T-34C AIRCRAFT SYSTEMS FAMILIARIZATION
PROPELLER MAJOR COMPONENTS
The T-34C uses a three-bladed aluminum propeller. The propeller is hydraulically controlled,
constant-speed, full-feathering, and reversible. It measures 7 feet, 6 inches in diameter and
rotates clockwise. A spinner, bolted to the front flange at the propeller shaft, encloses the pitch-
change mechanism and helps to reduce drag.
The major components of the propeller are the blades, hub, and pitch change assembly. The
blades are attached to the hub, which is the central attaching point for all components. The
blades are installed into the hub, and the hub is then attached to the propeller shaft. The pitch
change assembly is comprised of the servo piston and connecting links, feathering spring and
retainer cup, counterweights, and beta feedback ring. All four components work together to
control prop blade angle, which is sometimes referred to as pitch.
Blade angle is the angle between the plane of rotation of the propeller and the chord line of the blade
(Figure 7-1). The T-34C has three basic blade angle stops (Figure 7-2).
Low pitch stop (idle)
Maximum beta (reverse)
Figure 7-1 Blade Angle