352 AIRCRAFT ENGINEERIN G December, 1929 Recent Technical Developments Applying Metal Protective Coatings by the Spray Method— Ligh t Aeroplane Wireless—Aluminium Castings Spraying on Coatings still carry on a conversation and can also both receive signals picked up by wireless. NE W method of applying a protective I t is suggested that the set has uses in the coating to materials, metallic or non- later stages of instruction when the pupil has metallic, as an alternative to the electro arrived at "solo" flying. Speaking from a lytic, is being introduced into England. The transmitte r on the ground the instructor can system, which has for some time been in use in correct any faults he sees made by the pupil Germany and America, is being marketed here in the air and help him in making first landings. by Metals Coating Co., Ltd., It consists in The pupil will hear the instructions through the spraying the coating on to the surface to be headphones in exactly the same way as when protected by means of a special form of pistol, the y came from the voice pipe, which should known as "Metalayer." This pistol, as can aid in engendering confidence. During a be seen from the illustration, is connected by recent test, signals from Croydon were heard rubber hose to oxygen and acetylene cylinders in a "Moth " aeroplane right up t o Manchester, and to a compressed air tank. The metal a distance of nearly 200 miles, a t good strength. to bo deposited is used in the form of ordinary The set is being demonstrated a t Heston Aero commercial wire, and any metal that can drome, near London. be drawn into wire can be applied. The wire enters the pistol at the back, and is fed automaticall y from a reel through the nozzle, "Modified " Aluminium Castings where it meets the oxy-acetylene flame in Rowland Hill & Son, Ltd., of King Street, combination with compressed air, and the Coventry, send a booklet on their "Alpax" atomised metal is blown on to the surface at a velocity of some 3,000 ft. per second. In this aluminium alloy for sand castings. "Alpax" way, a zinc coating can be applied to aluminium, is an aluminium-silicon alloy modified by a as has been done to "Jaguar " engine parts patented process involving the addition of experimentally. In the same way, aluminium metallic sodium or sodium salts under defined itself, which is largely used in America as a conditions to the melt. It contains 10 to primary coating for aluminium alloys prior to a 13·5 per cent. silicon, the remainder being final covering with zinc, can be sprayed on to aluminium. It can be substituted for Speci Modern Tube Developments duralumin. Aluminium does not, of course, fication 2 L . 5, and for 3 L. 11, when the latter is From Messrs, Accles & Pollock, Oldbury, lend itself to application by the usual electro- used as a general alloy for such details as Birmingham, has been received an illustrated deposition methods and, therefore, this system induction pipes, supercharger parts, water catalogue, "Make it with Tubes," which well offers a way of surmounting the difficulty and pipes, etc. Though it bends or deforms under shows the complicated forms of bent tube that giving a coating to Duralumin which is, in load more easily than 2 L. 8 or 3 L. 11, it is can be formed with modern methods. The itself, more capable of resisting corrosion. claimed to be more difficult to break or crack. aircraft components and accessories pictured A heat-treated coating of aluminium can range from screw pickets and wing struts to a also be applied to steel engine manifolds and complete series of induction pipes and exhaust Mail Dropping Parachutes exhausts by the pistol—this process being collectors for a radial engine. Weldless steel known as "Alumetising." This method is tub e drawing has developed into a method of Th e A.G. fur Ausbentung der Patente said to give a practically unscaleable finish up to manipulating steel to almost any conceivable Kunzer, of Basle, Switzerland, have produced a a temperature of 1,000 deg. C. The coating can shape. The tubes can be butted, tapered, series of "Meteor" parachutes fitted with be applied, it is claimed, from thickness of expanded or reduced, flanged, domed or beaded, automati c time release apparatu s for delivery of 0·001-in. upwards. trapped or lapped—to mention but a few of mails from the air, or the dropping of parachute some twenty or more forms of manipulation flares. Before releasing the parachute, which is Tha t the method is not confined to engine now carried out by this firm. packed in a basket-like container, the pilot sets parts, but can be adapted to portions of the a clockwork mechanism, according to his height, air frame itself, is shown by a photograph sent us of a number of aeroplane struts so which opens the parachute at a sufficient treated. distance from the ground to give a slow descent Wireless for Light Aeroplanes for the last 300 ft. or so. This, it is claimed, Graham Amplion, Ltd., of St. Andrew's enables him to ensure the arrival of the contents Works, Slough, have brought out a new wireless a t a desired spot on th e ground with considerable receiver specially adapted for light aeroplanes, precision. "Shakeproof " Lock-washers utilising as part of the installation the voice Messrs. Barber & Coleman, of Man pipes normally fitted for instructional flying. chester, send details of the "Shakeproof" lock- The receiver itself weighs just under 4½ lb. An American Tachometer washers introduced by the Illinois Tool Works, and measures 5½ in. by 4¾ in. by 8¾ in. only, Barbou r Stockwell Co., of 205, Broadway, Chicago. The washers consist of rings with a the total weight of the complete apparatus Cambridge, Massachusetts, offer to send to series of twisted teeth set at equal intervals being less tha n 20 lb. A single tuning control is an y reader a copy of their 1930 Booklet No. 11, round the edge of the washer, either internally used, the tuning range being 600-1,000 metres. giving full particulars of their "Reliance" or externally according to requirements. As There are ,two screened . high-frequency stages tachometers and instrument panels. The tacho th e nut is tightened, the teeth tend to bite into in front of a detector with one transformer meter is centrifugal in operation, with a three- both the nut and the "work." The teeth can outpu t stage. The screened battery box weight governor running in ball-bearings, and be either flat or countersunk, and are adaptable contains minute high- and low-tension batteries, can be supplied with either direct drive or t o various purposes, in addition to their ordinary the battery feed being supplied to the receiver internal gearing. The model F tachometer is purpose, as simple washers. They are, for through a single-screened multicore cable. The specially designed for aircraft with a dial giving instance, applied to provide "Shakeproof" receiver is slung in shock absorbers. The readings from 200 to 2,400 r.p.m. terminals for electric wiring. In this application machine itself is used as the "earth," and cold-rolled, hardened and tempered cadmium- the fixed aerial is carried from the wing-tips plated ends are used with the teeth slightly to the tail in such a way as not to interfere twisted, so that thin sharp corners press into with the folding of the wings. The outpu t leads Roya l Aeronautical Society the nut and the terminal. It is claimed that of the receiver are connected to a light loud I t is announced that the lecture by Sig. J. de vibration or additional turning or twisting speaker movement built into the normal bye- la Cierva on "Recen t Work on the Autogiro," must cause the teeth to bite deeper into the pass unit of the voice-pipe system. By this arranged for December 5, has been postponed metal and form a more positive lock. arrangement the occupants of the machine can till th e new year.
Aircraft Engineering and Aerospace Technology – Emerald Publishing
Published: Oct 1, 1929
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.
Read from thousands of the leading scholarly journals from SpringerNature, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera