Hartzell HC-C2YR-4CF/FC8475-6, Руководство пользователя и журнал учета

Страница: 71 / 306

Propeller Owner's Manual
115N
DESCRIPTION AND OPERATION
61-00-15
Page 2-11
Rev. 24 Dec/20
D. Constant Speed, Counterweighted (Aerobatic)
Propellers ( )HC-( )( )Y( )-4( )
(1) Refer to Figure 2-3. The -4 Series propellers are
constant speed propellers in which blade mounted
counterweight forces act to move the blades to high
pitch. This model series is not equipped with an air
charge and does not feather. The blade centrifugal
twisting moment acts to move the blades to low blade
angle (low pitch), but the counterweights are large
enough to neutralize this force and produce a net
increase in blade angle. Oil pressure against a propeller
mounted hydraulic piston opposes the counterweight
forces to move the blades to low pitch.
(2) The action of the counterweights tends to move the
blades to a high blade angle (high pitch), reducing
engine RPM. Oil pressure toward low pitch increases
engine RPM.
(3) If oil pressure is lost at any time, the propeller will move
to high pitch to avoid overspeeding. Movement to high
pitch occurs because the blade counterweights are no
longer opposed by hydraulic oil pressure. The blade
counterweights are then free to increase blade pitch
toward the high pitch stop.