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Aviation History
1961
1961 - 1223.PDF
FLIGHT, 31 August 1961 325 Servicing stand for Rolls-Royce Tyne engine, by Morfax Ltd NEW from the ACCESSORY INDUSTRY the occupant and the combined parachutepack by inflation from a 1.2001b/sq in air bottle incorporated in the seat; a com-bined parachute pack containing a G.Q. parachute, a survival pack and an emer-gency oxygen bottle in a single envelope: and a tapered back-rest to allow increasedshoulder room between side-by-side seats in restricted crew spaces. The pack andcushion are retained in the seat, so enabling the crewman to vacate the seatand move about unencumbered. For emergency use. there are manuallyoperated levers on each side of the seat. An initial upward pull on either leverreleases the pack from its stowage clips, collapses the headrest, and releases thelap-strap anchorages. A partial down- ward movement of the lever then locksthe releases in a "safe" condition and a final upward pull inflates the cushion.This inflation pushes both the occupant and his pack out of the seat to a stand-ing position from which he may abandon the aircraft. Two methods of mountingprovide for, respectively, (a) roller mount- ing on floor guide-rails and (b) anadaptor set permitting the seat to be pivot-mounted at the rear and supportedat the front by telescopic legs. Microcell Ltd Being shown at Farn-borough for the first time is Microcell's Double Travellite Mk 2 economy-classaircraft seating. In spite of its low weight, state the makers, comfort, flexi-bility and attractive appearance have not been sacrificed. A Microcell product of a contrastingnature is the glass-fibre launching pod for air-to-air and air-to-ground 2in rocketarmament. A number of detailed improvements have been made in thesepacks during the year, principally con- nected with the firing systems and cockpitcontrol and designed to take into account higher operational speeds and altitudes.Four types are now in production—14- and 24-tube launchers retractable intothe fuselage, and 24- and 37-tube models for under-wing mounting. Louis Newmark Ltd Typical of themost recent instrument miniaturization techniques of this company's aircraftdivision is a rate gyro measuring approxi- mately 2in by l|in.In all the company's new design and development, miniaturization techniqueshave been followed to keep the weight of equipment to a minimum. Thus,electronic equipment is transistorized throughout and the form of modularconstruction is used to achieve a high degree of robustness and reliability.Modules are so designed that like func- tions are interchangeable between thechannels of a system, thereby reducing spares holdings. Lucas Gas Turbine Equipment Ltd A photograph on page 324 illustrates anunusual hydraulically driven double- ended fuel boost pump, which feeds fromthe tank at sufficient pressure to prevent cavitation under all flight conditions.The hydraulic drive is effected by the fuel itself, which obviates the need fora return connection, all hydraulic flows being exhausted into the main boost line.The unit consists of a main impeller situated in the centre of the tank, fed byauxiliary impellers driven through bevel gears and located in the top and bottomof the tank. The auxiliary impellers feed the main impeller in normal andinverted flight, the central impeller pro- viding most of the pressure rise. At4.000 r.p.m. the pump can deliver 6.000gal/hr at 301b/sq in, the weightbeing 71b. An entirely different fuel pump is anew and extremely compact high-pressure gear unit designed to operate primarilyon petrols suitable for aircraft gas tur- bines. These pumps consist of a pair ofgears driven from the engine via a quill- shaft, running in plain bearings fullylubricated and sealed against leakage. One of these new units is the GP.200,which weighs only 3.751b yet at 1,000 r.p.m. delivers 200gal/hr at l,2501b/sq in,and can operate at 4,500 r.p.m. Lucas are continuing their researchinto increasingly perfect combustion sys- tems for both gas turbines and ramjets,and the explosive forming of sheet-metal components is being investigated toimprove manufacturing techniques. The forthcoming SBAC exhibition will be theoccasion for unveiling two complete fuel systems for aircraft, one being for aturbine helicopter with an electric-com- puter throttle control (which at oncesuggests the Gnome), and the other being for a bomber powered by twin-spoolturbojets up to an altitude of some 70.000ft (and, since the TSR.2 system isunlikely to be seen this year, this strongly suggests the Vulcan). Marconi Instruments Ltd Among theelectrical instrumentation products of this company are signal generators, oscillo-scopes, voltmeters, power meters, Q- meters and impedance bridges. There areover 30 signal generators in the range, and a typical example is the Type 114H,covering the frequency range of lOkc/s 73Mc/s. In order that a high degree ofabsolute accuracy may be obtained, the instrument has a built-in crystal cali-brator with two crystal frequencies, 400kc/s and 2Mc/s, automatically selectedby the band-change switch. Amplitude modulation can be applied to the carrierfrom an internal or external source at any depth up to 80 per cent. Hayingunusually good frequency-stability (0.002 per cent) and a high-discriminationtuning system, the instrument is particu- larly suitable for narrow-band responsemeasurements. Martin-Baker Aircraft Co Ltd Several new features are incorporated in thelatest production ejection seats by Martin-Baker as exemplified in theMk 4MSA seat installed in the Blackburn Buccaneer for the Royal Navy and theMk H5 for the McDonnell F4H Phan- tom 2 of the United States Navy.Capable of ejection from ground level Martin-Baker Mk 4MSA ejection seat for the Blackburn Buccaneer and at airspeeds from 80 knots upwards,the Mk 4MSA is typical of the current production Mk 4 seats. It incorporatesthe now familiar 80ft/sec three-cartridge telescopic ejection gun, duplex droguesystem deployed by the 0.5sec drogue gun, time release mechanism with g-switch, and leg-restraint system. One of the new features is the electricallyoperated seat-raising mechanism which now replaces the seat-raising handle.The actuator consists of a 28V d.c. motor driving a screwjack attached to thebottom cross-member of the seat struc- ture, operation of the switch on the seatpan raising or lowering the seat as required. The Mk 4MSA is alsoequipped with inertia shoulder-harness mechanism (which allows the occupant tolean freely forward in the seat but ensures that he is held well back onejection) and the drogue link line guillo- tine. The latter, when operated by themanual override lever, explosively severs
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