Figure 5-2.-Emergency pitch arrangement.
system. Now there are two types of pitch indicating
OIL DISTRIBUTION BOX. On the DD-51 class
systems installed on the DDG-51 class ships. One
ships, the configuration of the oil distribution (OD)
system is temperature compensated while the other is
box has undergone several changes. First, the
electronic. Because these two systems operate
emergency pitch pump hose connections have been
independently, the DDG-51 class ships have both a
moved from the bottom of the OD box to the low
normal and alternate means of measuring propeller
pressure chamber cover, as shown in figure 5-2.
pitch. Let's take a brief look at both systems.
These changes make it easier for the operator to
make the connections during testing or in case of an
Temperature-Compensated Pitch Indicator
emergency.
System. On the DDG-class ships, the temperature-
compensated pitch scale platform is rigidly connected
Another
PITCH
INDICATING
SYSTEM.
to the OD box. The scale platform holds the feedback
significant change was made to the pitch indicating