and for all readout circuitry in the larger chassis. All power switches and line fuses are 
mounted on the power control panel. Plate power for all equipment is regulated by vacuum 
tube circuitry. Regulators are of standard TMB design with regulation for changes in line 
voltage or load. A switch panel and test set, located under the power control panel, provide 
a quick check on all console power supplies. 
6.2 MODEL EQUIPMENT 
All primary instrumentation power is supplied by the 400-cycle motor-alternator. The 
a-c power is applied to the individual units of the model equipment which have self-contained 
or separate power supplies. All major power supplies are commercial transistor-regulated 
units. The transistor-regulated supplies contain quick-blow internal-circuit fuses in addition 
to the panel fuses which are in the main line. Panel test points are provided for all regulated 
supplies to facilitate rapid location of defective units. The servo amplifier and error regulators 
have self-contained power supplies with silicon rectifiers and zener diode regulation. 
7. CONCLUSIONS 
The complete system has been tested in the laboratory and in several model ships. 
Individual sections of the system have undergone extensive laboratory tests and calibrations. 
The telemetering equipment has performed according to the manufacturer’s specifications as 
to linearity and stability. The special equipment such as the rudder servo, the powering 
equipment, and the special readout circuitry have performed as originally specified. The 
speed-load curves for the rudder servo in both modes of operation are shown in Figure 7. The 
servo was also checked with a programmed input, and servo followage was good up to the 
load-velocity limitations of the system. 
The propulsion powering system was checked with resistive loads and with motor loads 
in free-running and moored models. The motors used were 220-volt, 1/2-hp units, and were 
operated in normal and overload conditions. Complete tests with motors at full power were 
impossible since 3-hp motors and suitable dynamometers were not available. Motor drive 
voltage and model speed were checked during several straight runs at moderate speed on a 
single charge of the battery. Motor voltage held to better than 1 percent of the command value 
until the test was terminated when the battery charge was down to 0.8 volts per cell. Change 
in model speed was negligible and could probably be attributed to the effects of motor heating 
which are not compensated for in the feedback loop of the powering system. 
The performance of the radio frequency equipment at an RF output of about 2 watts was 
satisfactory for all model tests. The model was operated in the J-shaped turning basin with 
the control console located either on the towing carriage or at various points around the basin. 
The antennas were strapped to the carriage members or fastened to wooden pedestals when 
used on shore; they were placed at least 10 feet apart but no other precautions as to location 
I-12 
