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Aviation History
1919
1919 - 0010.PDF
m CHT JANUARY 2, 1919 These passages in the intake headers are connected by two water outlet headers, the final outlet of which has an outside diameter of 2 in. The water pump is driven from a vertical shaft which takes its drive from the same vertical shaft that drives the camshaft driveshafts and the generator. Tnis shaft extends down ward and has a bevel gear which meshes with a bevel gear on the end of the pump shaft, thus accomplishing the drive. The vertical shaft extends downward and terminates in the oil pump, carrying the driving gear of the gear type of pump utilised for this purpose. Two duplex Zenith carburettors are used on the 12-cyl ndei" Liberty aircraft engine. This is equivalent to four single carburettors, each one supplying three cylinders ol the engine. Each duplex carburettor consists of a single float chamber and a single air inlet joined to two separate and distinct spray nozzles, ventun and idling devices. (As the V-type engine is, in a sense, two separate engines, ioined together for greater utility, so the Zenith is built in doub'e form for the purpose of supplying each one of these two engines with its exact re quirements.) Each of the two barrels of each carburettor is fitted with a throttle valve of the butterfly type. The shafts of the throttles are parallel with the centeriine of the engine, or " fore and aft," and arc interconnected by means of gear sectors pinned to the throttle shafts and meshing to gether. The two pairs of throttles are operated simultaneously by a shaft, provided with an adjustment at each end by means of which the pairs may be synchronised. Each duplex carburettor is fitted with an altitude adjustment which affects both barrels equally. Clearances Used in the Liberty Engine Minimum Maximum Desired Crankshaft— Diametrical clearance .. 0-0025 0-00325 End play .. .. 0-0575 0-0775 Connecting rods—• Forked end— Diametrical clearance End play Plain end— Diametrical clearance End play 0003 0-008 0-005 0-004 0004 o -020 0-0065 o -008 E E Restrictions on Manufacture Suspended THE Minister of Munitions has suspended until further notice—which means in effect permanently—the Aeroplanes (Experimental Manufacture) Order, 1917, and the Aero Engines (Experimental Construction) Order, 1918, which prohibited the experimental manufacture without a licence of any aeroplane, seaplane, or part thereof, or any aero engine. Experimental manufacture meant, it will be remembered, any manufacture not under Government contract, and included even the preparation of working drawings, but not of general arrangement drawings. The whole industry will be vastly relieved at the removal of these restrictions on its peace-time ac'ivities. Un doubtedly it was essential for the purposes of the War that experimental work of the kind indicated in the Orders should be restricted and the whole effort of the industry concentrated on war work. Now that the War is over and these reasons no longer enter into the calculation, it is satisfactory to know- that the Minister of Munitions is losing no time in removing the restrictions. Aluminium Orders Suspended THE Ministry of Munitions has suspended the operation of the following Orders :— The Aluminium Order, 1916, dated December 2nd, 1916. The Aluminium (Returns) Order, 1917, dated February 17th, 1917. The Aluminium (Scrap and Swarf) Order, 1917, dated February 28th, 1917. The Ministry has revoked as from the 31st ult. the Re fractory Materials (Max'mum Prices) Order, 1918, dated November 19th, 1918. Timber Restrictions Removed THE Board of Trade announce that as from January 1st, no permits will be required for dealing in timber of any kind in the"United Kingdom. As from the same date no permits will be required for buying, selling, or negotiating for the transport of hardwood timber, rattans, or Malacca canes outside the United Kingdom for deliverv to places aboad. Piston pin— Fit in rod Fit in piston Piston rings— Fit in grooves .. .. 0-00125 Gap . . . . . 0-021 Piston— Fit in cylinder .. 0-018 0022 Camshaft— Diametrical clearance- End play Camshaft upper driveshaft Diametrical clearance— Large bushing Small bushing End play Rocker levers— Diametrical clearance . , End play Valves— Fit of stems in guides- Diametrical clearance- Exhaust valve Inlet valve . . Water pump shaft— Diametrical clearance .. 0-0015 End play .. . . 0-006 Water pump bevel driver— Diametrical clearance .. o-ooi End play . . . . 0-005 Oil pump— Fit of gears in housing-— Diametrical clearance o-ooi Minimum Maximum Desired Select for -ooi . 0-00025 0-00125 clearance Select for light . 0-00025 0-00075 drive fit Loose Tight Top 0-003 '• Mid. and 0-003 Bot. 0-002 0-041 0-030 Select for 0-020 clearance o-ooi o 000 00005 o -0005 0-002 0-00025 o • 00; 0-004 0-002 0-004 Min. 0-002 0-0025 Min. 0-0015 0-0025 Min. 00015 0-008 Min. 0-004 0-00175 Min. o-ooi O-OTO 0-0075 o-oot>5 0-005 00045 0-003 o -0035 O -OIO 0-0025 0-008 Min. 0-0025 O-OIO End play Tappet gap— Exhaust valve . . Inlet valve Breaker gap Spark plug gap Regulator— Contact gap Height of pin .. 0-002 . . 0-019 . . o-ou . . o-oio . . 0-015 .. 0-005 •• 0-043 0 -007 0-021 0-016 0-013 0-015 0 -007 0-045 Select for 0-005 0-004 clearance Select for 0-007 0-003 clearance o-oic; E E The Export of Timber (Ireland) Order, 1917, and the Packing Case and Lapping Board Order, 1918, are also revoked. Mr. Bertram Jones Leaves the Air Ministry IN view of the Armistice, and pending demobilisation and the re-organisation of the Air Ministry which must follow, the Air Council have decided that the work entrusted to Mr. Bertram Jones, of reporting on the war system of provision, maintenance and issue of stores, should be dis continued. The Council have conveyed an expression of warm appreciation to Mr, Jones for his services, and for his great assistance, in an honorary capacity, to the Air Ministry, during the last year, in connection with the organisation of a Finance Division, and thereafter with questions arising in the Department of Equipment. More Possible Entries for the " Daily Mail " Prize ALTHOUGH definite entries have not yet been made, three more possible competitors for their trans-Atlantic prize have been mentioned by the Daily Mail. One is a Curtiss " Colossus " flying-boat, which may be piloted by a U.S. Navy pilot, another is Lieut.-Col. R. Collishaw, D.S.O.. a Canadian pilot, who proposes to use a five-engined Handley Page, and the third is Lieut. Pat. O'Brien, who has not dis closed what machine he proposes to use, but will have Capt. I. F. Fuller and Lieut. C. C. Robinson as his com panions. Food by Aeroplane IN certain districts in Northern France the inhabitants are having a somewhat parlous time owing to the fact that Germans in their retreat blew up roads and railway bridges, thus preventing supplies being sent up. The French Govern ment has now decided to utilise aeroplanes to carry the necessary provisions into the impoverished districts. French, British and American, as well as some of the German aero planes handed over under the Armistice agreement, will be utilised, and it is hoped that 70 tons of food will be con veyed daily. IO
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