Abstract
The aerodynamic heating experienced by thermometers exposed from airplanes can be very nearly eliminated over a wide range of operating conditions by mounting the thermometer in the center of an air vortex created by a simple housing. This method has been found to simplify air temperature measurements over the operating range of a B-17 airplane. The instrument has promise for measuring temperatures in clouds. True air speeds can be measured by the difference between the temperature of the vortex thermometer and a thermometer exposed in the usual manner. Designs and flight data are presented for several vortex thermometers and a simple true air speed indicator.
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