Model RCA 26
The R.C. ALLEN Attitude Gyro Model 26 "k" incorporates
tremendous advances in presentation, precision, and reliability.
The attractive new extended color schemes and realistic spherical
display virtually obsolete any other attitude gyro. With the ultra-precise
spherical presentation, old parallax problems have been eliminated.
In this unit, R.C.Allen has combined the most recent technological
and human factors engineering concepts to produce the new standard
for safety. These gyros provide a more accurate IFR reference for
the beginning instrument pilot or a Cat II captain. A new three
phase motor/inverter is designed into the gyro enabling it to operate
at lower temperatures which extends to useful life. The instrument
employs a new, high precision air erection system which provide
erection torque for maintaining a proper vertical alignment reference.
The erection air is supplied by a turbine pump which is integrally
coupled with the gyro motor. Through maximum utilization of unitized
construction the design is free of resonant frequencies below 100
HZ and thus cannot respond to low frequency disturbances which can
cause dither and premature wear out of this unit. The display portion
of the instrument has a directly coupled roll movement, and a pitch
movement mechanism identical to that of the field proven vacuum
gyros produced by R.C.Allen since 1966. A "pull to cage"
spring type force limited mechanism assures immediate alignment
and stability whenever power has been applied to the gyro, a feature
non-existent on vacuum driven gyros. Although the gyro is available
to operate from 14 and 28 VDC all models have an AC (brushless)
motor. The artificial horizons 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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