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Aviation History
1960
1960 - 2260.PDF
CABIN AIR INTAKE 594 FLIGHT, 7 October 1960 PRESSURE SWITCH PORT — CHOKE VALVE S CABIN AIR NTAKE SPILL VALVE CHOKE VALVE- FOLLOW-UP RESISTOR H ACTUATOR Schematic diagram of Teddington Controls' simplified cabin temperature-control system (see first news item below) The Industry Simple Cabin Temperature Control OELECTION of required cabin heat on a single dial, with all^ further action being controlled automatically, is a feature of Teddington Controls' new simplified cabin temperature controlsystem. Designed for layouts with several control valves, it has been evolved as an inexpensive and lightweight installation. In the diagram—a four-valve air conditioning system—theblower supplies air to the primary heat exchanger via the choke heating valve and the silencer. When the valve is in the maximumchoke position, temperature is at a maximum. Cooling is achieved by passing ram air over the heat exchanger, flow being controlledby gills. Choke valves and gills are controlled manually by adjustingthe temperature selector; potentiometric valve positioning is applied to each basic valve unit. Actuators are switched by adouble-pole relay operated by the twin-transistor circuit of a four- channel controller. The function of the pressure switch, con-nected across the blower, is to prevent excessive blower pressures resulting from actuation of the choke valve. On pressure rising,two changeover switches are operated consecutively, firstly to cut off the choke valve supply and then, at the higher setting,to open the valve. Something New in Aircraft Heating A MODEST first foothold in the aircraft field has recently**• been gained by a process manufactured by the Camberley, Surrey, firm of Inferation. Commercial producers of convectorc'.othes dryers and electrically heated skirting boards, Inferation have applied fundamentals of the same heating techniques tocockpit floor warming mats, food and beverage containers and aircraft skin-de-icing. Some remarkable claims have been made for what is clearlya versatile system. Perhaps the most significant is that loading can be varied from one-sixth of a Watt per square inch up to50W/sq in, and that the variation can take place in the same continuous element over a very short distance. Thus for de-icingapplications an intense 35W/sq in loading can be evenly graduated over a few inches down to 4W. It is said, moreover,that the Inferation system is cheaper, lighter and more economical than any other known type of electric de-icing system. Comet cockpit floor mat by the Inferation Co; electrical load- ing 36W The element can be pierced if necessary without breaking thecircuit, although edges of holes must naturally be protected. There is no practical limit to size (there has been an inquiry foran element 60ft long and 2ft wide) and thickness can be adjusted over a fairly wide range upwards from 0.04in. The system is described as an insulated, electric, plasticelement in which carbon is used as the base material. Carbon has a negative temperature coefficient on its own, but in theInferation process it is pulverized to a flour and each finely divided particle is silver plated by a special process which is also coveredby patent. The silverized carbon is then incorporated in micro- scopic layers on an insulated base, this base and outer glasscloth coverings being plasticized by chemical changes by catalyzed GILL H SPILL' VALVE FOLLOW-UP RESISTOR FOLLOW-UPi RESISTOR FOLLOW-UP RESISTOR \ r TRANSISTORISED CONTROL UNITI I I TEMPERATURE SELECTOR resins under heat and pressure, and transformed into an homo-genous material. The resulting element is fully insulated, water- proof, and rigid or semi-flexible as required. Because of thetype of construction employed it can be moulded into any desired shape, including that of a tube, and in general it is applied to anyinterior or exterior surface by bonding. It has been suggested that it could be efficiently used by bonding it to the inside ofthe leading edge skin of a wing, intake duct or helicopter rotor blade. This would overcome erosion problems completely butfor less severe application there is no reason why the Inferation element should not be used on an exterior surface. One application already in service is flight crew mats for theDart Herald and Comet. In this case the mat is insulated with a layer of fireproof rigid foam. Another application is in galleyhot-food containers. Here the efficiency of the system is claimed to be such that only 80W is required to perform a task normallyrequiring up to 200W. There is also said to be a considerable saving in weight. The Inferation Co was formed in 1953 todevelop this type of element and to manufacture and market products incorporating it. An aircraft division has been formedat the works on the Yorktown Industrial Estate in Camberley. The aeronautical consultant is Gp Capt Hamish Mahaddie. IN BRIEF Mr R. F. Bond has joined de Havilland Propellers as parts salesmanager. He comes to the company after 14£ years with BOAC, where for the last seven years he has been concerned with the sale ofsurplus aircraft and spares. The telephone number of the Lancashire Aircraft Company's factoryat Samlesbury Airfield has been changed from Blackburn 44668 to Mellor 666. Known as Tesakrepp 322, a new type of masking tape is being madeby Metemicals (Cannon) Ltd, 60 Cheapside, London EC2. The tape, which resists temperatures of up to 175 °F can, it is stated, be stretchedto at least a third longer than its normal length. Industrial Acoustics Co Ltd, manufacturers of jet noise suppressionequipment and other noise-control products, have moved from London Wl to Victor House, Norris Road, High Street, Staines, Middx (Staines55400; cables, Indcoustic, Staines). Mercury Airfield Equipment Ltd, of Gloucester, have been appointedsole UK and Eire distributors for Sicard Inc, of Montreal. Over 200 Sicard SW.112 high-speed airport sweepers, it is stated, are in use inthe US and Canada. These units not only sweep snow, slush, sand, etc., but can clear runways of loose objects up to 21b in weight. Hepworth & Grandage Ltd, manufacturers of engine components,have bought a 22-acre site at Southwick, Sunderland, and will begin the first phase of factory construction there early next year. This newplant will ease present production pressure at their 26-acre main Brad- ford works, which is itself in process of being extended and modernized. Amplivox Ltd, Wembley, Middlesex, announce the appointment ofA. R. Bolton & Co Ltd, Sighthill, Edinburgh 11, as their sales repre- sentatives for Scotland. From their new factory in Sighthill A. R. Boltonwill handle the products of the Amplivox Industrial Division, including headsets, headphones, microphones, earphones, ear defenders andtransistorized communication systems. Southern Instruments Ltd, of Camberley, Surrey, have receivedthrough their Italian agents an order for TRE12 trace-reading equip- ment for use in conjunction with a Ferranti Mk 1 computer and aBenson Lehner plotter used by the marine branch of the Italian Govern- ment air defence organization. Also from Southern Instruments comesnews that their analytical-instrument activities will in future be carried out Dy a new company formed for the purpose, Southern Analytical Ltd,with Mr Philip Sellars as chairman.
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