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Aviation History
1928
1928 - 0176.PDF
MARCH 8, 1928 [" FLIGHT " Photographs THE AVRO "AVIAN III " : Above^A top centre- section with and without the petrol tank. Below—A wing root of the lower plane. This is of triangular plan form to suit the folding arrangements of the wings. moves upward slightly. The combined effect is to lower the machine and to relieve the load on the tail skid. Thus, with the wings folded., the machine can be wheeled along quite easily by one man. The divided undercarriage has other advantages, such as a wide wheel track which renders possible taxying the machine in a strong cross wind without risk of it being blown over on to a wing tip. The absence of a horizontal axle'also lessens the risk of nosing over in long grass or corn, in case of a forced landing. Telescopic jury struts are used to separate the. inner ends of the wings when the latter are folded. When the wings are spread the jury struts are " telescoped " and rest in clips under the top plane. The wing construction of the Avro " Avian " is of perfectly normal two-spar type. The wings are but slightly staggered in relation to each other, but the gap is large and the biplane arrangement is probably very efficient. The top plane centre-section contains the petrol tank, which has a capacity of 20 gallons. An interesting feature is that one of the centre-3ection struts is used as the petrol gravity pipe, the flexible petrol tubing being joined to the lower end of this strut. This is indicated in the side elevation below. The high position of the petrol tanks ensures an ample head of petrol even during a steep climb, and, of course, the petrol system is greatly simplified by using direct gravity feed. " When fitted with the standard " Cirrus " Mark II engine, the tare weight of the " Avian III " is 875 lb. The normal loaded weight of the machine is 1,360 lb., and the certificate of airworthiness covers up to a gross weight of 1,450 lb. for " aerobatics," and up to 1,600 lb. for ordinary straight flying. In other words, if it be desired to use the " Avian " for long- distance non-stop flights, a large tank can be fitted in the front cockpit, and the machine may be loaded up to 1,600 lbs. without exceeding its C. of A. for " non-aerobatic " flying. The main dimensions of the " Avian III " are given on the general arrangement drawings. The main performance figures are as follows, and apply to the loaded weight of 1,360 lb. : Top speed at ground level 105 m.p.h. (170 km./h.). At 5,000 ft. the top speed is 100 m.p.h. The absolute ceiling is 17,000 ft. (5,180 m.), and the stalling speed, 40 m.p.h. 1360Power loading, = 17 lbs./h.p. Wing(65 km./h.). . A- 1360 loading, 80 5#57 lbs./sq. ft. 0-328 h.p./sq. ft. (3-53 h.p./sq. m.). Everling Quantities. " High-speed Figure" : 26 " Distance Figure ": 4-9 " Altitude Figure " (Ceiling): 7 80Wing Power," —r-r = 244 6. All these figures are high, and well above the average. THE AVRO " AVIAN III " : This side elevation shows most of the details in the fuselage. The manner in which the undercarriage wheels move back and up when the wings are folded is indicated by dotted lines. The Home Secretary at Leeds SIR WILLIAM JOYNSON-HICKS, Home Secretary, who addressed the members of the Leeds Conservative Association •on February 27, paid a visit to the works of the Blackburn Aeroplane and Motor Co., Ltd., at Roundhay before he left for London. The visit was somewhat in the nature of a surprise, and Sir William saw the works proceeding under normal conditions. Among the various items of interest he saw dining his inspection was the work upon an order of 42 Armstrong Siddeley " Siskin " single-seater fighters being constructed for the Royal Air Force. Miss Ruth Elder's Medal THE Chairman of the Senate Aviation Committee of New York has presented to Miss Ruth Elder—who made a plucky but unsuccessful attempt to fly the Atlantic last year —the medal of the Spanish Legion of Honour, which was conferred upon her by the King of Spain. 156
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