4.16.4. Propeller, engine RPM
Shark easily increase speed when maneuvering. Careful power control
is required to avoid engine overrun. This is important for fixed
proppeler, but keep it in mind with electrically adjustable propeller as
well, because it takes about 12 seconds to change blade angles from
minimum to maximum. Therefore even in constant speed mode is
recommended to reduce RPM when maneuvering and work smoothly
with throttle. Best propeller is hydraulically controlled, as it react very
fast, and risk of engine overrun is minimal.
4.16.5. Flaps
At traffic pattern, after opening landing gear, at speed 130 km/h, is
recommended to reduce speed to 120 km/h and open flaps 1. Often
mistake is higher speed, or speed fluctuation caused by turbulence, or
incorrectly pressed button on control panel. Pressure switch,
incorporated to flaps control system, is adjusted to 130 km/h. Over this
speed flaps will not open, and in case they are already opened,
warning will be activated. Therefore is needed to prove if flaps are
really open.
Another risk associated with flaps is balked landing. Pilot often in stress
applies full power, and instead of climb transforms power to speed.
Flaps are designed for max. speed 140 km/h. Higher speeds can
cause structure overload.
4.16.6. Landing gear retraction
Pressure switch is incorporated to control system of landing gear. It
prevents retration below speed 115 km/h. It is recommended to keep
airplane in light climb, after take-off, and wait till speed increase
enough. Pilot can hold the switch for landing gear on, and wait till the
airplane reaches required speed. Then the landing gear retraction
sequence automaticly starts. It is recommended to check visually, if
retracting procedure started – lights blink, or if underarriage is really
retracted – 3 red lights on. Flight with opened landing gear is possible,
landing gear doors was tested up to 230 km/h.
4.16.7. Flutter, high altitude flights
Fast airplanes can have flutter issues. Problems can occur specially
during higher speeds in high altitudes, because critical flutter speed
decreases with higher altitude.
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