| Summary: | The use of synthetic ester oils is presently an absolute necessity. Polyols ester type is the preferable synthetic lubricant to meet the demands of the lightweight gas turbine engine that used in civilian and military air crafts overcoming the lack ability of mineral lubricants. In this work, trimethylolpropanetributyrate, triheptanoate and trinonanoate esters were prepared using Dean Stark apparatus under specified optimum conditions verifying a conversion of 96.8–98.5% within 5.3–6.3 h. The esters were characterized by; i.r., elementary and average mean molecular weight determination, density, viscosity…etc. Some of their cordial properties were correlated to their chain length and some correlations were deduced. Comparison of these properties with the French Air specification 3514 (Nato 0–150) and those for the commercial turbonycoil 13B which is used for French aircrafts indicates that, some of the prepared esters are suitable as base turbine oils. These synthetic base oils may be blended with addition of the appropriate additives to produce final turbine oil for air crafts of speed regime coming towards supersonic. Keywords: Polyol esters, Turbine oils, Gas turbine engine oils, Ester based lubricant for air crafts
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