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TM 55-1905-223-24-9
i. Rudder Stocks. Identical port and starboard rudder stocks penetrate the main deck and the shell plating. Each
stock turns on three nylon bearings. The upper carrier bearing transfers shaft weight to the main deck foundation. The
rudder stock bearing is supported by inner and outer hull foundations which transfer steering loads to the ship's hull. The
lower bearing is located in the rudder shoe and provides secondary thrust support and lateral support. Each stock is in
two sections: an 8-inch diameter inboard section, and a 6-inch diameter outboard section. The sections are joined by a
bolted flange between the rudder and the hull.
(1) Rudders. The rudder is a 6-foot high flat plate with upper and lower horizontal fins plus two intermediate
fins. Fairings enclose the rudder post and mate with a rounded lead edge. The tapered profile measures 51 inches
across the top and 38 inches across the bottom.
(2) Rudder Shoe. The rudder shoes are port and starboard stern pieces providing support and protection to
the propellers and rudders. Each shoe supports the lower rudder bearing.
j. Emergency Hand Pump. The hand pump is a manually operated, reversible, positive displacement rotary pump
used for emergency steering. The pump displaces 5.94 cubic inches per revolution of the handwheel, which moves the
rudder 1.2 degrees. In the normal operating configuration, the hand pump and the associated header tank are isolated
from the system by two normally closed shutoff lockvalves.  During emergency steering, these valves open and
lockvalves in control manifolds A and B automatically close off the remainder of the system.
k. Header Tank. This tank is a 2 U.S. gallon fluid reservoir serving only the emergency hand pump. This tank is
mounted higher than the pump so that the pump is filled by gravity flow. The header tank serves the same function as
the main reservoirs, which are isolated by the lockvalves during emergency steering.
l. Model 306 Followup Transmitter. This unit is a mechanical/electrical device that continuously senses rudder
angles and sends electrical signals to the rudder angle indicators. The unit also provides the followup input to the
proportional steering logic. Port and starboard units are mounted to the ship structure outboard of each tiller arm. The
precise locations and the precise mechanical alignments with the tiller arms are established geometrically, to assure that
the transmitter shaft angle exactly duplicates the rudder angle. Inside each unit are two potentiometers that are gear
driven by the input shaft to produce these signals. See TM 55-1905-223-10 for details.
m. Rudder Angle Indicator, Model 202. The rudder angle indicator provides a remote display of actual rudder
angles. The indicator operates on electrical outputs from the followup transmitter.
Hulls 2008 and subsequent
Change 1


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