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Aviation History
1964
1964 - 1423.PDF
792 FLIGHT international, 7 May INDUSTRY International Flight Systems Products Company News THE VCIO: SOME CONTRIBUTIONS BY THE INDUSTRY Dunlop Equipment on the VCIO includes tyres, wheels and brakes (incorporating Maxaret anti-skid units); thrust-reverser control equipment on the two inner Rolls- Royce Conway engines; and windscreen- wiper system. The tubeless tyres are carried on wheels consisting basically of flanged half-hub assemblies bolted together. The eight main wheels each incorporates a fusible plug, which ensures controlled deflation of the tyre in the event of exces- sive heat build-up resulting from over-use of the brakes. The eight multi-piston type plate brakes incorporate jig-saw type seg- mented rotor assemblies, and stator assem- blies carrying inorganic brake pads. Each of the main wheels has an associated rim- mounted Maxaret anti-skid unit, allowing the application of maximum braking power in all conditions of weather and runway, without resulting wheel-lock and conse- quent skidding. The windscreen-wiper system consists of three electrically'driven independently con- trolled pump units which supply the fluid pressure to operate three wiper heads and their associated actuating arms and blades. A parking system, consisting of solenoid- operated valves and pressure relays, supplies fluid pressure to the parking cylinders of the wiper heads to ensure that the wiper blades are left at the extremities of their strokes when the wiper system is switched off. Dunlop engine control equipment on the VCIO includes pneumatic twin-cylinder rams for operating the thrust- reversers; relief and reducing valves to regulate the pressure of the air supply from the engine and to relieve any excess pressure in the reverser system; selector valves; and self-locking rams which work in con- junction with the reverser operating mech- anism. Motorized Fuel Valves The Saunders Valve Co, of Blackfriars St, Hereford, supplies numerous valves used in several VCIO systems, in particular two triple motorized valve assemblies, each con- trolling the low-pressure fuel supply and inter-engine fuel supply. The triple units are installed one each in the port and star- board fuel supply installations, both feeding their two adjacent engines. Two of the motorized valves in each assembly control the low-pressure fuel supply and incorporate a one-way pressure relief function, but there is no pressure relief function incorporated in the third, inter-engine fuel control valve. Pumps by Integral Prominent among suppliers of pumps used in the VCIO is Integral Ltd, of Birmingham Rd, Wolver- hampton, Staffs, which has a variety of its motor-driven pumps at work in the various hydraulic systems. A two-stage pump, Type Y.498 Mk 9, delivers 2.85 gal/min at l,2001b/sq in and 7,200 r.p.m. for charging the brake accum- ulators and ground testing. The pump, which is driven by a 400c/s, 3-phase, 200V current to an AEI motor, weighs 29Jlb. An Integral pump is incorporated in the Hobson feel simulator system. This is a 41b 2oz unit delivering 0.20 gal/min at 2,5001b/sq in and 2,500 r.p.m., and is a two-stage type with an initial, medium- pressure stage supplying a single, second- stage piston delivering at the high pressure. First and second stage relief valves and a cut-out valve are incorporated. For topping-up the brake system there is an Integral motor-pump unit, Type 293 Mk 8, with a 28V d.c. AEI motor, which passes 1.125 gal/min at 2,2501b/sq in. Again a low-pressure, gear first stage delivers to a high-pressure, second-stage piston, and there are relief valves for both stages. Operation of the large freight door which is specified for many of the VClOs now ordered will depend on an Integral Type Y.379 Mk 3 motor-pump unit, wherein the initial gear stage delivers fluid to three second-stage pistons via a ripple eliminator which reduces the amplitude of pressure fluctuations to an overall ripple not exceed- ing 3001b/sq in. The pump delivers 1.5 gal/min at 3,0001b/sq in and 7,200 r.p.m. and is driven by a 200V a.c. AEI motor. Sierracote for VC10, Do31 and HFB 320 Sierracote electrically heated laminated- plastic cockpit windows are used on the VC10, and more recently have been ordered for prototypes of the Dornier Do31 VTOL military freighter and the HFB 320 Hansa executive transport. Supplier is D. Napier & Son Ltd. The cockpit side windows supplied for the VC10 consist of three plies of Plexiglas 55 laminated with two interlayers of poly- vinyl-butyral. One of the vinyl layers is designed to maintain cabin pressure in the event of a failure in the main Plexiglas ply. Sierracote electrically conductive trans- Dunlop equipment on the VCIO (news item above) includes tyres, wheels and Maxaret brakes: a mainwheel unit is here seen partly assembled. Dunlop are also responsible for the thrust-reverser control equipment (right) of the Rolls-Royce Conways
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