1. NSCC SEAMAN MODULE TWO SHIP’S STEERING AND SPEED CONTROL EQUIPMENT By ENS MATTHEW LANDRY, NSCC USS JOSEPH P KENNEDY, JR (DD 850) DIVISION FOR USE WITH CHAPTER 2, PAGES 2-5 TO 2-10 OF NAVEDTRA 14067

2. U. S. Naval Sea Cadet CorpsCOMPASS :: http://compass.seacadets.org/ Enabling Objectives Identify and explain the operation and usage of the ship’s steering and control equipment

3. U. S. Naval Sea Cadet CorpsCOMPASS :: http://compass.seacadets.org/ Steering Engines Two types of steering engines –Electromechanical (found on small ships, requires great maintenance) –Electrohydraulical (found on most current ships) Example: Single-ram electrohydraulical steering gear system

4. U. S. Naval Sea Cadet CorpsCOMPASS :: http://compass.seacadets.org/ How the Steering Engine Works Helm sends an electric signal to the receiving unit Mechanical signal sent to the running pump The running pump pumps oil (hydraulic fluid) into the port/starboard cylinder Ram forces the rudder to move in proper direction

5. U. S. Naval Sea Cadet CorpsCOMPASS :: http://compass.seacadets.org/ Emergency/Safety Steering Gear Electrohydraulic gear is provided with standby pumping unit Trick wheel (turn by hand) –Very slow –Rudder only turns small amount for each revolution of the wheel Rudder limits –Can only be turned 35° to either side of center –“FULL RUDDER” is only 30° –Extra 5 is used in emergencies –Never put the rudder hard over unless ordered – it can cause the rudder to jam against the stops!

6. U. S. Naval Sea Cadet CorpsCOMPASS :: http://compass.seacadets.org/ Rudder Angle Indicator Shows actual position of the rudder Directs emergency after steering during emergency –Use control knob to send orders to aft steering –Push button rings a bell to notify after steering of course change

7. U. S. Naval Sea Cadet CorpsCOMPASS :: http://compass.seacadets.org/ Engine Order Telegraph (EOT) Communicates speed orders to the engine room Ship with one engine has an EOT with one handle Ship with two engines has an EOT with two handles

8. U. S. Naval Sea Cadet CorpsCOMPASS :: http://compass.seacadets.org/ Engine Revolution Telegraph Also called the “propeller order indicator/transmitter” –Enables lee helmsman to make minor changes in speed –Shows revolutions per minute (RPM) of engine Located near the EOT Table of RPM per knot is posted nearby When not in use, ERT is set to “999” –Indicates ship is on “maneuvering bells” (EOT)