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Aviation History
1933
1933 - 0097.PDF
FLIGHT, JULY 13, 1933 #-"•: • :..„...... J. . .:,,:.,_.^J-: '•.':__ FOR TAXI WORK AND JOYRIDING : In the " Cadet " three-seater the front cockpit has room for two, side by side. (FLIGHT Photo.) the previous model only in minor details like the seating arrangement. In the 643 the pilot's seat has been raised a little, thereby giving him a somewhat better view over the head of the front passenger. It will still have very full dual equipment, including the delightful Avro type, tail trimming gear, fuel controj cocks, wheel brakes, adjustable rudder bars and complete instrument installation. The 638 is mainly intended for club use or for private owners. It has folding wings, and therefore the pro nounced stagger of the standard machine is greatly decreased. The fuselage remains the same, as does the equipment. The 640 is a new departure altogether. In this type there is no question of training or dual control, and it is intended mainly for joyriding. The front cockpit has been enlarged so that it now accommodates two passengers seated side by side in comfort. The wings and tail units art the same as the 638. i he 639 is -also something very new. Once again the wmgs and tail units are standard, but the fuselage has both been widened and extended upwards to fill the space between the top and bottom planes. The cabin so formed will accommodate three persons with the pilot in front, where he will have an excellent view. As we have already intimated, these machines are all in a series based on the original " Cadet," and it is there- rare possible, from a structural point of view to treat them together. In keeping with Avro present-day practice, the fuselage i welded-steel tube construction. Tubing of specifi- ion D,T.D.89a is used, and by this means the welding ;'t>le to be a straightforward job, not necessitating the '* of pinned or strapped joints. FLIGHT for April 27 we gave our readers an insight he constructional methods in use in this factory, and w.e methods, although in that particular case were as "d to the Avro " Tutor," are the same for the fuse- jges of the " Cadet." The front half of the structure, bfUaId from the bulkhead behind the rear seat, is strut str'tv! an(* *? built up as one unit. The rear half has » braced sides, but the top and bottom has piano-wire into^tvf anchorecl to small loops of tube which are welded arou H "l011161"8- Tne wire itself is a continuous loop led stra these small pieces of tube and has an Avro R40 ntrhln ^ ^or tensioning purposes. In the three-seater, depth of the sides, particularly around the i- USl into th, in ord S' +S decreasecl> while the width i» very much greater while ih accomrnodate the two passengers side by side, as ther ^ ate na-turally several minor differences inasmuch c 0ntrnk ^ D°u necesFity to provide mountings for the flying the stru t? • fr0nt cockPit- APart from that' however, also Vw,.-C ,ye *s OI the same type. The cabin machine is Das 'cally the same, although here the greatly increased depth of the sides has enabled tube of smaller section to be used while retaining the same strength. The sides are led right up to the top centre section and form frames for the doors which hang either side and are built of steel tube themselves. In all cases the tail skids are of the leaf-spring type, full swivelling and restrained by a check spring. The shoe is a massive casting which has a coating of a specially hard metal welded over the bottom of it, preventing the wear which would otherwise take place. The tail plane is adjustable in flight, from either cockpit in the case of the standard and club models, by the neat screw gear raising or lowering the trailing edge which Avro's have used on their machines for some time now. The gear is operated by handwheels of ample size placed just on the left-hand side of the seats in each case, and a very fine adjustment is obtainable. This is one of the important points which makes the " Cadet " so nice to fly, it being possible to trim it exactly, whatever the condi tions of load. The vertically-placed screw is worked by cables led through fairleads from the handwheels and works directly on to the trailing edge. A tell-tale is used in both cockpits showing the position of the tail plane, so that for training it is an easy matter to give a pupil marks to work to for landing, taking off or climbing, etc. The fabric covering of the rear part of the fuselage is secured over spruce stringers which are attached to the outside of the tubular structure in order to give it an efficient form. " Zip " fasteners are fitted where inspec tion holes are required. The three-seater, club and stan dard machines have a fabric-covered plywood top decking over the cockpits with large doors fitted on each side which make getting in and out of cockpits an easy matter. In the three-seater the front cockpit is also plywood lined, and over the flooring and footrest embossed aluminium is used. This gives a very clean, attractive appearance to the cockpit and has the added advantage not only of making the cockpit easy to clean—an important point for a joy riding machine—but also of keeping the passengers from sticking their fingers or feet through the sides. The foot- rest, a sloping board across the full width of the cockpit, is most comfortable, and should give confidence to those nervous passengers who like to " brake " hard when diving or coming into land—it is quite strong enough for the l I IDO ~\ k^ F^ AVRO 643 STANDARD "CADET" 7CYL. 'GENETMAJOrV ENGINE yy 703
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