FlightGlobal.com
Home
Premium
Archive
Video
Images
Forum
Atlas
Blogs
Jobs
Shop
RSS
Email Newsletters
You are in:
Home
Aviation History
1951
1951 - 0812.PDF
FLIGHT, 27 April 1951 5O7 TECHNICAL and INDUSTRIAL Recent Developments at Home and Abroad Flight-test Penmanship IN an effort to avoid the time-wastage involved in transcribingthe results of automatically filmed test-instrumentation, the Boeing Airplane Company have developed a six-pen graph-typerecorder. On a 150ft moving length of graph paper the pens simultaneously trace time intervals, air speed, angle of pitch,normal acceleration, elevator position and elevator hinge-moment. Other functions could be recorded as required, and there wouldseem to be no reason why the apparatus should not be capable of extension to make a simultaneous record of any practicable numberof variables. The first unit had a paper movement of ioin/min, but a later model has four speeds ranging from i\ to 75in/min. Self-aligning Thrust Bearing AN ingenious method for providing sorre degree of self-aligning• function in conjunction with an otherwise normal ball thrust- bearing has, as already mentioned in these pages, been developed by Avro Canada, Ltd., and is to be used in the Orenda turbojet. The inventor is Winnett Boyd, lately chief designer, gas-turbine division, Avro Canada, and now practising as a consulting engineer in Toronto. Patent rights of the bearing have been assigned to Canadian Patents and Development, Ltd., of Ottawa. SPRING PLASTIC RING BEARING HOUSING Details of the Avro Canada self-aligning thrust bearing. The drawing above now discloses that the essence of thedesign is that thrust loads transferred from the shaft through the bearing to the bearing housing are taken on an incompressible butdeformable ring of plastic material fitted between the bearing housing and the enclosing frame. The incompressibility of theplastic resists thrust, while its deformability accommodates any slight misalignment of the shaft. Small coil springs between theclosure plate and the bearing housing serve to maintain the latter in contact with the plastic ring, whilst dowel pins between the closureplate and the bearing housing prevent the housing from creeping round in sympathy with shaft rotation. Aviation Films t"ROM time to time Flight receives enquiries from flying clubs,A engineering societies and other organizations as to where they may borrow cinema films on aviation subjects. In this connection,the 1951 catalogue recently issued by Petroleum Films Bureau (29, New Bond Street, London, W.i) should prove helpful. Thecurrent list of aeronautical subjects, all available on 16 and 35 mm sound, includes the now well-known How an Aeroplane Flies(six parts) and the four notable records of the S.B.A.C. Displays of 1946-1949. Rotary-wing flight is dealt with in The History ofthe Helicopter and Night Hop, and among films with a primarily technical emphasis are A Single-point Fuel Injector and The Rolls-Royce S.U. Single-point Pump—General Maintenance. In addition, there is an extensive selection of films on thepetroleum industry, on motoring, and on various engineering subjects. All films are loaned on condition that they are exhibitedonly to non-paying audiences. The Boeing flight-test recorder referred to in the adjacent paragraph Improved Small Cock AN improved type of small cock for instrument connections,- pneumatic and hydraulic services, drains and similar applica- tions is announced by Richard Klinger, Ltd., Klingerit Works,Sidcup, Kent. Known as the AB.IO, and intended to replace the taper-plug type of cock, it makes use of the firm's sleeve-packedprinciple, whereby the number of components is reduced to five—as against seven in an earlier design—and a satisfactoryseal assured. The plug is of parallel form, ground to size, and operates withina renewable sleeve of Klingerit resilient compressed asbestos built up in layers. A ridge on the exterior of the sleeve prevents it fromturning within the brass body, and stainless-steel eyelets line the two ports which, when the tap is in the op«i position, register inthe normal fashion with the aperture through the plug. These The new Kliheer AB.IQ cock in pSrt section, showing the compressed - asbestos sleeve and simple assembly. eyelets prevent the asbestos being squeezed into the ports underpressure of the gland nut at the top of the body or the tightening- nut below; also, the fact that they are conical in section causes ttuasbestos to be more tightly compressed round the plug when the lower nut is tightened. These AB.10 cocks, it is stated, are tested to 1,000 lb/sq inpressure, and are available in six different patterns with a bore of A in and a variety of union diameters. Prices are said to be com-parable with those of orthodox taper-plug cocks. New Etching Primer ETCHING primers as used in pre-treatment of non-ferrousmetal and plastic surfaces before painting normally consist of two separate compounds, the etching acid and the primer,which are mixed immediately before use. From Federated Paints, Ltd., Strathclyde Works, 17 DavidsonStreet, Glasgow, S.E., come details of a new ready-mixed primer, supplied in a single container. It is stated that no "jelling" actiontakes place between the etching and the varnish media, so that the
Sign up to
Flight Digital Magazine
Flight Print Magazine
Airline Business Magazine
E-newsletters
RSS
Events
