Constant Speed Alternators Following a licence agreement with Precision Méch- anique Labinal in Paris, The Plessey Co. Ltd. Ilford, Essex, are manufacturing a range of aircraft constant speed alternators. The 4 kVA unit in this range is Details of Some Components Used for Subsidiary designed to operate at altitudes of up to 55,000 ft. with forced draught cooling and will withstand Services in Aircraft, Missiles and Space Vehicles accelerations up to 15g in all directions. It has been operating successfully in French fighter aircraft for some years and a French Type approval has been Aircrew Ejection Capsule many civil and military aircraft which require global obtained. navigation techniques of outstanding precision and More than sixty actual parachute drops have been At the moment machines have been developed over accuracy, and installations include those for the made in tests near the Salton Sea, U.S.A., to demon the power range 4-19 kVA and units of up to 35kVA Douglas DC.8, the Boeing 707 and the Airco DH. 121. strate the possibilities of a new seat system, developed are currently being investigated. The CL.11 compass weighs 20 lb. complete and by engineers of North American Aviation Inc., Los comprises the directional gyro, compass indicator, Angeles 45, California, U.S.A., for the B.70 Valkyrie controller, flux valve detector unit and amplifier supersonic bomber. rack. The compass specification covers operation In the event of an emergency at altitudes of the from minus 54 deg. C. to plus 71 deg. С and at order of 70,000 ft., crew members' scats convert into altitudes from 0 to 70,000 ft. the flux valve detector capsules which would permit them to descend to alti unit from minus 73 deg. С. to plus 142 deg. C., thus tudes where they could survive without the capsule's covering the range of skin temperatures encountered protection. If forced to leave the plane, the encapsu on modern high speed aircraft. lated crew members would be ejected through escape The construction of the rotor gimbals and the hatches. introduction of the Rotorace principle permit random gyro wander to be kept well below one degree an hour, a considerable improvement over most compasses in general service today. The controller provides means for latitude compensation in the slaved or free gyro operation in either hemisphere. Hydraulic Systems Pump The Kellogg Division of American Brake Shoe The machines will embody the Labamatic principle Company, 530 Fifth Avenue, New York 36, N.Y., of constant frequency control, this being based on U.S.A., has announced a new hydraulic pump for electromagnetic coupling incorporated in the drive aircraft and missiles. Known as the AP10V, it delivers to the alternator shaft. Constant rotor speed is main approximately 27 galls./min. at 3,750 r.p.m. and tained by controlling coupling slip by means of an 3,000 lb./sq. in., with a maximum displacement of amplifier system and a frequency sensitive network. 1·77 cu. in./rev. Weight of the pump is only 17½ lb . The electromagnetic coupling may be employed in The AP10V is a single-stage, variable-volume, cam- conjunction with a variety of gear drive arrangements actuated pump with pressure compensator control. and these are essentially of a simple nature. In order Volumetric efficiency is over 95 per cent through a to improve efficiency an automatic two-speed gear box pressure range up to 3,000 lb./sq. in. The encapsulated seats have clam-type doors that is in some cases included in the drive. With this snap shut from the bottom and top to provide an addition an engine speed range of 3½-1 may be air-tight seal which eliminates the need for an oxygen obtained. mask or pressurized flying suit. Once clear of the First machine to be produced is a 4 kVA, 208 volt, aircraft a 34-ft. nylon parachute lowers the capsule 400 c.p.s. unit having a unity to 0·75 lagging power to the earth. Landing shock is absorbed by a large factor. When this alternator is coupled to a drive gas-filled rubber bag at the bottom of the seat. ranging from 2,900-8,000 r.p.m., the output voltage is Should the landing occur in calm water, the capsule maintained constant to within ±2· 5 per cent and the would float with the doors open, and on stormy seas, frequency to within ±2 per cent. Overspeed is per the capsule would remain closed and float indefinitely. mitted up to 9,000 r.p.m. for short periods. A pop-up radio antenna enables the crew member to transmit distress signals any time he desires. Spraymat Heaters for Helicopter More than 45 lb. of survival gear are packed With the full backing of the Ministry of Aviation, beneath the scat providing protection against Arctic D. Napier and Son, Ltd., Acton, London, W.3, and cold or desert heat. Westland Aircraft Ltd., Yeovil, Somerset, are now working on the design of a de-icing system for the Gyrosyn Compass Westland Wessex which will completely eliminate The Sperry Gyroscope Company Ltd., Brentford, partial shedding of ice formations. Middlesex, has now commenced production of the The system is based on Napier Spraymat electrical CL.11 series of Gyrosyn compasses incorporating surface heaters and at present the project is confined the 'Rotorace' principle. High accuracy is achieved to the design and testing of three sets of heaters for through contra-rotation of the gyro gimbal bearings, the main and tail rotors and the associated control first in one direction and then the other; this arrange and switching system. ment effectively averages and cancels out the bearing De-icing equipment for helicopter blades can pre torques which tend to occur due to the effects of sent special difficulties owing to the need to avoid friction, geometry, foreign matter and environment. out-of-balance force on the rotating mass of the rotor The tiny electric motor, which provides averaging assembly. motions, can be seen in the centre of FIG. 2 in asso All rotating parts are hydraulically balanced and All heaters for this project are being prefabricated ciation with the gear train and reversing switch. This the pump docs not require cither a universal drive or using epoxy resin and glass-cloth with Kumanal for compass is currently being manufactured by Sperry anti-friction type thrust bearings. A direct oil entry the conductor element. After balancing, the heaters in the U.S.A. and Canada as well as in the U.K., arrangement permits greater periods of cavitation will be attached to the rotor blades by Westland for both military and commercial customers. without noticeable wear, and high performance is Aircraft Ltd. The new equipment is fitted to (or is on order for) maintained under contamination conditions up to Each main rotor blade will have a Spraymat heater 40 microns. over the leading edge for a distance of 22 ft., extending almost to the tip. The outboard 10 ft., will be protected against hail, etc., by electroformed nickel cladding Transistor Speech Amplifier while the inner portion will have Napier Stoneguard A speech amplifying system has been designed by anti-damage coating. W.S. Electronics Ltd., Brunei Road, East Acton, The conductor elements of each heater will consist London, W.3, to provide information, commentary, of six legs parallel with the leading edge and running etc., for the benefit of aircraft passengers. the full length of the heater. At the outboard end, The amplifier is completely transistorized and these will be joined to a common return in the form operates from 28 volts d.c., the current drain being of a strip of copper foil embedded in the insulation only 1·5 amp when in use. As warming up time is of the heater. eliminated there is no stand-by condition, so that no current is drawn other than when the amplifier is Spring Pin being operated. Unbrako Socket Screw Co. Ltd., Burnley Road, The weight is only 5 lb., dimensions being 6½x4x Coventry, are now marketing a new self-locking 4 in. carbon steel spring pin, called Sel-lok. The output of 10 watts into a number of low level The principal feature of Sel-lok spring pins, speakers is adequate for the great majority of purposes. available in a complete range of standard sizes, is the The frequency response flat between 300-9,000 c.p.s. ease of installation. To use Sel-lok it is simply neces results in maximum intelligibility and natural repro sary to drill a hole and drive the pin in, thus eliminat duction, and transistorization eliminates background ing tapping and reaming. hum. July 1960 211
Aircraft Engineering and Aerospace Technology – Emerald Publishing
Published: Jul 1, 1960
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