An investigation has been conducted in the NACA Cleveland icing research tunnel to determine the icing protection provided by external rubber-clad blade heaters at several icing, heating, and propeller operating conditions. Data are presented to show the effect of propeller speed, ambient-air temperature, liquid-water concentration, heating-power density, duration of heating, and total cycle times on the power requirements and de-icing performance of the blade heaters. A comparison is made of the results of the icing-tunnel investigation with the results obtained during a flight investigation in natural icing conditions. The maximum ice-covered area on the blade was determined and also the maximum heated area required.
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