1.1.2 Battery Charger 
The battery charger should be located at a position allowing convenient access to 
the battery and the motor-generator and motor-alternator connectors of the model equipment. 
The charging and starting cables are approximately 20 feet long. The charger is designed for 
use on a 3-phase 600-volt power line. The maximum power requirement is approximately 
20 kilowatts. An auxiliary transformer is provided for operating the charger from 480 volt lines. 
The starting circuitry for the motor-alternator and motor-generator requires 115 volts at 
approximately 100 watts. 
1.2 MODEL EQUIPMENT 
The model equipment is composed of a group of small units which may be distributed 
about the model to obtain approximate model trim. Cable lengths have been arranged to permit 
considerable shifting of units when arranged in the following manner: The receiving antenna 
and receiver should be placed near the bow. These should be followed by the receiver and 
demodulator power unit and then the demodulator rack. The battery, the motor-alternator, and 
one or two motor-generators should be centrally located to permit the use of short leads in the 
high-current circuitry. The error regulator (s) may be mounted anywhere within cable range of 
the motor-generator(s). Location of the propulsion motor (s) will normally be determined by the 
position of the propulsion shaft(s). The RPM pickup(s) should be mounted on the intermediate 
propulsion shaft near the readout unit. The readout unit should normally be near the rear center 
of the model and may be placed above or between the propulsion shafts. The servo amplifier 
should be placed near the rear of the model and the servo unit placed directly over the rudder 
shaft. The transmitting antenna should be located as close to the stern of the model as 
possible and slightly higher than the rudder servo. 
All chassis should be securely fastened to the model and placed at least 1 inch above 
the bottom to prevent water damage. If the model is to be used in rough water tests, splash 
protection is required. 
Shock mounts are Provided for the motor-alternator and motor-generator units and should 
always be used to prevent transmission of vibration to the model and the electronic circuitry. 
The rudder servo may be used with or without the dynamometer attachments and may be 
used to control one or two rudders. When two rudders are used, the servo unit should be con- 
nected to the port rudder with the starboard rudder connected to the servo by the parallelogram- 
type linkage. NOTE: The zero rudder position should be set by shifting rudder shaft position 
or servo unit mounting position, but not by adjustment of shafts or gears within the servo unit. 
The weights of the model equipment units are shown in Table 2. The demodulator rack 
has spaces for two propulsion channel discriminators. When only one motor-generator is used, 
the discriminator for the unused channel may be removed and a blank panel substituted. The 
protective covers for several of the chassis may be removed where weight limits are extremely 
critical. The weights of typical systems, including cables, are listed in Table 1. 
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