Propeller Owner's Manual
136
DESCRIPTION AND OPERATION
61-00-36
Page 2-6
Rev. 2 Feb/17
1. Description of Propeller and Systems
A. General Operation and System Overview - Refer to Figure 2-2
(1) The propeller and control system provides constant speed
(RPM) control in flight and manually controlled positive
and reverse thrust for (slow speed) maneuvering.
(2) Major components consist of (1) a propeller, (2) a
governor, (3) a pressure control unit and (4) an oil
pressure gage. The (1) propeller attaches to the engine
to produce thrust for flight under constant speed (RPM)
control by a governor. The (2) governor installs on the
engine and controls blade angle through the supply or
drain of oil to the hydraulically controlled propeller for
constant speed (RPM) operation. The (3) pressure control
unit is used for propeller blade angle control in beta range
(low pitch to maximum reverse pitch). It also establishes
the maximum oil pressure available to the governor for
constant speed (RPM) control of propeller blade angle.
The (4) oil pressure gage monitors that the oil pressure
available to the governor is what it should be and has
not changed
(3) The propeller is compatible with a reciprocating engine
that will accommodate governor installation and
operation. The target engine type is generally unable to
accommodate the more common reversing propellers that
use a blade angle feedback system to a valve for position
control of blade angle in beta range (low pitch to maximum
reverse pitch). This propeller uses oil pressure control to
the propeller to manually control blade angle in beta range
for thrust control. The control concept is described as
pressure control reversing. This control concept does not
use blade angle feedback to a valve to facilitate propeller
blade angle control in beta range.
(4) The propeller may be used on a single engine fixed wing
amphibian aircraft for constant speed (RPM) control
in flight and manually controlled blade angle for water
maneuvering, docking, and undocking of the aircraft
in a waterborne environment. This propeller will not
accommodate reverse thrust use during landing to shorten
the landing distance.
