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Aviation History
1960
1960 - 1642.PDF
360 FLIGHT, 2 September I960 Bell's Asbestos sili- cone rubber products 5. G. Brown Gyrotwin NEW from the ACCESSORY INDUSTRY . . . high-temperature strain gauges. The lastnamed are the first of a range of strain gauges designed to operate at tempera-tures of up to 750°C. They are made with a rectangular grid section and transverseresistance and cross sensitivity is said to be negligible. Two types of backings areused. One is a resin-impregnated tissue and the other fibreglass cloth impregnatedwith ceramic cement for operation up to 750°C. The backings are not removableso that the gauge merely has to be affixed to a surface. A future development is agauge which will measure strain during temperature changes; the resistance of astraight gauge increases rapidly with temperature producing a large additionalsignal. In the new gauge built-in thermo- couple devices will provide compensation. The analogue-to-digital converter men-tioned above is a high-speed unit which can perform up to 55,000 conversions persecond. Output is presented in serial form during the conversions and in parallelform at the end. The unit is transistorized and consumes about 11W of 230V. The limited-angle tachogenerator has alin diameter rotor and is designed to oper- ate over a limited angle of 15° either sideof the mid-position. The unit is designed for applications where a d.c. generator isrequired to work over only a few degrees. It thus has an output claimed to be greatlyin excess of that obtained from conven- tional d.c. tachogenerators of the sameframe size. It is also said not to be as prone to mechanical failure under high accelera- tion and severe shock conditions. Associated Electrical Industries Ltd Al-though the principal work of AEI is in the development of complete systems arange of new components has recently been developed. Among these are smalltoggle switches and hand-operated circuit breakers. The switches are available forsingle, double or triple pole applications for ratings up to 20A in either a.c. or d.c.circuits. They can have a straightforward on/off action, be locked in any position orbe spring biased. The new circuit breakers are operatedby a push/pull button and are available in a range of sizes. AEI are also responsiblefor the Sting-ray target-tracking and illu- minating radar which forms pan of theBloodhound weapon system. Aviation Developments Ltd The firmsay that their Huckbolt high-strength bolt- ing system has recently stimulated con-siderable interest in the aircraft industry and that many companies are now incor-porating these bolts in their new aircraft. Advantages claimed for Huckbolts are thegreatly improved joint life that is obtained if interference fits are used, the weightsaving that is possible by using light alloy collars because washers and excess lengthsof bolt are dispensed with, fuel tightness and high rate of placing. It has been shownthat Huckbolts can be placed about 15 times faster than ordinary shear bolts. Bell's Asbestos & Engineering Ltd ""^e "BestobelT range of seals, sleeves andhoses has been improved this year in anumber of respects. Fire seals how have developed silicone sponge cofes andasbestos fabric covers proofed with Viton A. They are thus resistant to skydioland more suitable for increased tempera- ture. The range of garter-spring sealsincorporates new materials and many new qypes of silicone glass fibre connectingsleeves have been developed for air con- ditioning and de-icing systems. Furtherdevelopment has taken place with col- lapsible air starting hoses (now in civil andmilitary service) and to the segment V-band clamps have been added a quick-release clip in addition to the standard worm drive clip. Belling & Lee Ltd A new componentfrom Enfield is a multi-pin connector in which every pin is individually lockedinto its mating socket. In this way it is intended to retain positive connection ofall poles under conditions of shock and vibration. Each pin is bulbous and is afree fit in an axially slotted socket. On the application of a compressive force to themouth of the socket the inside walls are brought to bear near the neck of the pinto lock it into place. Two types of con- nector, the Camlock and the Autolock,employ this principle. Closing force in the former is applied by a bar with a keyhole-shaped slot surrounding the mouth of each socket. It is moved along the row of con-tacts by an eccentric shaft operated by a rotating key built into a free plug mem-ber. In the Autolock type the locking action is achieved automatically in thefinal stage of mating. The outside of the socket mouth is bell-shaped and is closedby axial movement of a cylindrical sleeve; in multi-pole connectors a single lockingplate is employed with a hole pierced for each pole. In another design engagementof plug and socket and subsequent locking of the poles is brought about by angularrotation of the plug housing. Boulton Paul Aircraft Ltd About tnistime last year Boulton Paul made known their work with control fans for VTOLaircraft. These are units driven by either hot exhaust gas or by air tapped from theengine compressor and heated by the burn- ing of fuel in special combustion chambers.Other units were designed to operate on cold-gas drives. Since last September the company havedeveloped these control fans in order to investigate the performance of a typicalsmall ducted-fan design, the potentialities of a cold gas drive, and control problemsassociated with fan lift where an aircraft is dependent for control and stability onthe rapid variation of thrust of these units. Some of the investigations, which havebeen carried out in collaboration with the Dowry Rotol ram air turbine for emergency electrical services on VC10
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