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Aviation History
1952
1952 - 1914.PDF
24 FLIGHT II JULY 1952 ACCURATE INDICATION OF. AIR TEMPERATURE1 GOVERNS THE WHOLE ECONOMY OF OPERATION ^nmi WestonThermometry has been chosenfor 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 AIRCRAFT INSTRUMENTS Flight Planning The air temperature is one of the most important factors in the operation of a long-range jet aircraft as it influences the rate of climb, the heights at which the aircraft will cruise, and hence the true airspeed. The latter m turn determines the specific range (air miles per pound of 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 I0°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%. From the article "Operating the Comet'1'' by D. O. MacDougall in the May issue of Shell Aviation News. «| S \ \ U \ n O WESTON LIMITED ENFIELD 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 E ) Steel Office and Works EQUIPMENT and Works ] PRIORITY GIVEN TO DEFENCE ORDERS STORES BINNING with shelves perforated to take vertical dividers and drawers slotted for dividers. Size 6 ft. high x 3 ft. wide x 12 ins. deep with 6 holes 12 ins. x 12 ins., 30 holes 6 ins. x 6 ins., 18 drawers, 2^ ins. x S| ins. x 11i ins. ALL STOVE ENAMELLED Full details of above and of OPEN TYPE RACKING AND BINNING on request. Steel PARTITIONING HYGIENIC- RIGID - STRONG - ATTRACTIVE - NOISELESS - DURABLE - ECONOMICAL High grade steel, Double or Single Skinned. Supplied glazed, with glass panels mounted in vibration absorbing rubber for offices, or weld mesh for works and stores, with single, double or sliding doors, serving hatches etc., as required. VOUR PROBLEMS AND ENQUIRIES INVITED ORWOOD STEEL EQUIPMENT (LONDON) LTD. 44 NORWOOD HIGH STREET, LONDON, S.E.27 Telephone: GIPsy Hill 1104/5
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