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Aviation History
1959
1959 - 1597.PDF
flight, 5 June 1959 The History of E.A.T.O.3S this Oil set engine designers free! To forward their plans of producing increased thrust from aviation gas turbines of comparable size or even reduced frontal area—engine builders needed new metals, new alloys, new designs . . . and a new oil. ESSO AVIATION TURBO OIL 35 was introduced nearly 10 years ago. It is still the only lubricant on which all British turbojet and turboprop engines can develop and sustain full design performance wherever they fly. PERFORMANCE: E.A.T.O.35 is the only lubricant that fulfils every requirement in all turboprop and turbojet engines under all operational conditions in all British aircraft. Essential properties are maintained throughout its life, and E.A.T.O.35 is fully capable of withstanding maximum design temperatures. ECONOMY: E.A.T.O.35 has the lowest operational cost of all engine oils in airline use. It has solved the problems attending the storage of several oil grades, and has eliminated many other organisational problems in airline operation. It has extraordinary life in civil operation because it suffers little degradation in normal use. Repeated reclamation by filtering of used E.A.T.O.35—carried out by approved specialist firms—still further increases the economy of its employment. AVAILABILITY: Stocks of E.A.T.O.35 are maintained at all the major airports used by opera- tors of turbine-engined aircraft. This oil has been a consistent earner of foreign currency for Great Britain over a number of years, and it has been a factor in the sale of British aero engines oversea. pre-eminent in lubrication The History of E.A.T.O.35 Prime movers deserve prime place in the ten-year history of Esso Aviation Turbo Oil 35. But the account correctly begins in 1945, when Esso tech- nologists had decided that no petroleum-derived lubricant — however protected or bolstered by additives — could possibly embody all the diverse properties necessary for adequate lubrication of the developing gas turbine. Highest possible high-temperature viscosity and low- est possible low-temperature viscosity had to be combined with high load-carrying capacity and free- dom from corrosion — all in one lubricant. Successful Research Aircraft had to fly higher and fly faster. Designers of aviation gas turbines that have since earned respect throughout the world, made no secret of their inten- tion to exploit new alloys with superior strength at high temperatures. Engine-bearing temperatures, and axial and radial loads would of necessity be increased. Esso technicians at their establishment near Abing- don in Berkshire, concentrated their research on the thousands of possible esters, di-esters, and com- plex esters. The possibilities were narrowed to one formulation. The Esso European Laboratories pro- duct E.E.L.3—which became familiarly known as "Eeloil"—was launched in 1947. Ministry and Engine-builders' Approval Initial rig-testing of E.E.L.3 was carried out by Rolls- Royce, Armstrong-Siddeley, and Napier. Cold-start- ing tests of main engines were conducted on a Bristol Theseus at the Royal Aeronautical Establishment, Farnborough, and on de Havilland engines. Type- approval tests in an Armstrong-Siddeley Sapphire and in a Rolls-Royce Avon preceded flight work in Canberra bombers with Avon engines, operated by the Royal Air Force. On March 1,1952, the Ministry of Supply established specification D. Eng. R.D.2487: "Lubricating Oil— Aircraft Turbine Engine—Synthetic Type" against which only one oil, E.E.L.3, has been accepted. What was E.E.L.3 is now designated E.A.T.O.35; but since E.E.L.3 was introduced the situation has not radically changed. Throughout seven years, Esso synthetic oil has been the only one cleared for normal flight use in British civil and military aircraft. Available World-wide To rely on one oil that surpasses all others in perfor- mance is a distinct advantage, in that it eliminates the complicated storage arrangements, and the risks of error where more than one oil grade is employed. E.A.T.O.35 is available at every major airport used by British turbine-engined aircraft throughout the world. It has the lowest operational cost of all aero engine oils, suffers little degradation in airline use, and is reclaimable by filtration. Esso desire to acknowledge their dependence on guidance from advance information, and engine-test- ing facilities willingly provided by famous engine- builders. The enclosed colour representation of famous turboprop and turbojet engines which have placed British engineering prestige at the peak of world esteem, is printed as a tribute to them and in appreciation of co-operative progress. Flight in the 21st century is already the concern off Esso technologists Esso Petroleum Company Limited, 36 Queen Anne's Gate, London S.W 1 Aviation Technical Service, Telephone: RELiance 1261
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