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

Страница: 85 / 306

Propeller Owner's Manual
115N
DESCRIPTION AND OPERATION
61-00-15
Page 2-25
Rev. 24 Dec/20
(5) Feathering governors allow oil to be pushed from the
propeller to the engine drain to increase propeller pitch
to feather.
(a) Some governors will move the propeller to feather
by electrically or mechanically actuating a valve that
opens to drain the oil supply between the propeller
and governor to increase propeller pitch and allow
the propeller to feather.
(b) Figure 2-8 illustrates another feathering propeller
governor system. When it is desired to feather the
propeller, the lift rod may be moved by the cockpit
control to mechanically engage the valve. The lifted
valve dumps oil to increase propeller pitch until the
propeller feathers.
(6) A synchronizing system can be employed in a
multi-engine aircraft to keep the engines operating
at the same RPM. A synchrophasing system not only
keeps the RPM of the engines consistent, but also
keeps the propeller blades in phase with each other.
Both synchronizing and synchrophasing systems serve
to reduce noise and vibration. Figure 2-9 illustrates
a governor as a component of a synchronizing or
synchrophasing system.
(a)
Hartzell Propeller Inc. synchronizing or
synchrophasing system uses one engine (the master
engine) as an RPM and phase reference and adjust
the RPM of the remaining engine(s) [slave engine(s)]
to match it. The RPM of the master engine is
monitored electronically, and this information is
used to adjust the voltage applied to the electrical
coil on the slave governor(s). The voltage to the
coil either raises or lowers a rod which changes the
force of the speeder spring. In this manner, engine
RPM and phase of the propellers is synchronized or
synchrophased.