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Aviation History
1928
1928 - 0262.PDF
APRIL 5, 1928 BRISTOL "JUPITERS" FOR 1928-1929 DURING 1927 the Bristol Company successfully carried out an intensive development programme in the Engine Experi- mental and Research Department, with the object of increasing the range of " Jupiter " engines, and have now announced their programme of aero-engines for the ensuing years 1928- 1929, which will be as follows :— The well-known Series VI engine will be continued in its three compression ratios, but with detailed improvements of the cylinder components, which make them interchangeable with the geared and supercharged engines. This ungeared engine will be known as follows :—(a) Jupiter VI.A, 6-3:1 high compression engine, (b) Jupiter VJ.AM, 5-3 : 1 medium compression engine, (c) Jupiter VI.AL, 5-0: 1 low- compression commercial engine. The next series of engines will be the gear-driven super- charged engine. This will be known as Jupiter VII. The range of engines with the 2-1 reduction gear to the propeller will be known as follows :—(a) Jupiter VIII, 6-3:1 high compression engine, (b) Jupiter IX, 5-3 : 1 medium compression engine, (c) Jupiter XI, 5-0 : 1 low compression commercial engine. The following general particulars of the " Jupiter " engines may be of interest. In addition to the standard type, the " Jupiter " engine is now available fitted with a gear-driven supercharger, or with a reduction gear, making it suitable for all types of installations. The series VI .A consists of the well-known Series VI engine with a number of detailed modifications and improve- ments, as a result of the last three years' work. All these improvements are automatically incorporated in the new engines. The following are brief particulars of the various types ; the performances quoted are the guaranteed minimum figures under standard temperature and pressure conditions, and with Standard Air Ministry Service Fuel, 80 per cent. Shell avia- tion, plus 20 per cent, benzol. (1) Series VI.A. Standard Service Engine 6-3: 1 Com- pression Ratio.—Throttled on ground, 415 b.h.p. at 1,700 normal r.p.m. Rated at 5,000 ft., 415 b.h.p. at 1,700 r.p.m. Maximum permissible r.p.m., 1,870. (2) Series VI.A.M. General Purpose Engine 5-3 : 1 Com- pression Ratio.—Rated at ground level, 440 b.h.p. at 1,700 normal r.p.m. Maximum permissible r.p.m., 1,870. (3) Series VI.A.L. Commercial Engine 5: 1 Compression Ratio.—Rated at ground level, 420 b.h.p. at 1,700 normal r.p.m. Maximum permisible r.p.m., 1,870. (4) Series VII. (Gear Driven Supercharger). Standard Service Engine 5-3: 1.—Throttled on ground, 375 b.h.p. at 1775 normal r.p.m. Rated at 12,000 ft., 420 b.h.p. at 1,775 r.p.m. Maximum permissible r.p.m., 1,950. (5) Series VIII. (Reduction Gear 2 : 1 Ratio). Standard Service Engine 6-3: 1 Compression Ratio.—Throttled on ground to 410 b.h.p. at 2,000 normal engine r.p.m. Rated at 5,000 ft., 440 b.h.p. at 2,000 r.p.m. Maximum permissible engine r.p.m., 2,200. (6) Series IX. (Geared 2:1). General Purpose Engine 5-3:1 Compression Ratio.—Rated at ground level, 485 b.h.p. <$> <$> AIR MINISTRY NOTICES 1.—Reduction of Congestion on the 900-Metre Aircraft Wave. 2.—Position Reports 1. THE following instructions have been laid down in order to reducecongestion on the 900-metre aircraft wave :— • The pilot of an aircraft shall not(a) report the position of his aircraft to a ground station except when passing the specified reporting points or unless in need of assistance (b) ask the ground station for the wavelength of transmission from hisaircraft : in the event of such wavelength of transmission being incorrect, this fact will be automatically reported to the pilot by the ground station at thedeparture aerodrome (•-) ask the ground station for the time of his departure from that particularaerodrome. 2. The position reporting points for the Paris-Lyon-Marseilles air routedetailed in Notice to Airmen No. 8 of the year 1928 are amended to read as follows —Sens, Chalons sur Saone, Lyons, Valence, Avignon. No. 24 of 1928 Examination for Air Navigators As examination for 2nd Class Air Navigators licences will be held at theAir Ministry, Gwydyr House, Whitehall, on Monday and Tuesday, April lfi and 17, 1928. Application forms, the syllabi, and conditions of examination, may beobtained on application to the Secretary, Air Ministry (C.A.2), Gwydyr House, Whitehall, London, S.W.I. Formal applications to sit at this examination should be received at theabove address, and prospective candidates should give, with their at 2,000 normal engine r.p.m. Maximum permissible engine r.p.m., 2,200. (7) Series XI (Geared 2:1). Commercial Engine 5 : 1 Compression Ratio.—Rated at ground level, 460 b.h.p. at 2,000 normal engine r.p.m. Maximum permissible engine r.p.m., 2,200. During 1927 a certain amount of development work on the " Jupiter " was carried out. A brief resume of this work may be given as follows. An improved type of cylinder and piston, to cope with the increased r.p.m. of the geared and supercharged engines, has been very fully tested out on the single-cylinder test bed. The general design follows the well-known " Jupiter " cylinder construction, with additional cooling fins, and the incorporation of triple valve springs and ball-bearing rocker gear. The improvements have been included in the whole series, making them interchangeable as regards cylinder components. The supercharger as applied to the " Jupiter " VII has been developed to maintain ground level power to 12,000 ft., with an increase in weight due to the blower of only 40 lb. The gearing and drive for this blower has been the subject of most careful work, and before being released has been run for some thousands of hours on a specially designed test bed. This engine is specially intended for high performance scouts, and gives remarkable improvement on the perform- ance at altitude, the improvement over the Series VI on similar machines being over 20 per cent, on climb and 10 per cent, on speed. A valuable feature in connection with the design of the Series VII. supercharged engine is that it is interchangeable as regards installation with the Series VI.A. engine. The Bristol Company have acquired the patent rights for Great Britain for the well-known Farman bevel-reduction gear, and this gear has been applied to the " Jupiter " engine with considerable success. Hundreds of hours' running have been undertaken on the test bench, and some eight different types of machines fitted with these engines have been tested out with excellent results both as regards engine and machine performance. The gear as applied to the " Jupiter " engine has proved very robust, efficient and silent. Very extensive flight tests have been carried out and detailed improvements made to the Bristol triplex carburet- tor, to cope with the increased speed of the geared and super- charged engines. The increased engine r.p.m. on the various engines has necessitated modifications to the earlier types of ring, and extensive tests have been undertaken. As a result an entirely new design of ring has been produced, in which back pressure has been reduced to under \ lb. per sq. in., and the ring temperatures brought down to an absolutely safe limit. The types of rmgs are at present available, one for the Series VI.A. ungeared engines and one for the geared engines ; both these rings have been type-tested and are in pro- duction. applications, full details of any qualifications and experience they already possess. Before a licence can be issued, candidates will have to pass a medical examination at the Central Medical Board, 5-6, Clement's Inn, London, W.C.2. Arrangements can be made for this examination to take place on April 18, 1928. if candidates make early application to be examined on that day. PERSONALS Married CAPTAIN GUY VICTOR LEATHER, late R.N.A.S., younger son of Col. GerardLeather and Mrs. Leather, of Middleton Hall, Belford, Northumberland, was married on February 21, at Christ Church, Pietersburg, Northern Trans- vaal, to LORNA MATHEW, daughter of Mr. and Mrs. NORMAN HARLF.Y, ofPietersburg. To be MarriedThe engagement is announced between JACK HADDEN, Black Watch, seconded R.A.F., youngest son of the late Frank J. Hadden, of Hunugalla,Ceylon, and of Mrs. Hadden, 17, Empire House, Thurloe Place. S.W., and CAROLINE MARY (CAROL), younger daughter of CHARLES FARQUHAR, IndianPolice (retired), and Mrs. Farquhar, of Craiglarach, Aboyne. A marriage has been arranged between JOHN MACLAREN PEARSON, lateCameronians and R.F.C., second son of the late C. J. B. Pearson and Mrs. Pearson, and BETTINE MARIE HAMILTON, elder daughter of Maj. CYRIL andMrs. POTTED, Blakes, Lymington, Hants. The engagement is announced between FLYING-OFFICER J. S. PHILLIPS,R.A.F., elder son of the Rev. P. R. Phillips and Mrs. Phillips, of Hildersham Rectory, Cambridge, and Miss NANCY CROFT, of Meadham, Harlow, Essex,third daughter of the late Sir Archer Croft, Bt., of Croft Castle, Hereford- shire. 234
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