Propeller Owner's Manual
140
DESCRIPTION AND OPERATION
61-00-40
Page 2-5
Rev.
2 Jun/12
(6) A governor control propeller is constructed and configured
as described for the manually controlled propeller
assembly with the following additions. Many engines on
which a governed propeller is mounted are not designed
with an accessory drive pad for attachment of a governor.
A device identified as a T-drive unit is installed between
the engine and the fuel pump to drive the subject
accessory and provide an additional accessory drive pad
for the attachment of a governor. Governor controlled
oil is supplied through external high pressure hosing to
a valve attached to the hydraulic cylinder and piston to
cause a blade angle change and maintain a constant
engine speed.
(7) Blade retention on early propeller models is designated
with
a "V
" in the propeller model.
The
"V" blade retention
type use
s
two shoulders on the blade root outside
diameter. The blade root shoulders are engaged by a
double shoulder blade clamp that encircles the blade root
and retains the blade onto a thrust bearing and blade
arm of the central hub. Blade retention on later propeller
models is designated with an "MV" in the propeller model.
This blade retention type uses a single shoulder on the
blade root outside diameter. A single shoulder blade
clamp encircles the blade root and retains the blade onto
a thrust bearing and blade arm of the central hub.
B. General Description (Forces)
While the propeller is operating, the following forces are
constantly present: 1) counterweight force, 2) centrifugal
twisting moment of each blade, and 3) blade aerodynamic
twisting forces. The counterweight forces rotate the blades to
higher blade angles, while the centrifugal twisting moment of
each blade is toward lower blade angle. Blade aerodynamic
twisting force is usually very small in relation to the other
forces and can attempt to increase or decrease blade angle.
Summary of Contents for HC-D2MV20-3 Series
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