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Aviation History
1934
1934 - 0853.PDF
AUGUST 16, 1934. FLIGHT. 855 engines on the ground, and in the higher altitudes there has to be a consider- able difference in the mixture to keep the engine running smoothly and giv- ing its best power. Carburetters are, therefore, an extremely important part of the engine. H. M. Hobson will be showing their many forms of Claudel Hobson carburetters, particularly those which are fitted with the Hobson Penn automatic mixture control, a fitment The Siddeley " Tiger IV"develops 700 h.p. at 2,150 r.p.m. The Siddeley " Panther VII " is rated at 560 h.p. at 5,500 ft. A sectioned " Pegasus " cngin2 on exhibition at Copenhagen. The power of the different models varies from 600 to 700 h.p. which maintains the correct mixturefor all conditions and at all altitudes. Very little less important, perhaps,are sparking plugs. In some cases, these have to work satisfactorily invery hot engines and under very severe conditions, particularly when theengines are supercharged. Both the well-known firms of Lodge and K.L.G.are showing the best plugs which British industry can produce. More and moreas commercial aviation becomes used by '. the travelling public, has it been foundnecessary to run air lines through weather which has hitherto been lookedupon as too dangerous, but modern wire- less equipment has eradicated a largeproportion of this danger by enabling machines to be given their exact positionfrom ground direction-finding stations, although the pilot in the machine maynot be able to see anything on the ground at all; and also by the controlofficer at aerodromes being able to warn pilots and to prevent them running therisk of colliding with each other. The name of Marconi is, of course, associatedwith wireless in everyone's mind, so it is not surprising to find that this firm isone of the most prominent in the supply of apparatus for use in the air and onaerodromes. Apart from various forms of transmitting and receiving sets, likethat used by Imperial Airways, there are also other interesting devices for especialpurposes, one of which, the Marconi Homing device, has been described atlength in our pages. (November 30, 1933) Another form of equipment which hashelped to make running air lines a com- mercial proposition, is that installationwhich enables machines to be flown safely at night. Rotax will, in this con-nection, be showing the various kinds of navigation lamps, switch boxes, etc.The same firm also produces magnetos, and a particularly neat electric startermotor by means of which it is possible to start the engines from the cockpit, bypressing a button, thus doing away with swinging the airscrew by hand. Pilotswhen flying in fog or under conditions when they cannot see the ground, re-ceive a great deal of help, as we have already mentioned, from wireless equip-ment, but they have also to have quite a number of instruments which are vir-tually a substitute for the horizon which they cannot see. Both Smith's Air-craft Instruments and Short & Mason are exhibiting not only instruments forthis purpose but also all those which tell the pilot exactly what his enginesare doing as well. The former firm is also showing a variety of equipment forsupplying oxygen to the pilot in military aircraft when flying at very high alti-tudes. Vickers display consists of fittings foroil, fuel and water systems, and also specimens of their wheel Brakes and oleocompression struts for undercarriages. In Flight for May 17 last, we des-cribed a new camera gun produced by the Williamson Manufacturing Co. Thiswill be shown in the exhibition both made up to resemble a Lewis gun, sothat it can be used on the standard gun ring by the observer, and also designedto be fixed to the wing of an aeroplane when used in single seater fighters orthose aircraft which have fixed guns firing through the airscrew. The samecompany also makes Eagle aircraft cameras with which the Danish RoyalAir Force is equipped. The Cirrus-Hermes II is rated at110 h.p. The Cirrus-Hermes invertedengine develops 120 h.p. 2* Cylinders : The Napier"Dagger" has its cylinders arranged in four banks of 6 each.It develops 675-700 h.p. The Rolls-Royce " Kestrel VI " a rated at 600 h.p. at 2,500 r.p.m. and 11,000 ft.
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