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Aviation History
1936
1936 - 1718.PDF
JUNE 25, 1936. FLIGHT. 697 A " flying annexe " to the Static Show—the interior of the D.H. Dragon which carries more than fifty instruments, etc., marketed by Smith's Aircraft Instruments. In the foreground is the Standard radio compass. tyres and .hubs will be shown. These, being electrically conducting, permit.the safe, discharge of any electrical potential accumulated during a flight. Pneumatic and hydraulic aircraft brakes and various rubber parts, including the new Dunlop- illo cushioning, will also form part of the exhibit. Hydraulic brakes are primarily designed for use on light aeroplanes, while the pneumatic type is used where the pressures necessary are greater than can comfortably be exerted by a pilot. Makers: Dunlop Rubber Co., Ltd., Aero Section, St. James's House, St. James's Street, London, S.W.i'. PALMER (Stand 58).—Pioneers in the manufacture of special tyres for aircraft' use, this company will exhibit selections from their range of high and medium pressure equipment in both ordinary and streamline form. The latter have elimin ated the necessity for spats since the aerodynamic- efficiency is equal to that of an ordinary wheel when spatted. Practical demonstrations of their con ductive tail wheel, which employs elec trically conductive rubber, will also be' given. Examples of -the well-known Palmer brake will also be seen, the sim plicity of which is an outstanding fea ture, together with a complete' range of Palmer brake controls, with actual demonstration lay-outs, both pneumatic, and hydraulic types. These will employ various methods of application, both by pedal and by hand, and will show the automatic rudder-bar differential action. Makers: Palmer Tyre, Ltd., Thames House, Millbank, London, S.Wi.. Instruments and Controls LOCKHEED (Stand 36).—A very com prehensive array of hydraulic remote control pumps and valves, as well as shock absorber struts, will be shown by Automotive Products. Among the former will be included Aerodraulic jacks for such". features as retractable under carriages, flaps and bomb traps, elec trically operated position indicators and Aerodraulic . equipment for infinitely variable movement, consisting of a rotary transmitter, • five-way selector valve, position indicator, self-locking slave cylinders and electrical control for the position indicator. Various struts will be shown weighing from 21b. 120Z. in the case of a full cantilever oleo-pneu- niatic tail strut to 71b. 702. in the case of a pin-jointed strut for an aircraft weighing 4,0501b. Each is designed to take a landing velocity of about 12ft./sec. In addition, there will be a sectioned model arranged to show- its action. Makers: Automotive Products Co., Ltd.-: Tachbrook Road, Leamington Spa. EXACTOR (Stand 34).—This com pany, specialists in control systems, will be showing a sectioned mod«l of their well-known remote hydraulic control system which was invented by Dr. Hele- Shaw and Mr. Beacham, as well as a set of two standard engine control units which are the same in every respect as those installed in the Empire flying boats. Mounted in the same unit is an additional control for the operation of retracting landing lamps, which is in stalled so as to operate a remotely situ ated Harley lamp. This shows clearly the complete absence of backlash and the minute accuracy of operation. Ex actor controls will also introduce, for the first time, a remote engine priming sys tem, which allows a hydraulically oper ated primer to be situated on the engine itself. This ensures accurate injection of petrol and at the same time eliminates the necessity of taking the petrol into the pilot's cockpit. Makers: Exactor Control Co., Ltd., 18, Lower Regent Street, London, S.W.i. . HUGHES (Stand 24).—Since Smith's Aircraft Instruments are the sole agents for this company's aviation instruments as far as England is concerned, Smith's will be in control of the Hughes stand at Hatfield. Husun compasses are well- known to all pilots. Makers: Henry Hughes and Son, Ltd., Husun Works, New North Road, Barkingside, Ilford, KELVIN (Stand 10).—The Kollsman sensitive altimeter, which is now being manufactured by Kelvin, Bottomley and Baird, has been accepted as standard by virtually all Air Forces and transport concerns throughout the world. It may not be generally known that the sensi tivity is such that a difference in level of ten feet is clearly indicated. It has been adopted by the Royal Air Force and by Imperial Airways. _ The K.B.B. petrol level gauge for tanks, which will be shown, works on the principle of hydrostatic balance. The actual quan tity of petrol is shown on a simple pres sure gauge, which is operated by the air pressure required to force air to the bottom of the liquid. K.B.B. com passes are so well known that no detailed description is necessary. In addition to various aircraft models, a small landing compass will also be shown as well as an instrument with self-contained electric lighting on the Kollsman-K.B.B. System, which is absolutely "glare free." The Aldis signalling lamp is another well- known exhibit. It remains the standard signal lamp for both aircraft and aero drome equipment, though it may not be so well known that this lamp is almost equally efficient for daylight signalling. Another interesting instrument is the Vibrometer, which is used in the analysis of vibration such as is commonly experienced on aircraft. Makers: Kel vin, Bottomley and Baird, Ltd., Marlow House, Lloyd's Avenue, London, E.C.3. P. B. DEVIATOR (Stand 29).—Quite a number of machines have been, or are being, fitted with the P. B. automatic pilot, including the fleet of D.H.86As now being delivered to British Airways. This robot pilot, of course, will be the major exhibit. The three-axes equip ment comprises two separate apparatus, one to control the rudder and elevator, and the other the ailerons, their respec tive weights being 22lb. and i61b. The Deviator, whose axis of spin provides the basis of direction, is harnessed to relay valves which distribute pressure to the servo cylinders, which in turn operate the controls. The system is hydraulic throughout, using a light low-tempera ture oil which is not only rapid in action but also lubricates all the mechanism and so prevents wear and tear. The, com pany will also show a loin, model of their Deviator or stabilised gyro, demon strating its extreme simplicity of con struction and faithfulness of action, and a D.H. Puss Moth will be on the aero drome, fully equipped with a three-axes pilot. Makers: P. B. Deviator, Ltd., 42a, Sydenham Road, Croydon, Surrey. SHORT AND MASON (Stand /6).— This well-known company manufactures a number of extremely interesting pre cision instruments and testing apparatus. At Hatfield they will exhibit military and civil versions of their normal flight instruments, including Sestrel compasses of various types and Brown turn and bank indicators. There will also be a selection of testing apparatus for check ing and calibrating, and a number of meteorological instruments including a Micro-barograph, which, as its name implies, is an extremely sensitive atmospheric pressure recording device. Makers: Short and Mason, Ltd., Aneroid Works, Walthamstow, E.17.
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