A silicone-diester blend (SD-17) was investigated in various bench studies and in a turbopropeller engine to determine its suitability as a lubricant for aircraft engines.nThe performance of the fluid was satisfactory during more than 17 hours of operation in a T-38 engine with power levels from 1745 to 2400 horsepower. The fluid has better viscometric properties than currently used lubricants and could eliminate low-temperature starting and pumpabiltLty problems for turbopropeller engines. The fluid has good boundary lubrication and other lubricant properties as measured with most bench devices. Especially good gear lubrication characteristics were established in bench studies and in the engine test.
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