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Aviation History
1943
1943 - 2094.PDF
222 FLIGHT AUGUST 26TH, 1943 SWEDEN'S NEW FIGHTER devise a mechanism for closing thedoors for the wheels and struts of the retractable undercarriage when this is-'in the "down" position. In addition to the aerodynamic advantage of thisarrangement, there is the further practical point that dirt and mud arenot flung into the wheel wells while the aircraft is taxying, taking off orlanding. So far as general design is con-cerned, the J 22 might be described as a low mid-wing type. Most of the ad-vantagps of having the wing on the fuselage sides instead of at the bottomare probably achieved, and by retract- ing the wheels into the fuselage sidesat the wing junction it became possible to keep the thickness of the wingrelatively small at the root. At the tips, however, the designers kept the wing thickness fairly great and cut ofialmost square, presumably in order to prevent tip-stalling at large angles of incidence. Tail Surfaces In cross-section the fuselage is egg-shaped. In the for-ward part the greatest width occurs at the level of the wing. As the tail is approached, however, the maximum widthmoves up, and at the tail it is on the level of the tailplane, which is «ret fairly high, thus providing a good anchoragefor the tail. The arrangement of the latter is slightly un- usual in that the fin trailing edge and the stern post forthe rudder are aft of the trailing edge of the elevator. The object of the arrangement was* to prevent air spilling overthe inner ends of the elevators. That it is effective appears to be proved by the fact that the elevator control has beenfound to be powerful, although the elevators are smaller than is customary. Both rudder and elevators are aero-dynamically balanced, partly by set-back hinges and partly by horn balances at ti\e tips. On the forward part of the fuselage there are no prwj'ect-ing air intakes and no oil coolers. These are installed in the leading edge of the wings, and it is reported that agood "ramming" effect is obtained for the intake air. To British eyes the wheels of the undercarriage are un-usually far forward. While this should herp to prevent nosing-over, one would imagine that this placing mighttend to cause "swing," and possibly the designers thought the same, for the tailwheel is so arranged that whenextended it is locked in the fore-and-aft position. The J 22 is of mixed construction, with an all-wood wing(except for the flaps^and ailerons, which have a frame- work of spot-welded:"stainless steel and fabric covering) anda fuselage having a welded steel tube primary structure, covered with birch plywood. Fin and tailplane are ofsimilar construction, and rudder and elevators are of spot- welded stainless steel, fabric covered. They are providedwith trimming tabs. j To get good take-off and climb, the doors for the undercarriage are designed toclose whett the wheels are fully down. Thus also is dirt kept out. The engine of the J22 is a Pratt and Whitney Twin-Wasp.It drives a Hamilton Standard three-bladed airscrew. Pilots who have flown the J 22 report that it is easy tofly and very manoeuvrable. Lateral stability is particu- larly good, even at very low speeds, and the rudder controlis good past the stall. The machine is said to come out of spin readily, and at high speeds the control Ibads aremoderate. For the illustrations of the J 22, and for the informationupon which above notes were based, we are indebted to our Swedish contemporary "Flyg," of Stockholm. MORE WAR PICTURES TO the already large collection of war pictures at the NationalGallery was added another room of nearly 80 paintings and drawings. It is pleasing to think that a few artists candevote their talents to such a variety of war subjects. They form a valuable pictorial record of our times. Limestonequarries, dusty desert scenes, bomb-scarred London, hospitals and factories, portraits of notable personalities, everythingfrom sea to sky is the field of their canvases. They are, of course, modern paintings, and as such will have no parti-cular aesthetic pleasure to some admirers of, say, XVII- century art. Stanley Spencer adds to his numerous large panels anotherimportant work. The artist sees the "New Brave World" dominated by mechanical, grotesque implements, where menare mere ant-heaps of jelly-like human forms. Edward Ardizzone presents in graphic drawings the NorthAfrican campaign. Among the many portraits by Henry Carr is that of Air Chief Marshal Sir Arthur Tedder, G.C.B.,.AirOfficer Commander-in-Ohief, Mediterranean, and William Dring contributes a pleasing one of Admiral Sir John CroninTovey, K.C.B., K.B.E., D.S.O., Commander in-Chief, Home Fleet. R. V. Pitchforth exhibits ten water-colour paintings of sub-jects connected with aviation, airfields, runways, torpedoes; while Leslie Cole and John Armstrong include amongst theirsubjects parachutes and the building of gliders. •/
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