Military Aircraft Propulsion Lubricants - Current and Future Trends
AIR FORCE WRIGHT AERONAUTICAL LABS WRIGHT-PATTERSON AFB OH AERO-PROPULSION LAB
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An assessment of the performance of MIL-L-7808J and MIL-L-23699C military Specification lubricating oils in turbine engines and helicopter gear boxes is presented along with predicted performance of current and upgraded military specification oils in advanced and growth engine designs. Data is presented on advanced ester base engine lubricants, corrosion inhibited engine oils, and separate helicopter gear box oils evolving from current developmental research efforts. Future high temperature candidate fluids representing the ultimate stability for turbine engine oils are also discusses. Their use, in most cases, entails engine design considerations to accommodate their unique properties. The advantages and disadvantages of the various classes of synthetic lubricants for turbine engine applications are discussed, and deficiencies are identified where additional research programs are needed.