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 TM 55-1905-242-14
0030 00
Steering With the Emergency Tiller (continued)
32
31
Steering With the Engines and Marine Transmissions
1.
To steer the vessel with the engines while underway:
a.
To turn the vessel to port, decrease the port engine speed while maintaining the starboard engine speed. The
turning rate will vary according to the difference in speed between the two engines. The greater the difference in
engine speed, the greater the turning rate. When the turn is completed, increase the speed of the port engine to that
of the starboard engine.
b.
To turn the vessel to starboard, decrease the starboard engine speed while maintaining the port engine speed. The
turning rate will vary according to the difference in speed between the two engines. The greater the difference in
engine speed, the greater the turning rate. When the turn is completed, increase the speed of the starboard engine
to that of the port engine.
2.
To steer with the marine transmissions:
! CAUTION
Always allow the engine speed to return to IDLE before shifting the marine transmis-
sions between AHEAD and ASTERN. Shifting the marine transmissions between
AHEAD and ASTERN at high engine speeds will cause serious internal damage to the
marine transmissions and can produce damaging shock loads to the other propulsion
machinery.
NOTE
If possible, the rudder should be positioned amidship when steering with the marine
transmissions.
a.
To turn the vessel to port, place the starboard propulsion control lever in the AHEAD position and the port
propulsion control lever in the ASTERN position. Engine speed can be varied to influence the turning rate, but the
engines must be permitted to return to IDLE before shifting the marine transmissions between AHEAD and ASTERN.
When the turn is complete, return both propulsion control levers to the NEUTRAL position and proceed with
underway operations.
b.
To turn the vessel to starboard, place the port propulsion control lever in the AHEAD position and the starboard
propulsion control lever in the ASTERN position. Engine speed can be varied to influence the turning rate, but the
engines must be permitted to return to IDLE before shifting the marine transmissions between AHEAD and ASTERN.
When the turn is complete, return both propulsion control levers to the NEUTRAL position and proceed with
underway operations.
0030 00-11
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