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Aviation History
1928
1928 - 0589.PDF
JULY 5, 1928 THE ARMSTRONG WHITWORTH "ATLAS" One Armstrong-Siddeley " Jaguar " Engine GENERAL THE " Atlas," designed by Sir W. G. Armstrong WhitworthAircraft, Ltd., of Whitley, Coventry, is a two-seater general purpose aeroplane. It is fitted with a " Jaguar " engine,which may be of various types according to the purpose for which the aircraft is intended. It is the standard Armyco-operation aeroplane for the British Air Service, for which purpose it carries two machine guns, wireless, camera,message-picking-up gear, and small bombs. It can also be arranged as a light bombing aeroplane, for which purposethe total load carried is increased and extra petrol tanks can be fitted. Fuselage.—This is made of high-tensile solid drawn tubebraced with swaged wire, and built up with mechanical .joints without the use of welding. There is ample room for the pilot and gunner, and a prone position for bombingcan be provided. Wings.—Arranged as a biplane with the top plane largerin chord and span than the bottom plane. The construction is entirely in high-tensile strip steel and solid drawn tubeand bracing wires, except the covering, which is of fabric. The interplane struts are streamline tubes. The aileronsare on the top plane only, and have horn balance. Tail.—The tail plane and rudder are of similar steel construction to the wings. The elevators and rudder are both balanced. Engine Installation.—The " Jaguar " engine is mountedon a pressed-steel bearer which can be detached with the engine by undoing four bolts. The magnetos and carburettorare accessible through large doors in the fuselage. The petrol supply is by gravity from a 75-gall. tank in thefuselage. Extra tanks can be carried on the wings to increase the range. The " Jaguar " engine may be super-charged or unsupercharged, and the airscrew may be geared or ungeared. The performances given are for a gearedengine unsupercharged with normal petrol and 800 lbs. of military load. The petrol is enough for four hours'flying at a cruising speed of 120 miles an hour. Undercarriage.—The oleo legs have a long travel. The first shock is taken by the displacement of oil and the suspension on the ground is by steel springs. The axle is of high-tensile steel with the wheels running on detachable sleeves. Power Plant EngineNormal h.p. . . Propeller driveFuel capacity Placing of fuel tanks " Jaguar S." 450 h.p. Geared to 0-65 to 1. 75 galls. (337-5 litres). On top of fuselage. Main Dimensions SpanOverall length HeightTop chord Bottom chord Gap .. Surface of main planes 39 ft. 7 in. (12 m.).27 ft. 8-5 in. (8-4 m. 10 ft. 6 in. (3-2 m.).6 ft. 7 in. (2 m.). 5 ft. 7 in. (l-7m.).5 ft. 6 in. (l-6m.). 391 sq. ft. (36-3 m.2). Weights and Loading Weight empty .. .. 2,550 lbs. (1,147-5 kg.).Load carried 1,470 lbs. (661-5 kg.). Total loaded weight.. .. 4,020 lbs. (1,809 kg.). Wing loading 1003 lbs./sq. ft. (498kg./m.: Power loading .. . . 9 lbs./h.p. (4-02 kg./.CV). Performance Speed at ground level5,000 ft 10,000 ft Landing speed Climb to 5,000 ft. (1,525 m.) 10,000ft (3,050m.). 15,000 ft.(4,570m.).Absolute ceiling Service ceilingRange at cruising speed 537 146 m.p.h. (235 km./hr.).143 m.p.h. (230-2 km./hr. 135 m.p.h. (217-3 km./hrJ55 m.p.h. (88-5 km./hr.). 4 mins.9£ mins. 20 mins. 19,000 ft. (5,791 m.).18,000 ft. (5,486 m.). 480 miles (772-8 km.). F2
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