The Electric Firing and Indicating System122

The electrical systems connected with the operation of submarine torpedo tubes in reality present a separate study by themselves. While there naturally is similarity in these systems on different vessels, variations will be found. Hence, in order to secure accurate detailed information applicable to the electrical system in any particular submarine, it is necessary to refer to the plans, the General Information book, or to the Record of Electrical Auxiliaries, Volume 1, which are supplied to each vessel by the Bureau of Ships.

There are three electrical circuits directly related to the operation of the torpedo tube, with which it will be necessary for the student to become familiar when assigned to a submarine. These are the following:

1. The Torpedo Control Circuit (Circuit GA), which comprises the power and synchro circuits to the gyro setting indicator regulators, and to the depth setting indicators when these are installed. Torpedo data computers and gyro setting indicator regulators, including control units, are supplied by the Bureau of Ordnance.

2. The Torpedo Firing Circuit (Circuit 6PA), which comprises the means by which the firing solenoids, mounted at the tubes, are energized selectively from the firing stations in the control room or conning tower. Firing circuits are interrupted by switches on the

  battle order transmitters, and by the firing interlock switches at each torpedo tube.

3. The Torpedo Battle Order and Ready Light Circuit (Circuit 6R), which is the system that transmits the battle orders from the control room or the conning tower to the tubes, and indicates at those stations the state of readiness of the tubes. Gyro setting spindle retraction indicating switches, although an integral part of this system, have so far been supplied by the Bureau of Ordnance, by reason of their close association, physically and functionally, with the gyro setting tube units which are supplied by that Bureau.

The ready lights are supposed to indicate that the tube is ready to fire, and they should light when:

(a) The muzzle door is fully open.

(b) The depth and speed setting spindles are fully retracted from the sockets in the torpedo.

(c) The drains and vents are closed.

(d) The impulse stop valve is open.

(e) The interlock lever is set at "Tube Ready to Fire."

In some submarines there is no torpedo firing station in the control room, and, therefore, no connection to the torpedo firing circuit (Circuit 6PA). or to the torpedo battle order and ready light circuit (Circuit 6R).


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