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Aviation History
1952
1952 - 2051.PDF
25 JULY 1952 FLIGHT 25 ACCURATE INDICATION OF AIR TEMPERATURE GOVERNS THE WHOLE ECONOMY OF OPERATION mmmmmmmm WestonThermometry has been chosen for several applications on the De Havilland 'Comet' including fuel temperature, cabin air tempera ture, wing and tail de-icing as well as outside air temperature. Illustrated is the Model S.110G/9 Thermometer Bulb with its associated Indicator, the Model S.63 circular scale Ratiometer used for outside air temperatures. WESTON Flight Planning The air temperature is one of the most important factors in the operation of a long-range iet aircraft as it influences the rate of climb, the heights at which the aircraft will cruise, and hence the true airspeed. The latter in turn determines the specific range (air miles per pound ol fuel) since within limits, fuel consumption per hour at the normal cruising altitudes does not vary much. It can be seen therefore that air temperature controls the choice of flight path, largely determines the fuel load carried, and governs the whole economy of the operation. The effect of air temperature on Comet operations can be illustrated by the fact that a io°C. rise in temperature reduces the cruising altitude by 2,000 ft., the true airspeed by 13 knots, and the cruising specific range by 2%. AIRCRAFT INSTRUMENTS NAMGAMO WESTON LIMITED i; \ I I li L I) MIDDLESEX Tel: Enfield 3434 (6 lines) 1242 (4 lines) Grams: Sanwest, Enfield. London Office: St. Georges Court, 22-26 New Oxford Street, London, W.C.I. CHA 4971. Scottish Factory: Port Glasgow, Renfrewshire, branches: Glasgow, Manchester, Newcastle-on-Tyne, Leeds, Liverpool, Wolverhampton, Nottingham, Bristol, Southampton. Brighton CONTROLS • • • • • • • • • • • • WING AND ENGINE ANTICING SYSTEMS STARTER TIME AND SEQUENCE SWITCHES CABIN CONDITIONING SYSTEMS MASS FLOW CONTROLS WIND-SCREEN ANTICING CONTROLS FUEL TANK PRESSURISATION HOT AIR VALVES FUEL VALVES PRESSURE SWITCHES AND CONTROLS THERMOSTATIC CONTROLS HUMIDITY CONTROLS ELECTRO-MAGNETIC VALVES Each of these specialised requirements for modern aircraft opens up a spate of problems . . . each represents a field in which Teddington have acquired unique knowledge and experience. AUTOMATIC CONTROLS lEDDINCTON CONTROLS LTD., CEFN COED, MERTHYR TYDFIL, SOUTH WALES. Merthyr Tydfil 666
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