Two gover nors, a primar y gover nor and a
backup overspeed governor, control the pro-
peller rpm. The propeller control lever adjusts
the governor’s setting (1,600 to 1,900 rpm).
The overspeed governor will limit the pro-
peller to 1,976 rpm should the primary gov-
ernor malfunction. However, if the propeller
exceeds 6% above the selected rpm of the pri-
mary governor, usually the fuel topping gov-
ernor will limit the rpm by reducing engine
power. In the Ground Fine and Reverse ranges,
the fuel topping governor is reset to limit the
propeller rpm to 95% of selected rpm.
HARTZELL FOUR-BLADE
PROPELLERS
The C90GTi and C90GTx are equipped with
Hartzell 90-inch-diameter, four-blade, full-
reversing, dynamically balanced propellers.
The main advantages of the four-blade pro-
pellers are that they have lower tip speeds
(and thus generate less noise), create less air-
frame vibration, and provide generous pro-
p e l l e r t i p - t o - g r o u n d c l e a r a n c e . D y n a m i c
vibration absorbers mounted inside the cock-
pit and cabin (a total of 26 absorbers) are used
in conjunction with the four-blade propellers
to reduce noise and vibration even more.
BLADE ANGLE
Blade angle is the angle between the chord
of the propeller and the propeller’s plane of
rotation. Blade angle is different near the
hub than it is near the tip, due to the nor mal
twist which is incor porated in a blade to in-
crease its eff iciency. The propellers used on
the King Air C90GTi and C90GTx have a
blade angle that is measured at the chord,
30 inches out from the propeller’s center.
This position is refer red to as the “30-inch
station.” All blade angles given in this sec-
tion are approximate (Figure 7-33).
KING AIR C90GTi/C90GTx
PILOT TRAINING MANUAL
7-28
FOR TRAINING PURPOSES ONLY
7
POWERPLANT
BLADE ANGLES
PROPELLER
Figure 7-27. Blade Angle Diagram
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