to exceed the engine speed
limitation, then begin leaning the mixture. The
RPM
will increase slightly
but will then begin
to
decrease. Continue leaning until the desired cruise
engine
RPM
is
reached. This will provide best fuel economy and maximum
miles per gallon for a given power setting. See following CAUTION when
using this procedure.
ISSUED: AUGUST 13, 1982
REVISED: OCTOBER 15, 1982
REPORT:
VB-1180
4-21
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