Measurements made on the rotating components of aero-gas turbines are among the most difficult of instrumentation problems. Success brings considerable reward, however, by providing a means of verifying design predictions and investigating unforeseen phenomena. This paper describes the Rolls-Royce approach to this problem and the principles used in the design of over 30 radio telemetry systems designed and manufactured within the company. A summary of operating experience reviews the problems encountered and measures taken to overcome them. The paper concludes with an impression of future requirements which are receiving attention.

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