Model RCA 15
The R.C. Allen Direction Gyro Model 15 "K" has been designed
with extended life and reliability foremost in mind. The design
incorporates high quality aluminum castings for the frame and gimbals.
All gimbal bearings are high grade permanently lubricated instrument
bearings, shielded against possible contamination and loss of lubrication.
As part of the assembly process, these bearings are aligned with
special tooling to assure minimum friction and proper control of
bearing endplay. The gyro motor operates on bearings of similar
quality properly preloaded to assure long life and smooth operation.
To insure maximum stability, the inner axis is aligned perpendicular
to the azimuth axis and maintained in that position by means of
an improved air torquing system. The air flow for this system is
supplied by a turbine pump which is integrally coupled with the
gyro motor and has no parts that can wear out. Position reference
of the azimuth gimbal is transmitted to the display card by means
of precision machined gears, thus minimizing friction and dither.
The heading adjust knob allows selection of the desired heading.
Upon depressing this knob the gyro inner axis is automatically aligned
perpendicular with the azimuth gimbal, thus assuring the most favorable
position for maximum stability. Although the gyro is available to
operate from 14 and 28 VDC all models have an AC (brushless) motor.
The DC versions have a hybrid inverter which converts the aircraft
DC power to the required voltage and frequency for motor operation.
A power failure flag drops into view whenever the supply voltage
is lost or when the voltage has dropped below a level of acceptable
for proper operation of the gyro.
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