Remote Control System

indicate the positions of the helm and rudders,

and the steering control system into one order to the

respectively. A helm-angle synchro transmitter, also

hydraulic pump.

mounted on the differential control box, actuates a

The stroking lever and output shaft on each

synchro receiver in the steering console in the

differential control box actuate a rotary servo valve

pilothouse. This receiver positions a pointer to

that controls the associated main pump on the power

indicate to the helmsman the angle that is ordered

unit. In response to movements transmitted through

rather than the actual rudder angle. The ordered angle

the control box, the pump discharge is varied between

is called the helm angle.

zero and maximum, and in either direction of flow.

Remote Control System

In normal steering from the pilothouse, a synchro

transmitter is turned by the steering wheel. This

The remote control system provides control

synchro transmitter is electrically connected to a

from the pilothouse for normal steering. This

synchro receiver in the steering gear room. The

system has a synchro transmitter mounted in the

synchro receiver is geared to the LOWER bevel gear

steering console and a synchro receiver mounted on

in the differential control unit, and its rotation is

each pump differential control box (port and

transmitted through gearing to a cylindrical cam. A

starboard). A cable selector switch in the pilothouse

follower roller, which engages a groove in the

and a similar switch in the steering compartment

cylindrical cam, is mounted on an arm keyed to the

permit a choice between the port or starboard

output shaft of the control box.

steering cables. The selection of the control cable is

made by the operation of the cable selector switches

For example, assume that the rudder is amidships

in the pilothouse and in the steering gear room to the

and it is desired to obtain 20 right rudder. The

desired (port or starboard) position.

rotation of the lower bevel gear causes rotation of the

cylindrical cam, which, in turn, imparts a motion to

The synchro-receiver selector switch in the

the servo control valve through the cam roller. This

steering gear room is then set to connect the synchro

motion of the servo control valve puts the pump on

receiver on the active power unit to the steering

stroke. Oil pressure is then applied in the port

console synchro transmitter. The rotary motion of the

cylinder, forcing the ram to starboard to give right

synchro receiver is transmitted through gearing to the

rudder.

input of the differential control box (stroking

mechanism previously described).

A rack, attached to the ram, rotates the follow-up

shaft, which is geared to the UPPER bevel gear in the

The helm-angle indicator synchro transmitters on

differential control unit. The movement of the ram

the differential control boxes in the steering gear

and rudders (in response to the stroking of the pump)

room are electrically connected to their associated

causes the upper bevel gear to rotate in a direction

steering-control synchro receivers. These transmit-

opposite to that of the lower bevel gear. This action

ters, under all conditions of operation, actuate their

rotates the cylindrical cam in the opposite direction,

associated helm-angle indicator synchro receivers in

tending to cancel the movement of the control input

the pilothouse console through their associated

and bring the servo control valve back to the neutral

cables.

position to return the pump stroke to neutral and stop

The 120-volt, single-phase power for the remote

the pumping of oil.

control system is supplied to the steering power panel

Thus, the rudders are at 20 right rudder, the cam

through a 450/120-volt transformer from the steering

is returned to neutral, and the pump is returned to zero

power transfer switchboard.

stroke until further movement of the steering wheel

The 120-volt, single-phase power for the

causes repetition of the cycle. The same sequence

indicator synchro transmitters is supplied from the IC

occurs if the control is from the trick wheel in the

switchboard.

steering compartment.

An engraved dial, graduated in rudder degrees, is

Magnetic Controller

mounted on top of the differential control box. Two

The motor of each steering gear pump is pro-

concentric pointers (one geared to the control pump

vided with a nonreversing across-the-line starter and a

input and the other geared to the rudder follow-up)

11-19