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Aviation History
1938
1938 - 0670.PDF
244 FLIGHT. MARCH IO, 1938. \ THE INDUSTRY B.I.F. Echoes : D.H. Durability : Napier General Meeting : Cirrus-engitied Magisters : Coupling the Composite FINE FINISHES : The Titanine standwas one which added colour to the Castle Bromwich section of the British Industries Fair. Coolers at the B.I.F. A COMBINED radiator and oil cooler for a fighter which haslately been much in the news was among the exhibits on the stand of Serck Radiators, Ltd., at the British Industries Fair. Similar equipment for another famous fighter and also for an equally famous medium bomber is being supplied by the firm, which is also making cooling components for prototype aircraft. Experimental work is facilitated by means of a wind tunnel recently installed for the purpose. Experience in aircraft radiators enabled Serck to surmount the special problems involved in cooling Capt. Eyston's record- breaking cars, Thunderbolt and Speed of the Wind. The Serck Company's headquarters are at Warwick Road, Birmingham, n. After 1,000 HoursI N September last year, as the outcome of operating ex-perience with some 2,200 Gipsy Major engines, the De Havilland Company raised the recommended period be-tween overhauls from 750 to 1,000 hours, that is, about 100,000 air miles. To schools, and to commercial concernsoperating regular services, this was a considerable benefit, for it is often the practice to take an engine from one machinein for airframe overhaul and use it in another. To private owners it is more a proof of dependability, forwith many people a yearly overhaul is the rule, regardless of hours or condition. Recent facts collected during the examination of a GipsyMajor engine which haa completed its 1,000 hours with a school, tends to disprove the accepted idea that if somethingis not quite right in an engine it may continue to function for the whole period, but be a partial "write-off" at the end,whereas adjustment at 500 or so hours may save the part, or parts, involved. In the Major engine examined practically no parts calledfor rejection. Ground engineers reported that it was running well at 1,000 hours and that compression was satisfactory.No serious wear had occurred in any of the parts and, with a very few exceptions, they were accepted for reassembly. Tomention individual parts, it is stated that pistons showed no excess carbon deposit and all rings were free. Two exhaustvalves had undersized stems and one had a slight defect on the seating. Bearings were dimensionally satisfactory, butcertain of them had hair cracks in the white metal round the dowel pins. One cooling baffle was rejected for aworn hinge. One oil pipe nipple had been distorted by over-tightening. Amagneto rocker arm with bush and points was discarded, due to wear. Twosmall magneto ball bearings were scrapped through wear, and a carburet-tor tickler valve and knob needed re- newal. It is, of course, standard practiceon overhaul to replace packings, jointing washers and locking plates ; and, whetherthey are serviceable or not, exhaust-valve guides are scrapped on stripping. The 1,000-hour inter-overhaul period,it should be noted, applies to the Gipsy Major I engine and not to the new SeriesII unit, which operates under mnre try- ing conditions. A Desoutter AppointmentM R. HUGH BERGEL, who is a well-known member of the gliding community, is shortly joining Desoutter Bros., Ltd., as sales and advertising manager. Oil in the HurricaneF OLLOWING Sq. Ldr.. Gillan's high-speed flight in the Hawker Hurricane from Edinburgh to Northolt at 408.75 m.p.h.," Frank How and Co., Ltd., of Trogon Wharf, London, S.W.6, state that their "Trogon" aero oil was used in the Rolls-Royce Merlin engine. International Aircraft Directorship INTERNATIONAL Aircraft and Engineering, Ltd., of i- Barton Airport, Beds, state that Mr. H. F. Odroit and Mr. D. O. Summers have been appointed to the board. Statements by Sir" Charles Rose and Mr. W. J. Leeming that they (Sir Charles and Mr. Leeming) had resigned their director- ships were reported recently. Napier Developments " '"PHANKS in the main to Major Halford, who has been •*• responsible for designing the Rapier and Dagger en- gines which are now in service and giving every satisfaction, leeway has in large measure been made up." Thus Sir Harold Snagge, addressing the shareholders at the twenty-fourth ordinary general meeting of D. Napier and Son, Ltd., last week. He had been able to announce a greatly im- proved trading result—a profit of £58,172 for the year. "Apart from these engines," said Sir Harold, "we have in hand development work of great importance, in regard ,£0 which I am precluded from speaking with any precision, but upon which we have reason to build the highest hopes." The only Gipsy Major parts needing re- placement after 1,000 hours service
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