MIL-P-15554 Revision B, November 9, 1961
PROPELLER REVOLUTION INDICATING EQUIPMENT,
Includes all amendments and changes through Interim Notice 1, April 22, 1998
Additional Comments: INACTIVE FOR NEW DESIGN AFTER 4/22/98
- This specification covers instantaneous, continuously indicating synchro electrical propeller revolution indicating equipment consisting of transmitters, indicator-transmitters, and indicators for use in Naval shipboard interior communication system, circuit "K".
- The transmitters shall be of types designated in the following form, as specified (see 6.1).
The type designations shall be in accordance with the following symbols:
IC/ - Basic indicator for Naval interior communication equipment. Speed ratio between propeller shaft and transmitter shaft:
1 - 1 to 1
2 - 2 to 1
3 - 3 to 1
Type of drive: (Method of driving the transmitter from the propeller shaft or propulsion equipment).
A - Gear drive
B - Direct coupling
Operating speed range: 0-400 r.p.m. unless otherwise specified. (see 6.1).
- The indicator shall be of types designated in the following form, as specified (see 6.1):
The type designations shall be in accordance with the followings symbols:
IC/ - Basic indicator for Naval interior communication equipment.
2 - 2 inches
4 - 4 inches
6 - 6 inches
B - Bulkhead
P - Panel
U - Universal
R - Red
W - White
N - No illumination
C - With counter
N - Without counter
2 - 0 to 200 r.p.m.
4 - 0 to 400 r.p.m.
- The indicator-transmitter, unless otherwise specified (see 6.1), shall be of the type designated in the following form:
A dash (-) shall be used to separate the major or basic features from the special features.
Special features shall include the number of scales on the dial and number of pointers, as follows (and such other special features as may be specified (see 6.1):
Symbol Feature X Single scale and pointer Y Single scale and two concentric pointers Z Two concentric scales and pointers