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Aviation History
1920
1920 - 0776.PDF
Messrs. W. D. Oddy and Co., Ltd., Leeds. (STAND 80) A VERY representative collection of propellers make up the exhibit on this stand. Having confined their attentions solely to propellers this v firm have steadfastly refused to be drawn aside by the more profitable post-War activities, and have re- organised their works to meet the changed circumstances that peace has torooght about. One type shown, of their own design, of particular interest, is that of the Rigid Airship R.38. This pro- peller is one of those specially designed in view of the proposed Trans-Atlantic | flight of this ship, and has a number | of interesting features, one of them j being a lightning conductor connected p to the metal tip and leading directly '.•• to the engine boss. The propeller is built solely of Honduras mahogany, and is 17 ft. 6 ins. from tip to tip, probably one of the largest in existence. Another interesting propeller is the two-blader designed for the Alliance- Napier " Seabird," and which drove it on the famous non-stop flight from London to Madrid in 7J hours. This design awakened a good deal of interest at the time, and Messrs. Oddy are expecting big things from it in the future. A second Napier "Lion" airscrew exhibited is a four-blader made for a very different type of craft, being designed from the Hon. A. E. Guinness's coastal motor boat " Oma." Messrs. Oddy have in hand other aerial propellers for water-borne craft, and anticipate considerable develop- ments in this direction. A propeller still in the experi- mental stage is the recently patented adjustable and reversible one. It is aimed wjth this to alter the pitch of the airscrew whilst in flight, a privilege that will appeal at once to every pilot. If time permits a working model will be placed on the stand. Joseph Owen and Sons, Ltd., 199a, Borough High Street, London, S.E. I. (STAND 14) THIS firm are exhibiting all classes of timber suitable for aircraft construction, including coppice-grown English ash, prime clear silver spruce, mahogany and walnut for propellers, etc, American rock elm, cottonwood, cypress and canary whitewood, cedar panels, and 3-ply panels, etc. Palmer Tyre, Ltd., 119-123, Shaftes- bury Avenue, W.C. 2. (STAND 15) As might be expected of a house having such an exceptional record, the Palmer Tyre, Ltd., are making an extensive display of landiag wheels and tyres on their stand, and a characteristic exhibit is the electrically driven tyre-making machine as used in the making of Palmer tyre aero- plane tyres. The wheels and tyres on view range from 300 mm. by 60 mm. to 1,750 mm. by 300 mm. There is seen also a selection of Palmer aeroplane tyre accessories, wheel componets -and wheel rims. Visitors are able to obtain a souvenir booklet, " A Record of Success," with reproductions of some clever water-colour drawings by Mr. Geoffrey Watson. JULY 15, 1920 tube which slips over a plug and makes an airtight joint around same. The other end is closed excepting for a small hole on the top of a convex face on which rests a glass disc. Between this face and the glass disc a drop of oil is placed, and bubbles appear and indicate a leak. Another thing will be an electric cable terminal, which is claimed to be simple in construction more easily fitted, safer, and of longer life than other types. It is readily fitted without the use of tools, and once in position it will not pull off. Other specialities on view are the flexible pipe joint, petrol-cock, which has no rubbing parts, balloon winch cut-out, parachute hook attachment and quick release gear, piston-rings, valve-rocker and other engine parts, the Collins sparking plug, etc. Pettett's Patent Safety Filler Co.^ West Pier, Brighton. (STAND 75) THE use of Pettett's petrol filler makes it practically impossible to overfill the tank, as the petrol is auto- matically cut off when it reaches the A giant Palmer aero tyre Front and back views of the The Palnut Co., Ltd., 6, Great St. Helens, EC. 3. (STAND 86) THE Palnut is a safety lock washer in the form of a steel stamping, which is dished or coned engaging in a single thread of the bolt. The washer in varying dimensions is a running fit over and above the tolerances estab- lished for the thread to which it is adapted, and one of the hexagons is raised to conform to the chamfer of the same. When the nut has been sent home the washer is spun down to contact with the nut, two* threads sufficing to effect the purpose, and then a half-turn given the washer with a suitable spanner. The effect produced is that the hexagon flats are pressed tightly and cumulatively into the base of the pitch of the thread. This pressure is merely intensified by excessive vibration. A. E. Parnacott, PengeLane, S.E. 20. (STAND 34) ONE of the things on view is the sparking-plug tester, designed for the R.A.F. technical staff for demon- strating the gas tightness and sparking qualities of ignition plugs under pressure. It can test simultaneously four plugs under a pressure up to 150 lbs. per square inch. It consists of a cast-iron base and chamber into which the plugs are screwed, pump, magneto and gauge. The chamber has a glass face to show the sparking points. A patent leak detector is supplied which instantly shows if the plug leaks air. This leak detector is a 776 Parnacott sparking plug tester desired level, while the filter preventswater or foreign matter reaching the carburettor. ... Price's Co., Ltd., Battersea, S.W. 11. (STAND 5) THIS firm are showing samples of their Aero-Castor and Motorine Oils as supplied for lubricating the various makes of aero engines. There is on view, also,, samples of their solidified oil—Belmoline—for hot water pumps, screw-down grease- cups, etc., and gears and ball bearings ; An Oleo Aero Plug: No. 68,for radial and rotary engines
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