FlightGlobal.com
Home
Premium
Archive
Video
Images
Forum
Atlas
Blogs
Jobs
Shop
RSS
Email Newsletters
You are in:
Home
Aviation History
1919
1919 - 1652.PDF
ffi^ DECEMBER 25, 1919 bear the usual tribal names of Sunbeam-Coatalen aircraft engines and are of the following range of horse-power :— " Dyak," six-cylinder vertical, 100 h.p. ; " Manitou," twelve-cylinder " V," 300 h.p. ; " Matabele," 420 h.p. ; " Sikh," 800 h.p. All these engines are composed of similar materials for similar "parts, with one exception which will be noted later. The crankshafts are of nickel chrome steel, the pistons being of aluminium. The valves are of high chrome steel, of a special form and designed to withstand heat and prevent distortion, and the valve gearing is of self-hardened nickel chrome steel. The cylinder blocks, with the exception of the " Sikh " engine, are of aluminium casting with very large water circulation spaces and inspection covers. The cylinders are fitted with steel liners and the valve seats are of bronze. In the case of the " Sikh " engine, however, the cylinders are composed of steel throughout, and are welded together with their jackets. The crankcases are in each case of aluminium casting and are of a patent form, designed to give greater strength and to allow the bearing caps to take a large share-of the side load imposed on the crankshaft under the usual working stresses. All these engines are of the water-cooled type, the circulation being in each case by centrifugal pump designed to give a specially large output. Lubrication in all types is by gear wheel pumps, three of these being employed : («) A scavenger pump which draws the oil from the sump and returns it to the oil tank ; (b) the main force pump which forces oil through the drilled crankshafts and ducts in the crankwebs to the main bearings, drawing direct from the oil tank ; (c) the auxiliary oil circuit pump which forms a portion of the main force pump and is arranged to deliver the necessary quantity of oil at a very low pressure to the camshaft bearings and all auxihary bearings. Carburation is effected by Claudel Hobson carburettors of diffuser type working under a head or pressure of 4 lbs. per sq. in. Ignition is by high tension magnetos, and particulars as to the number of these are given in the details of each engine- The magneto drive is by a coupling formed of laminated spring blades giving great flexibility and ensuring a long life for the magneto. The "Dyak" "Manitou" and "Matabele" engines are each fitted with two sparking plugs per cylinder, the " Sikh " engine being fitted with four plugs per cylinder. Having considered the general characteristics of all the engines, we may now pass to the details more particularly applying to the individual engines. In the case of the " Dyak " 100 h.p. this engine is of the vertical type, the six cylinders being cast en bloc in aluminium, this casting being made in the Sunbeam Company's' own foundry and being one of the largest, if not the largest, yet made in this material. There are two valves to each cylinder, operated by one overhead camshaft which is driven direct by bevel gearing to the crankshaft. This is carried on seven die-cast white-metal bearings, and drives the propeller directly; the thrust bearing being mounted on an extension of the crankcase. The carburettor is of the B.Z.S. 38 type, and is arranged for gravity feed. The starting of this engine is effected by hand. The chief dimensions are as follow :— Bore .. .. .. .. 120 mm. Stroke .. .. .. 130 mm. Total stroke volume of cylin ders .. .. .. 8,820 «5 c.c. Normal speed of engine .. 1,200 r.p.m. Fuel consumption . . .. -54 pint per b.h.p. hour. Weight of engine " dry " .. 399 lbs. The " Manitou " 300 h.p. is a twelve-cylindered engine, <s> <s> Knighthoods for Australian Flyers JuST'as we go to Press we learn from the Air Ministry that H.M. the King has conferred the honour of Knighthood of the Order of the British Empire (Civil Division), upon Capt. Ross Smith, M.C, D.F.C, A.F.C., and his brother, Lieut. Keith Macpherson Smith, late R.A.F., in recognition of the valuable services rendered to aviation by their successful flight in the Vickers-Vimy-Rolls from England to Australia. The King has also approved of the award of a bar to their Air Force Medals to the two mechanics Sergt. W. H. Shiers, A.F.M., and Sergt. J. M. Bennett, A.F.M. General Seely's Successor MAJOR G. C. TRYON, MP., has been appointed Under- Secretary for Air in succession to Major-General the Right Hon. J. E. B. Seely, C.B., D.S.O., M.P., resigned. the cylinders being cast in blocks of three and disposed on the crankcase in two rows of six each, the angle of inclination being 6o°. There are two inlet and two exhaust valves actuated by overhead camshafts, these being driven by trains of gears from the crankshaft. The connecting rods are of the usual " H " section and of the articulated pattern. The hollow crankshaft is carried on eight die-cast white-metal bearings, and the propeller is driven indirectly by gearing to the propeller shaft which, with the thrust bearing, is mounted on an extension of the crankcase cast on the engine. Carburation is by two Claudel Hobson H.C. 7 carburettors arranged for gravity feed and set in the centre of the " Vee." The magnetos employed are two of the B.T.H. A.V.12 type, and these are driven from the trains of gears at one and a half times engine speed. Both electric and hand starters are fitted to this engine. The chief dimensions are as follow :— Bore .. .. .. .. no mm. Stroke * . . .. .. 135 mm. Total stroke volume .. 15,395 c.c. Normal speed of engine . . 2,000 r.p.m. Fuel consumption .. .. -54 pint per b.h.p. hour. Ratio of reduction . . 1 -57 to 1. Weight of engine " dry " . . 845 lbs. The " Matabele " 400 h.p. engine is similar to the " Mani tou " with regard to the general layout, the cylinders being similarly cast and disposed on the crankcase. The valves are likewise four in number (two inlet and two exhaust) and the valve gearing is exactly similar to that of the above- mentioned engine. The propeller drive is likewise indirect, the gear reduction ratio being in this case 1 -63 to 1. Carburation is by means of two Claudel Hobson H.C. 7 (twin type) carburettors ar ranged for gravity feed, and ignition is effected by means of four P.M. magnetos driven from the trains of gears. In this engine the starting is either by compressed air or by the hand starter. The chief dimensions are as follow :-— Bore . . . . . . . . 122 mm. Stroke .. .. .. 160 mm. Total stroke volume .. 22,429 cc. Normal revolutions . . .. 2,000 r.p.m. Fuel consumption .. . . -54 pint per b.h.p. hour. Weight of engine " dry " . . 1,000 lbs. The " Sikh ' engine as mentioned before, considerably differs from the other three. It has twelve separate steel cylinders machined all over, and welded together with their jackets, the disposition on the crankcase being the same as in the smaller twelve-cylindered type. There are three inlet and three exhaust valves to each cylinder, the method of valve gearing being by push rods and rockers actuated by a single central camshaft driven as usual from the trains of gears. Eight die-cast white-metal bearings carry the hollow crankshaft, and the propeller shaft is driven indirectly by spur gear, the thrust being mounted on an extension of the crankcase cast on the engine. Carburation is effected by means of four Sunbeam Claudel carburettors of special form, two being situated at each end of the engine. Ignition is by four twelve-cylindered magnetos driven by skew gear and fitted with Vernier type coupling to allow of fine adjustment. Both hand and electric starters are fitted to this engine. The chief dimensions are as follows :— Bore .. .. .. .. 180 mm. Stroke .. .. .. 210 mm. Total stroke volume .. . 64,113 -6 c.c. Normal speed of engine .. 1,400 r.p.m. Fuel consumption . . '.. -51 pint per b.h.p. hour. Ratio of reduction .. 1 -526 to 1. Weight of engine " dry " .. 1,952 lbs. <$> <$> Air Mail Service to Paris THE Postmaster-General announces that no air mail will be- despatched from London to Paris on December 25, 26 and 27. A Handley-Page at Warsaw THE Handley Page which Capt. E. D. C. Heme and Capt. Davis flew from London, safely reached Warsaw on Decem ber 20. The Caterham Fatality AT the inquest on Lieut. S. B. Bradley, the pilot of the machine which crashed at Caterham, the opinion was ex pressed that he was flying along the base of a cloud which pinched him lower and lower until he struck the tree on the top of a hill while trying to reach Kenley aerodrome. A verdict of accidental death was returned. 1654
Sign up to
Flight Digital Magazine
Flight Print Magazine
Airline Business Magazine
E-newsletters
RSS
Events
