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Aviation History
1952
1952 - 0378.PDF
RjcHf 8 FEBRUARY 1952 To prove that there is no foreseeable limit to the life of "Bristol" Hercules engines, a type test has just been carried out on a Hercules 634, built from a miscellaneous collection of old components most of which had already done over 3000 hours of service. Powers, fuel and oil consumptions were within the limits for a new engine. The Hercules 634 engine delivers 1690 B.H.P. for take-off, and is used in the Vickers "Viking" airliner. It has established beyond dispute the reputation of being one of the most reliable engines in the world. The Hercu/es 634 being removed from the dynamometer at the completion of this type test. AN UNUSUAL TYPE TEST MORE HERCULES ACHIEVEMENTS OVERHAUL LIFE EXTENDED TO IIOO HOURS Graph shows rate of increase of overhaul life of Hercules engines. I40O 2 APPROVED 3 4 5 SERVICE LIFE—YEARS OVERHAUL LIFE OF "BRISTOlT HERCULES ENGINES The period between overhauls of the Hercules 634 engines in Vikings operated by Airwork Ltd. has now been officially extended to 1200 hours, following the highly satisfactory condition of a trial batch of engines that had been operated for this period by Airwork. Thus a new step has been taken in the gradual process of extending the period between overhauls. Later marks of Hercules engines are now well on the way to repeating the excellent performance of the Hercules 630 series engines (see graph). THE AEROPLANE COMPANY LIMITED ENGLAND 99IE
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