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Aviation History
1937
1937 - 1731.PDF
JUNE 24, 1937. FLIGHT. 649 compression and. oil control rings, gudgeon pins and Aerolite pistons. The rings are manufactured from centrifugally cast iron to Air Ministry specification 4Kb. Rings in other irons will also be shown, particularly alloy irons of nickel-chromium and chro mium-molybdenum—to which the name Thermocrom has been given—the chief characteristics of which are high physical strength and ability to retain radial pressure at elevated temperatures with a good re covery value. Special types of oil control ring will be s^en, these having varying unit cylindei wall pressures depending upon the degree of control to be exercised. Gudgeon pins of all types are manufactured, a parti cular feature being the attention given to heat treatment. Aerolite pistons will, of course, be shown, and an interesting feature in the form of an elliptical piston skirt is introduced. This is designed to give con tinual parallel action of piston rings, irres pective of engine temperatures or- loads, thereby assisting the retention of maximum compression and predetermined oil control. Makers: The Light Production Co., Ltd., 60-66, Rochester Roiu. Westminster, S.W.i. LODGE (Stand 41).—Probably the most interesting exhibit on this stand will be the radio-screened plug which is supplied with 12 mm., 14 mm. and 18 mm. threads, vary ing in lengths of reach. This screened plug is completely opaque to electrical radiation and the screen forms an integral part of the plug. Two types of terminal assembly can be supplied, one for coupling to screened harness, conduit type, using ordinary insu lated cable, and the other with a coupling to take metal-braided cable. The connec tion to the high tension cable is easy to make and renew. In addition to screened plugs there will be a complete range of unscreened Lodge aviation plugs in the three standard thread sizes. The plugs shown will be those approved for all British aviation engines and most Continental and American engines. Makers: Lodge Plugs, Ltd., Rugby. JOHN MARSTON (Stand 59) .—Radiators and radiator parts will be shown by this firm, whose exhibit will also include oil coolers of the type recently evolved in con- A varied quartette of Wellworthy piston rings Akn ? K"'U1 the KAE- at F«nborough Also to be seen on this stand will be ail -Z,f /hrt metal work in •tantalum alloys and brass for use in cowlings and fainiigs, as well as machined parts, welded nttings and pressings. KC£r£X, (Stand 35)-In addition to the new S.P.9/6 magneto fitted with double con tact breaker and adaptor for screened har ness the S.P.8.8, the S.P.12/3, and a small single-cylinder rotating magnet magneto, Kotax, Ltd., will be exhibiting examples of the Kotax-Echpse direct cranking electric starter. These include the E.160.C com bined hand and electric type and the Y150B. direct cranking electric starter. The hand inertia starter will again be included, and it is probable that there will also be a new combined hand and electric starter. 1 hree sizes of generator will be on view, two types of which are available—the shunt wound model, used in conjunction with an external Tirrill type of regulator, and the Air Ministry pattern incorporating Sykes control field regulating system. Rotax and Rotax-Harley landing lights will also be exhibited, the latter for the first time since Rotax have taken over the, manufacturing rights, as well as Rotax type " B " and Nile batteries and numerous electrical details, such as switch boxes and transformers. Makers: Rotax, Ltd., Willesden Junction, London, N. IV. 10. SIMMS (Stand 70).—The range of aircraft magnetos to be shown by this concern will include a series of induction types for 9-, 12-, 14- and 18-cylinder engines, manufactured under R.B. licence. These machines are designed with a compensated cam for radial engines. Their light weight is a particular feature, a 14-cylinder screened model scaling only nj lb. Automatic advance is incorporated within the magneto. The Aero 1 (with 6-cylinder distributor) and the Aero 4 are of the rotating-magnet, fixed - winding type. Either of these machines can be supplied with or without impulse starter. The Simms SRM/6 mag neto and the C.S.6 type battery ignition and coils will also be shown. In the range of diesel equipment will be a Simms Uniflow 6-cylinder fuel pump and also a single- cylinder type, in section. Vernier couplings will be seen, as well as magnetic-type petrol gauges. Makers: Simms Motor Units, Ltd., Oak Lane, East Vinchley, London, N.2. TECALEMIT (Stand 29) will exhibit a new system of hydraulic power transmission by high-pressure rotary pumps and motors; oil filters (full flow) as standardised on Bristol and other makes of aero engine; diaphragm fuel pumps for lightweight aero engines; specialised lubricating systems for engines, controls, etc.; stabilisers for flying controls; automatic shut-off nozzles for safe, rapid re fuelling of aircraft; and quick-fix cap and seating for aircraft tanks. Other appropri ate products of the Company, not on show, include bulk oil filters for engine test beds; bulk petrol filters with de-aeration device; water filters; bulk oil and water heaters; portable manual and power refuelling pumps; air compressors; grease compressors and portable oil-draining apparatus. Makers: Tecalemit, Ltd., Great West Road, Brentford, Middlesex. VOKES (Stand 26).—This firm will dis play a selection of aircraft exhaust silencers operating on the venturi principle, for which they are well known. These will include the first silencer ever approved by the Air Ministry. This has an historical interest inasmuch as it passed all tests at P'arnborough, giving a reduction of 26 deci bels with extremely low back pressure of 65m. of mercury. Since 1934 the silencer has been considerably improved, and it is now possible to obtain a sound reduction of from 22-23 decibels with a back pressure of only o.sin. of mercury. At the same time the weight has been reduced from 30 to Z2 lb Air filters will also be exhibited with Photographs showing the fitting arnvnge- ments Latest developments will be illus trated by the panel-type design in which the Rotax 1,000-watt generator, as used on the Empire flying boats. filter is built into the engine cowling Various oil filters of the detachable head type will be exhibited, as well as the Pro- tectomotor air filter for ground equipment and panel air filters for cabin and building ventilation. By means of a working model the high dust se[iaration obtained by these air filters will be demonstrated. Makers: Voltes. Ltd., 95-103, Lower Rich mond Road, Putney, London, S.W.15. WELLWORTHY (Stand 36).-With the considerable increase in piston speeds ami the raising of pressures and temperatures, special material is becoming necessary lor the manufacture of piston rings. After re search in association with aero engine manu facturers this company produced a cast-iron alloy which seemed to meet all the require ments. This was designated Thermocrom and was duly patented and approved bv the Air Ministry. The principal claims foi this material are that it possesses the greatest strength and elasticity of any cast iron from which piston rings are made, and exceeds by at least 25 per cent, in tensile strength the normal piston ring material and gives a much slower rate of wear both on rings and wall. Within the limits of the Thermocrom specification it is possible to produce cast iron having tensile strength of 20 tons;sq. in. and upwards and a Brinell hardness figure of from 200 to 500. The Wellworthy exhibit will consist of a complete range oi gas and scraper rings manufactured by their patent process and supplied to the principal firms in the aircraft industry, including special type rings in stainless steel as well as those manufactured from the normal piston ring material and Thermocrom. Makers: Wellworthy Piston Rings. Ltd.. Stamford Road, Lymingion, Hants. Airscrews AIRSCREW CO. (Stand 82).—This com pany will exhibit its latest type ot three-blade airscrew with Schwarz detach able blades. The example on view is that designed for the Perseus VIH-engined \ il.le- beest. The diameter of this airscrew is 12ft. yet the weight is only 184 lb. 1 he steel hub is of unique design and weigtis little more than the standard hub which it replaces. The studs which hold the blades against centrifugal loads and so iorth aie preloaded to a figure depending on the con dition of maximum stress, and a special spanner is supplied to ensure that each stud is preloaded as near as possible to the same degree. A chart gives some idea ol the weight which can be saved by using wooden blades in association with variable-pitch hubs. As the main part of the blade is composed of softwood having a specific gravity of 0.5, and as the amount of com pressed wood remains constant for a given root size, the reduction of blade weight compared with other materials becomes greater as airscrew diameter increases, t-or a tip speed of 850ft. per second three-bladed airscrew root sizes are calculated as fol lows: 100 m.m. for 270-530 h.p.; 120 m.m. for 530-750 h.p.; 150 m.m. for 750-1,150 h.p.; 170 m.m. for 1,150-1,500 h.p.; and 190 m.m. for 1,500-1,800 h.p. Makers: The Airscrew Co., Ltd.. Wev- bridge, Surrey. DE HAVILLAND (Stand K).—The D.H c.p. airscrew exhibit will consist of seven
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