FlightGlobal.com
Home
Premium
Archive
Video
Images
Forum
Atlas
Blogs
Jobs
Shop
RSS
Email Newsletters
You are in:
Home
Aviation History
1960
1960 - 1647.PDF
fllCHT, 2 September 1960 ie Cooling system operates from ae stage centrifical compressor driven -, air turbine. In operation control ofIu, sYsteffl is pneumatic. It is duplicated P the aircraft and mounted in pack form.Other equipment from Normalair is an emergency 70-litre gaseous oxygen systemftwiriounting on a P^01'8 ejection seat and a lightweight reciprocating refrigerantcompressor. The latter has a maximum •need of 4,500 r.pjn. and when used withfreon has an evaporator duty of 28,700 b.t.u./hr. Pbnnair Ltd A number of new axialflow blowers have been produced includ- ing one now under development for theVC10. Two of these are to be included in the air conditioning system for cabin airrecirculation. They are driven by a 5 h.p. motor running at 11,000 r.p.m. on a three-phase 400c/s electric supply and at design point provide 880 cu ft/min. The com-pany say that as a result of extensive design and development work an integralsound muffler has been incorporated to minimize noise; it can be applied to themajority of Plannair axial blowers at a moderate additional charge. Another unit under development is a6kW blower heater which will be used on the Shell Aviation D.H. Ambassadors.The first will be installed during the coming winter. The Plessey Co Ltd A lightweight air-borne UHF transmitter/receiver is a new product of this company. Known as thePTR.170, on this set can be selected one of 12 pre-set channels in the range225-399.9Mc/s and the equipment is said to operate satisfactorily at altitudes of over35,OOOft. The unit has been designed for light aircraft, helicopters and as standbyUHF equipment to meet naval/general/ aiistaff operational requirements. Modularconstruction is employed and a transistor- ized power supply. Another new item is the PV.132-135wide-band aerial multi-coupler system designed for use in the HF band over2~30Mc/s. It feeds up to 80 single-channel receivers from one aerial without signalstrength loss and with low noise factor. The system comprises a wide-band ampli-fier, filter panel, matching panel and out- put panel. Up to 12 alternative aerials canbe selected from the output panel by coupling to a special electronic aerialswitch system. Also new is the telebriefing transistorized audio amplifier. This isdesigned to be connected to the standard perimeter land line system of an airfieldand it enables a controller to brief pilots while at readiness in their aircraft imme-diately prior to take-off. A snatch plug pro- vides automatic disconnection at themoment of take-off. In the electronic and mechanical fieldare a number of new items including the Plessey generation system for the VC10,a constant-speed drive/ starter, miniatur- ized cylindrical relays and a liquid-fuelstarting system. . The a.c. generating system for the VC10is based on components which in airline operation are reported to have maintained* F*®11 time-between-failure in excess of •>,owhr. The basic components of a singlegenerator channel are a brushless a.c. generator, a control panel of static designcoupling transistorized sensing circuits, a TOItage regulator which provides controlw within plus or minus one per cent "•rough magnetic amplifier circuits, and atransformer package. In a split such as that of the VC10 the sec-can be separated with the introduc- 365 Blind flying panel of Smiths flight system. Above, a.s.i., director horizon, altimeter. Below, r.m.i. selector, beam compass, verti- cal speed indicator tion of an auxiliary control panel whosefunction is to parallel the sections if required and to share the available systemcapacity over essential equipment in the event of loss of one or more power units.The constant speed drive/starter unit is interesting because it appears at a timewhen a similar development has been pro- duced by the Lucas organization. In thePlessey design input to the alternator is a combination of engine drive and rever-sible air motor interconnected through a differential gear box. Below cruise condi-tions the air motor is bleed-air driven while at cruise and above the unit requiresno air but takes mechanical power only from the engine. Connection to a low-pressure air supply enables the unit to be operated as an engine starter and to beused for ground checking of aircraft sys- tems without running the main engines. R. B. Pullin & Co Ltd Under this head-ing is included the work of Measuring Instruments (Pullin) Ltd, who with thePullin up-sensing, high sensitivity on/off controller have recently done something toovercome the contact-pressure difficulty experienced by instrument manufacturers.In this equipment the pointer is made to interrupt the fine light beam to a phototransistor so that no extra load is put on the instrument movement. Special attentionhas been paid in the design to making the instrument easy to read. There are notthe parallax errors which have previously been unavoidable in reading curved scaleswith the index on the front of the dial. The parent firm of R. B. Pullin haveadded to their range size 18 synchros, and size 15 and 18 servo motors and motorgenerators. These are for both 400c/s and 50c/s operation. Rotax Ltd Emphasis this year has beenplaced on generating and starting systems, including a constant-speed-drive starter(manufactured under an agreement with The Garrett Corporation of America) anda solid-rotor alternator. There are three versions of the latter machine: a standard35kVA unit, a 9kW d.c. machine without rotating rectifiers, and a drop-out unit foruse on the VC10. All are derived from a basic 20kVA machine which has been oncontinuous development in the labora- tories at Hemel Hempstead for the past 12months. The constant-speed-drive starter con-sists basically of a pneumatic turbine starter, differential gear train and aircraftgenerator. A ground source or bleed air can be used for starting any turbojet orturboprop engine and the unit can supply a.c. for checking out aircraft accessoriesprior to main engine starting. It also pro- vides constant-frequency electrical power.Turbine, gear train control system are all similar to those in production air-turbinestarters and Rotax suggest that a high degree of dependability should thus beachieved. Rover Gas Turbines For the AW.660Rover Gas Turbines have developed an airborne auxiliary power unit which canbe used for engine starting, power for ground-service checking, operation ofwinches and doors, loading, and for emer- gency electric or hydraulic power. Weigh-ing 3101b, this APU is equipped with a 9kW Rotax generator supplying sufficientcurrent to start a Dart engine, and an integral hydraulic pump with an output of5.5 Imp gal/min at 2,6001b/sq in. A flange is provided for fitting any other typeof auxiliary which would be driven at 4,500 r.p.m. The basic rating of the Rover gas tur-bine is 65 b.h.p. at standard temperature and pressure and the engine is said tooperate reliably at all altitudes up to 25,OOOft. Starting is instantaneous up to15,000ft, but with a different type of fuel system this is increased to over 45,000ftand operation is possible up to 50,000ft. Accessories are mounted on a light-alloygearbox and die whole unit is enclosed in a stainless steel fireproof nacelle. Withinthis, engine and auxiliary equipment cool- ing is provided by a two-stage axial-flowblower and exhaust air from the generator and oil cooler is used to ventilate thenacelle and then insulate the aircraft struc- ture from the hot exhaust gases. Sinunoods Aerocessories & Firth Cleve-land Instruments Ltd These companies in the Firth Cleveland Group havedeveloped two new products which are shortly to be shown for the first time. Oneis a Pacitor gauge for liquid oxygen and the other a vehicle for dispensing oil. ThePacitor gauge has been developed by Firth Cleveland Instruments for and in co-operation with Normalair and is based on the type 2 Pacitor system. Both masterand repeater indication can be provided at widely dispersed points in the aircraftand the contents of a number of converters can be summated or switched to givecombined or separate indications where multiple installations exist. The Simmonds aerolube oil dispenseris trailer-mounted and designed to deliver aviation lubricating oil through 20ft ofliin bore hose at 15 Imp gal/min. It is self-loading and has an independent pumpmetering unit. The oil is dispensed from a 100 Imp gal storage tank. Spenry Gyroscope Co Production has recently started on a British-made Roto- race directional gyro which is incorpor- ated in a new range of C.L.I 1 Gyrosyn compasses. These are assembled in a super-
Sign up to
Flight Digital Magazine
Flight Print Magazine
Airline Business Magazine
E-newsletters
RSS
Events
