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Aviation History
1949
1949 - 1535.PDF
s Supermarine^ Spitfire Trainer. Vickers-Supermarine Attacker F.I Vickers-Supermarine Seagull. T ITTLE may be said of this experi- l-> mental aircraft beyond the fact that it is a development of the Attacker with swept-back wing and tail surfaces. It has been designed to investigate the problems associated with flight at and beyond the speed of sound and, like the Attacker, is powered with a single Rolls-Royce Nene turbojet. The wing area, at 273 sq ft, is greater than that of the Attacker, and automatic slots are provided on the lead- ing edges. The tail-down undercarriage of the Attacker is retained. Although the name Swift is frequently used for the "510" this is not officially recognised. Span, 38ft 8'/,in; length, 38ft lin; max. height(tail down), 8ft 0.7in. loads to the bombs. Seafire F.R.47 data are :— Span, 36ft llin; length, 34ft 4in; gross weight,10,200 lb; max. speed, 452 m.p.h. at 20,500ft; service ceiling, 43,100ft. - , Spitfire Trainer IN this well thought-out dual-controlversion of the Spitfire the forward cock- pit (normally occupied by the pupil) is over a foot farther forward than on the Spitfire fighter, and the rear cockpit is stepped up. Particulars for the Spitfire Trainer, con- verted from the Mk.8 fighter, powered with R.-R. Merlin 61, are :— Span, 36ft loin; length, 31ft 4y,in; gross weight, 7,400 lb; max. speed 393 m.p.h. at 20,000ft; rangewith typical load, 500 miles; service ceiling, 40,600ft. AHac-lter NOW in production for British NavalAviation, the Attacker F. 1 is a deck- landing fighter powered by a Rolls-Royce Nene turbojet. The tailwheel under- carriage has given good results in deck- landing trials. "Lift control" in the form of pilot-operated spoilers is a feature of special interest, intended to overcome the disadvantage encountered with jet air- craft, arising from the absence of airscrew slipstream. By utilising the special spoilers on the Attacker's wing, the pilot approaches at a fixed throttle setting. opening the spoilers fully on receipt of "cut" from the batsman. In addition to its armament of four 20-mm. guns, with 624 rounds of ammunition, the Attacker will carry two 1,000-lb bombs or four 300-lb rockets. The Attacker's nose is unusual in being a true "lobster claw" of laminated aluminium-alloy sheet, as much as 0.56in thick at the top and bottom and having no stiffening members. This serves to protect the pilot and is convenient for pressurising. On the Naval version, in addition to the retractable lift spoilers forward of the flaps, there are hydraulically operated dive-recovery flaps outboard of the gun bay. Due to its power plant layout the Attacker presented some formidable tank- age problems; these were met by recourse to a multiplicity of tanks—five in the fusel- age and two in the wings. The air for the Nene enters two ducts which converge at the engine bay. The entry to this bay, or plenum chamber, which is sealed to hold 6% lb/sq in, hasieen the subject of special study to ensure smooth passage of the air to the rear impeller face. Span, 86ft llin; length, 37ft 6in; normal grossweight, 11,300 lb; ma*, speed, 590 m.p.h. at sea- level; climb to 30,000ft, 6.17 min; service ceiling,*8,500ft; max. range with drop tank, 1,100 miles. Yickerw-Supermartne 8ea«rull SINCE the Seagull flew at the previousS.B.A.C. display, various improve-ments, notably the redesign of the central superstructure and the addition of a third fin, have been incorporated. The most re- markable feature of the Seagull—a Griffon- engined monoplane amphibian of excep- tional efficiency—is the variable-incidence wing, with interconnected full-span lead- ing-edge slots and slotted flaps. For take- off the wing can be set at the optimum angle and in level flight may be adjusted to reduce hull drag. Span, 50ft Gin; length, 44ft lV,in; normal grossweight, 14,500 lb; max. speed, 260 m.p.h. at 11,800ft; range with typical load, 875 miles; service ceiling,23,900ft. v Westland Wyvern MENTION is permitted of three ver-sions of the Wyvern torpedo fighter : the T.F.I, with Rolls-Royce Eagle 24- cylinder piston engine, the T.F.2 with Armstrong Siddeley Python turboprop, and W.35 with Rolls-Royce Clyde turbo- prop. The version selected for production is the T.F.2, and, although performance figures for this variant may not be pub- lished, it is of interest to note that the piston-engined T.F.I attains a maximum speed of 455 m.p.h. The armament is 1—20-in torpedo, or 1—2,000-lb bomb, or &—60-lb R.P.s, in addition to four 20-mm. guns. (N.B.: The latest fin and rudder developed for the Wyvern T.F.2 are taller than those shown in the photo- graph on the preceding page.) Span, 44ft; width folded, 18ft; length, 42ft.
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