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Aviation History
1952
1952 - 0913.PDF
FLIGHT, 4 April 1952 417 Boulton Paul Sea Balliol (Rolls-Royce Merlin). North American 7-28 (Wright Cyclone 7). distinguished by six astrodromes along the top of the fuselage. The world's jet trainers are most appropriately grouped accord ing to whether they are conversions of established fighter types or of new, specially conceived, design. In the former category the pre-eminent examples are the Gloster Meteor T.7, de Havilland Vampire Trainer (R.A.F. designation, Vampire T.II) and the American Lockheed T-33 (Shooting Star development). Though the Meteor already has a long and successful tour of R.A.F. duty behind it, the Vampire Trdner is new to the Service. It scores over the Gloster in that it can carry gun or rocket armament—an advaitage it shares with the T-33. Furthermore, it should prove considerably more economical in operation, though the Meteor is notably superior in certain aspects of performance. The T-33 has been turned out in very great quantities with the Allison J-33 turbojet, but is now being produced in Canada with a Nene. Although, as mentioned in the former review, the first jet trainer was France's Nene-powered S.O.6000 Triton, this type was never seriously regarded as a school machine. This, however, is far from being the case with the Fokker S.14 two/three-seater, Vickers-Armstrongs Varsity (two Bristol Hercules). Convair T-29 (two P. and W. Double Wasbs). Hawker Sea Fury Trainer (Bristol Centaurus). Fiat G.59/4 (Rolls-Royce Merlin). powered with a Rolls-Royce Derwent and having a maximum speed of about 440 m.p.h. The S.14 is a very capacious machine and though, as will be judged, the performance is only moderate, it should be adequate to meet requirements of the immediate future. A very different approach to the jet-trainer problem is seen in the Fiat G.80, the first prototype of which is now flying with a Goblin 35 turbojet, though the second will have a Nene. Very clean aerodynamic design, excellence of construction, and tandem seating, have contributed to a very high performance (550 m.p.h. with a Goblin), but it must be noted that fighting, as well as train ing, requirements were in mind when the designs were prepared. Though of lower performance, the projected Boulton Paul P.119 (Rolls-Royce Derwent) will be a roomier machine with side-by- side seating. Should the ultimate in performance be desired, a Nene can be accommodated and with this unit the speed would rise from 475 m.p.h. at 22,500ft to about 555 m.p.h. at 10,000ft. Finally, acknowledgement must be made of France's lead in the development of light, simple, jet trainers, exemplified by the appeal ing little Fougas, with their low-thrust Turbomeca jets. Percival Sea Prince (two Alvis Leonides). Fokker S.13 (two Pratt and Whitney Wasps).
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