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Aviation History
1937
1937 - 1723.PDF
JUNE 24, 1937. FLIGHT. 645 The most powerful engine at Hatfield will be the eighteen-cylinder Alvis Alcides, which is claimed to deliver 1,700 h.p. for take-off. The respective capacities of these engines are 3,605 c.c. and 6,330 c.c., and their weights 210 lb. (approx.) and 325 lb. Both are air-cooled inverted four- cylinder in-line types and are character ised by their neat and compact appear ance. A particular point of interest is the type of cylinder used, this being designed to dispense with the usual long holding- down stud. It is machined from high- grade steel and located in the crankcase by spigots which are secured at their base by four short, stout bolts. Makers: The Cirrus-Hermes Engineer ing Co., Ltd., Brough Aerodrome, E Yorks. DE HAVILLAND.—The De Havil- land Aircraft Co., Ltd., are arranging to display a selection of engines and con trollable-pitch airscrews (see page 649) on Stand K. The engines will comprise the Gipsy Major Series II, and the Gipsy Six Series II, both intended for fixed-pitch or variable-pitch airscrews. In addition there will be sub-assemblies of the Gipsy Six Series II to show some of the features in which it differs from the familiar Gipsy Six Series I. These sub-assemblies will include the following:—a cylinder-head assembly; piston and connecting rod assembly ; the new crankshaft; a camshaft; a train of timing gears; the oil filters; and a cylinder. Makers: The De Havilland Aircraft Co., Ltd., Hatfield, Herts. NAPIER.—Included in the Napier exhibit on Stand G will be a Dagger E.108 " H "-shaped 24-cvlinder air-cooled engine. As this unit is still semi-secret full details and performance are not available. Certain important changes have been intro duced, the following being noticeable when comparing this engine with the standard Dagger III. Provision is made for a D.H. constant-speed airscrew; fin ning on cylinders and cvlinder heads has been improved , and the rear end of the engine, which has been entirely redesigned, incorporates a new supercharger and a re-arrangement of accessories. Like the standard Dagger, the E.108 is of 16.8- htres capacity. The airscrew shaft has been geared up above the centre line of the engine. A case displaying a representative selection of Rapier engine parts of standard workmanship and finish will also be shown. Makers: D. Napier and Son, Ltd.. 211, Acton Vale, London. POBJOY.—A completely cowled Niagara V engine, a partly erected crankcase, a crankshaft and connecting rod assembly will be on view on Stand N, reserved by Pobjoy Airmotors. A description of the new Niagara V, together with a power curve was published in Flight of June 17. This unit is par ticularly remarkable for the increased output as compared with its immediate predecessor, the Niagara III. Although sub stantially of the same size and weight the continuous cruising power of the Niagara V is rather better than the maxim inn output of the earlier engine. The bore is now 81 mm., the cruising r.p.m. 3,700, and the compression ratio 8:1. One hundred horse power is available for continuous cruising and the maximum power and speed are 130 h.p. at 4,400 r.p.m. Makers: Pobjoy Airmotors and Aircraft, Ltd., Rochester Aerodrome, Kent. ROLLS-ROYCE.—The high-light of the Rolls-Royce stand (H) will, of course, be the vee-twelve glvcol-cooled fully super charged Merlin now in quantity production for the R.A.F. This engine gives 990 h.p. at 12,000 ft.: the maximum output is 1,050 h.p., and the weight 1,318.5 lb. The Merlin will be shown fitted with one of the Rotol airscrews which operates on a system whereby the blade pitch is controlled by the difference between two oil pressures operating on each side of a piston the movement being communicated to the blades through links. These pressures are provided, and their difference adjusted, by, an engine-driven pump and governor unit. In addition to the Merlin, there will be the latest fully super charged Kestrel XVI as lately supplied to Yugoslavia and South Africa. This is also the power plant of the Miles private venture advanced trainer to be seen in the flying display. The XVI is the latest of the Kestrel Series and with a fixed pitch airscrew is rated at 690 h.p. at 2,600 r.p.m. at 11,000 ft., the maximum power being 745 h.p. at 3,000 r.p.m. at 14,500 ft. This unit has been cleared by type test for operation with a two position variable pitch airscrew, the oil control valve for the actuation of this unit being easily fitted. Makers: Rolls-Royce, Ltd., Derby. Supper Patrol The Cirrus Major 150, shown above, is fitted with a flame trap—but one of many accessories which are available. DAWN Patrols, which were, we believe, first organised and run by the Brooklands Club, become more and more popular, and it is natural, perhaps, that the originators should be the first to organise a variation in the same theme—to wit, a Supper Patrol. On Sunday, July 4, between 6 and 6.30 p.m., visitors are invited to make an attack on Brooklands, and, by way of a change from free breakfasts, a money voucher prize will be awarded to the pilots and passengers who are successful in eluding the defenders. - - •
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