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Aviation History
1955
1955 - 1240.PDF
354 FLIGHT, 2 September 1955 BOULTON PAUL AIRCRAFT, LTD. Wolverhampton, Staffs. Telephone: Fordhouses 3191 Balliol and Sea Balliol The Balliol T.2 advanced trainer, with Rolls-Royce Merlin 35 engine, is in service with the R.A.F. and the Royal Ceylon Air Force. Its naval counterpart, the Sea Balliol (described below) is operating with the Royal Navy. The specification called for a monoplane of robust all-metal construction, with "modern" handling characteristics suitable for use by day and night for dual flying instruction (including aerobatics); advanced pilot-train- ing (including long cross-country flights); dual front-gun training; dual low-level, glide and dive-bombing training; and glider-towing. In conformity with R.A.F. policy, the instructor and pupil are seated side by side and their wide canopy is placed well forward. All main controls are fully duplicated, as are the gun-sights, and the flying instruments and gauges are placed within easy view from both seats. The inner wings are attached on the fuselage by four pin bolts and the outer wings are similarly attached, but with latch gear to withdraw the lower pair, permitting upward folding. There are two spars, the portion between them forming a rigid torsion box continuous over the span. Ailerons are interchangeable from port to starboard, and there are dive brakes which limit the terminal velocity to 350 m.pii. The fuselage is a circular-section light-alloy monocoque. For armament training a O.3O3in Browning gun can be fitted in the port wing, and provision is made for eight practice bombs or four rocket projectiles. The deck-landing version of the Balliol has an undercarriage capable of absorbing a vertical velocity of 14 ft/sec. The main units have a longer stroke and greater displacement than those of the Balliol, and the tail undercarriage unit incorporates a double- extension oleo-pneumatic shock-absorber, a separate self-centring unit, a shimmy damper, and a steering mechanism controlled from the cockpit. The hydraulically damped arrester hook is controlled by the pilot, and there is a cable-deflector assembly to prevent the arresting cables from fouling die tailwheeL To avoid any disturbance of the centre of gravity by the addition of die naval equipment the accumulators have been moved forward to positions in the inner wings. P.111A Previously illustrated widi blunted wing-tips, diis delta-wing research aircraft is depicted on this page with alternative—almost pointed—tips. The picture was taken on the occasion of me recent Golden Jubilee celebrations at the Royal Aircraft Establishment, where die machine is giving excellent service as a research vehicle. The power unit is a Rolls-Royce Ncne. A parachute is housed in a fairing on die port side of die fuselage to reduce landing speed and rolling distance. The dive brakes are of unique form, being in four rectangular sections, two on each side of the fuselage, one above and one below the wing. Viewed head- on, with brakes out, the P.111A appears to wear a ruff. Power plant ... lUUa-Bap* Martaa 3*Span 39ft 4in Length 35ft 1 JinGross weight 8,704 Ib Max. speed 285 m.p.h. Abme, 5eo Balliol Below. P.111A Power plant ... IMb-Raycc NtnSpan 33ft 6m Length 26ft lm
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