FlightGlobal.com
Home
Premium
Archive
Video
Images
Forum
Atlas
Blogs
Jobs
Shop
RSS
Email Newsletters
You are in:
Home
Aviation History
1934
1934 - 1217.PDF
NOVEMBER 15, 1934. FLIGHT. 1219 (Left) the Salmson A.D.9R. Series II, of 70 h.p. with the new enclosed valve gear, and (right) the Cirrus-Hermes IV of 120 h.p. BRITISH 6ALMS0N AERO ENGINES, LTD. FORMED to construct Salmson enginesin England, this company's most recent product is the A.D.9R type nine-cylinder radial rated at 70 h.p. Lately this engine has been produced with re-designed valve gear totally enclosed in oilproof boxes. This latter version isknown as the A.D.gR Series II. Its general specification is similar to that ofthe A.D.9R, which is a single-row radial with a single-throw crankshaft on rollerbearings. Overhead valves, operated through push-rods and tappets, the latterriding on the cam tracts driven through eccentric epicyclic gears, are utilised.One inlet and one exhaust valve to each cylinder are provided. Eight auxiliaryrods are articulated to a master rod with a solid white metal bearing. The Claudel Hobson carburetter isfitted at the rear of the engine with a specially arranged induction system, anddual ignition is provided by two nine- cylinder H.T. magnetos. The airscrew is driven through a 2:1 reduction gear.The whole reduction gear is a unit by itsell and may be withdrawn completewithout disturbing any other part of the engine. Lubrication is on the dry sumpprinciple with several special features. The engine is started either by handfrom the rear or by hand-started mag- netos. At cruising speed fuel consump-tion is from 4 to 4J gallons per hour, and oil consumption from 1.6 to 1.7pints per hour. CIRRUS-HERMES ENGINEERING CO., LTD. THE improved Cirrus-Hermes MarkIV A of 120 h.p. and the 70 h.p. " Cir- rus-Minor " are two of the latest productsof this company. The Hermes IVa is a four-cylinder inverted air-cooled typeweighing 300 1b. and delivering a maxi- mum power of 135 h.p. at 2,300 r.p.m.At cruising speed the engine consumes approximately 7 gallons of fuel per hour.Cylinders are of centrifugally cast iron, with detachable aluminium heads, andthe pistons are aluminium alloy castings. The connecting-rods are steel stampings with big-end bearings carried in steelshells. The "Cirrus-Minor" is quite a new type, giving a maximum of 80 h.p.at 2,400 r.p.m. The weight is ap- proximately 210 1b. Cylinder heads areattached to the cylinders by flanges and a spigot, and the usual long holding-down stud is absent. Pistons are of the slipper type, with connecting-rods ofHiduminium with steel-backed white- metal bearings. The crank case is avery neat casting with all the oil ways carried internallv. Housed in the crank case are two vertical magneto drivesfrom the crankshaft with spiral gears, the magnetos being of the spigoted type,with distributor pointing downwards. The breather is contained in the crankcase cover at the rear of the engine. Provision is made, in this engine, for anelectric starter. It is known that this company hascertain new types of aero engine at present under construction. Particularsof these, however, are not yet available for publication. THE DE HAVILLAND AIRCRAFT CO.. LTD. IT is probable that the " Gipsy " types,manufactured by this company, have broken more records than any otherseries of engines. There are five "Gipsy" types, the "Gipsy I"(100 h.p.), "Gipsy II" (120 h.p.), "GipsyIII" (120 h.p.), "Gipsy Major"(130 h.p.), and "Gipsy Six" (200 h.p.). The last three types are inverted engines,and the company is concentrating on the production of the " Gipsy Major" and"Gipsy Six." The "Gipsy Major" is a fonr-cylinder-in-line inverted air-cooled type using cylinders machined fromforged carbon steel billets, and cylinder heads of aluminium bronze with thevalve seats formed integral with the cylinder heads. Pistons are of the slippertype, cast from aluminium alloy, and the crankshaft is machined from a singleforging and carried on five plain bearings in a crank case also of aluminiumalloy. At full throttle (2,350 r.p.m.) the fuel consumption is 9.75 gallons perhour and oil consumption 1.25 pints per hour. " Gipsy " engines have six times been flown across the Atlantic, being theonly light aero engines to have done so. Virtually a six-cylinder version of the"Gipsy Major," the "Gipsy Six" is a more recent type, but has already dis-tinguished itself in service when fitted in such aircraft as the "Dragon Six,"and the four-engined D.H.89. 'n spite of 50 per cent, power increase the frontalarea is no greater than that of the " Gipsy Major," and the overall lengthis very little more than in the case of the four-cylinder type. The balance and
Sign up to
Flight Digital Magazine
Flight Print Magazine
Airline Business Magazine
E-newsletters
RSS
Events
