1-21
Power Management
36.
Engine power management is accomplished by selecting an appropriate throttle setting
combined with an appropriate propeller RPM. Propeller RPM is set using the tachometer as the
reference instrument, while engine power (throttle) is set using Manifold Pressure (MAP) as the
reference instrument.
37.
Theoretically, there are infinite combinations of throttle and propeller settings that can be
used. In practice, power management is exercised using a limited number of propeller RPM
settings tailored for the specific regime of flight. Detailed power settings for Takeoff, Climb,
Cruise, Landing and Glider Towing are provided in
Part II
. These are established based on the
following considerations:
a.
Takeoff - during takeoff and initial climb, aircraft performance is optimized with the
blade angles at fine pitch / high RPM;
b.
Climb - after takeoff, the propeller speed can be decreased for noise abatement
reasons;
c.
Cruise - during cruise, performance is optimized by selecting coarser pitch and
thus reducing propeller RPM; and
d.
Landing - during landing, once power has been reduced below the minimum
governing condition, the propeller RPM is set FULL FINE as a precaution in case
of an overshoot.
38.
Power management also requires proper sequencing of engine and propeller controls,
specifically:
a.
when increasing power, adjust propeller RPM first, then apply throttle; and
b.
when reducing power, adjust throttle first, then adjust propeller RPM.
CAUTION
Do not exceed 20 inches MAP below 2250 RPM.
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