Leucht, P. and Mandley, D., "Telemetry Applications in the Rotary Combustion Engine," SAE Technical Paper 770877, 1977, doi:10.4271/770877.
This paper describes several applications of telemetry in making experimental measurements inside the rotary combustion engine. Short-range radio telemetry was used as the wireless data link from transducers on the moving rotor to the stationary housing of a firing engine. The procedures used to measure motion, temperature, and pressure in this difficult and hostile environment are described in detail. The problems encountered and the limitations of the measurement system are discussed in order to illustrate the application of this experimental method.