The RCA-11A series of vacuum directional gyros utilizes an air driven precision gyro that controls a vertical rotating azimuth gimbal. The R.C. Allen Model RCA11A has been designed to provide a long life of accurate operation even when subjected to severe operating requirements. This instrument is engineered with a minimum of machined parts, providing lower initial cost and lower maintenance cost throughout its lifetime.

The RCA11A is non-tumbling within +85° limits in pitch and roll and can be easily installed in any 3 ?? panel cut out. Full freedom design allows accurate indication, even after extreme maneuvers. Stainless steel is used at wear points, with aluminum investment and die castings.

A knob is provided to reset the gyro, when compared to the magnetic compass. The RCA11A-8 features RC Allen's "Standard" display.