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Aviation History
1934
1934 - 0686.PDF
FLIGHT, JULY 5, 1934 Marconi's Wireless Telegraph Co., Ltd.—The Marconi stand comprised a display of new types of wireless transmitting and receiving apparatus for both military and civil aircraft, one of the Marconi " homing " instruments (type A.D. 32), a small attachment which can be affixed to almost any modern Marconi aircraft receiver, enabling it to be used as a direction finder, a Marconi-Newton constant- speed windmill for aircraft generators, and similar accessories. The transmitters and receivers included the type A.D. 37/38, suitable for both telephony and telegraphy on either medium or short wave lengths, the A.D. 41/42 adopted by Imperial Airways, Ltd., for use in their Short " Scylla " and " Syrinx " aircraft and the type A.D. 43/44, specially designed for high- speed fighting aircraft, providing them with the advantages of wireless contact between units in the air and with the ground, without seriously impairing their essential qualities of speed and manoeuvrability. M.R.C., Ltd.—A new form of remote control was shown by this company in its application to the rudder bias of the twin engine Airspeed " Envoy." This control, which makes use of a specially-wound cable having a raised helix on its outer circumference, has the advantage that rotary motion may, through its use,' be readily changed into reciprocating motion and vice versa. It may also be used for straightforward push-pull motion. , The Palmer Tyre, Ltd.—This company, which has done a very great deal of development work in connection with suitable wheels, tyres and brakes for aircraft, showed a full range of high and medium-pressure wheels and a com- prehensive range of brakes actuated by air and oil, and brake controls, including the Automatic Differential Action for steering. This, to a great extent, prevents the complication necessitated by the multiplying of controls normal^ asso- ciated with brakes, giving the pilot of the aircraft normal use of his throttle and flying controls. ": The Plessey Co., Ltd.—Four main exhibits—trans- mitting and receiving equipment Type A.C.44, an aerodrome receiver, a radio receiver for light aeroplanes and an aircraft short-wave receiver—were shown on the Plessey stand. The A.C. 44 is a combined transmitting and receiving equipment intended for use in commercial aircraft, and is designed to give a telephonic communication range of up to 180 miles, and a telegraphic range of 300 miles. The aerodrome receiver has been constructed to cover wavelengths between 500 and 20,000 m., and the light aeroplane receiver, which weighs 15 lb., to meet the requirements of the private owner who wants an equipment which will receive broadcast programmes and weather forecasts. Although no transmitter was shown with the short-wave receiver, entire short-wave transmitting and receiving apparatus for military and commer- cial purposes is being developed by the company. Reynolds Tube Co., Ltd.—A representative selec- tion of steel tubes to all specifications, including round and section tubing and examples of tube manipulation, was shown. One unusually interesting feature was part of a tubular rotor spar blade, recently manufactured for the Cierva Autogiro Company for use in the largest Autogiro now being built. The tube, which is in two sections, is taper gauge from end to end, commencing at ^ in. at the root and tapering to 12 gauge in the first section. The second section is 12 gauge tapering to 17 gauge. Joining is done by a special liner tube which telescopes into the ends of the two sections. The outside diameter of the spar is 2£ in. Seamless alumi- nium-alloy tubes and extruded and drawn sections, including machining rods, are manufactured by the company. The alloys on which it is concentrating are of the R.R. series, including R.R.56, for which a tube specification has now been issued, namely DTD. 220, and a specification for rods and bars—DTD. 210. This material, which shows an increase in strength of 25 per cent, over other aluminium alloys used in tubular form and as extruded sections, was shown in the form of tubing, manipulated tubes, and extruded sections. Rotax, Ltd. (Aviation Department).—Exhibits on the stand of this company were Watford magnetos, Rotax Eclipse aero-engine starters, generators and night-flying equipment, rotary transformers and hand-driven generators, and electric tools. Magnetos included examples for the " Kestrel," " Pegasus," and " Rapier" engines. Rotax Eclipse hand-operated inertia starters are now being supplied to the Government in large quantities. The typ2 Y.150 direct-cranking electric starter, which weighs 16J lb., has been standardised for use on the " Gipsy Six " engine, which it cranks continuously at 70 r.p.m. The starter is operated by a solenoid switch, the push button bsing located in the cockpit. An R.A.F.-type 12-volt, 5Ti-watt engine-driven generator being made for the Air Mini fry and for use in civil aircraft was also exhibited. The machine has to be driven at a speed of 5,000 r.p.m. and incorporates a cooling jacket to which air is fed by the slipstream through pipes. Rotherham & Sons, Ltd.—A selection of A.G.S. couplings, unions, filters, flanges, adaptors, and other special aircraft parts manufactured from brass and duralumin was the main feature. One of the more interesting products is a mechanical air pump, a special feature of which is that the lubrication is so arranged that one filling of oil lasts for at least two days. It is adjustable for pressure and gives a range between 1 lb. and 10 lb. All working parts are enclosed and protected from dust. .. . IN THE LINE : The first machine is the Westland G.P. monoplane, the Fairey G.P. and " Seal " and the Vickers " Vellox." 688 Beyond may be recognised (FLIGHT Photo.)
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