Propeller Owner's Manual
136
DESCRIPTION AND OPERATION
61-00-36
Page 2-7
Rev. 2 Feb/17
(5) A second use for the propeller is on a lighter than air
vehicle such as a blimp. Constant speed (RPM) control
would be used during constant forward motion and
manually controlled blade angle for maneuvering when
close to the ground and during docking with a mooring
mast.
(6) The propeller will reach a high blade angle although it will
not feather (a higher blade angle) to accommodate the
possibility of an in-flight shutdown to prevent propeller
windmilling. This propeller is not intended for multiple
engine fixed wing aircraft although it is available for use
on lighter than air vehicles (blimps) with a single engine or
multiple engines.
(a)
Lighter than air vehicles float and do not depend on
forward speed and airflow over a wing to produce
lift. This results in an aircraft that does not require
feathering even though it utilizes multiple engines.
B. Propeller and Pressure Control Unit Features – Refer to
Figure 2-1 and Figure 2-2.
(1) Propeller
(a) The propeller uses a two piece aluminum hub that
retains each propeller blade on a blade retention
bearing which allows blade angle change during
propeller rotation on the engine shaft.
(b) A cylinder is attached to the hub and contains a
hydraulic piston and a spring set.
(c) The hydraulically actuated piston transmits linear
motion through a pitch change rod to a fork that
attaches to each blade through a pitch change knob
that is attached to each blade.
(d) The propeller attaches to the engine flange on the
end of the engine shaft
(e) The pressure control unit installs between the
engine and governor on the governor accessory pad
provided on the engine.
1 A drive extension must be installed for the
engine to drive the governor and permit
installation of the pressure control unit.
