FlightGlobal.com
Home
Premium
Archive
Video
Images
Forum
Atlas
Blogs
Jobs
Shop
RSS
Email Newsletters
You are in:
Home
Aviation History
1932
1932 - 0773.PDF
FLIGHT, JULY 29, 1932 work to keep a larger plant continu ously occupied the Aerograph Co., Ltd., have produced a model desig nated as Type A.D. It is a portable unit, small and therefore easy to handle, and there is an electric model and a petrol model, the latter costing slightly more. It accommodates a standard Aerograph spray gun, and is particularly useful in a mass-produc tion factory for dealing with urgent work that cannot conveniently be done with the main spraying plant. The secret of successful spraying is largety contained in the application of even pressure. In its capacity for operating a standard spray gun, Type A.D. model represents a successful solution to the problem of how to pro vide an air compressing outfit produc ing the necessary uniform pressure for such a gun at a low price and of reasonable proportions. This new unit consists of a petrol engine (or electric motor), air compres sor, air receiver, moisture and oil separator, chassis and drive, and the spray-painting equipment. The petrol engine is 1.3 h.p., single cylinder, two stroke, consuming 1.3 pints per b.h.p.- hour and 0.04 pint of oil per b.h.p.- hour. It is lubricated by the simple petroil system, the proportions of the fuel being a quarter of a pint of oil to one gallon of petrol. The engine is hopper-cooled and a centrifugal governor is fitted to control the car buretter throttle. Ignition by flywheel magneto pro vides easy starting and running under all conditions. For the electric model the motor used is of 1 h.p., complete with a length of cable and plug adapter. The air compressor is of a vertical single-acting, twin-cylinder type, air cooled, with aluminium pistons, drop- forged duralumin connecting rods, and crankshaft of the best-quality steel. The valves are of the flat disc type made from special non-rusting valve steel. The displacement at 960 r.p.m. is 6.98 cu. ft. per min., providing ample capacity for the continuous operation of a full-size Aerograph spray gun without drop in pressure. The air receiver is a steel tank with stoutly-welded seams, fitted with safety valve, pressure gauge and drain cock. It is tested to a pressure of 100 lb. per sq. in. As compressed air always contains an amount of moisture, oil and dirt, which must be removed to ensure a satisfactory finish when spraying, an Aerograph Type M.C. separator is therefore fitted to the outlet of the air receiver. A supply of clean dry air at the spray-gun is thus made certain. The interior filters can be very quickly changed. The chassis carrying this equipment is a steel trolley fitted with a convenient push-bar. Two of the four wheels are of the roller-bearing swivelling type, providing easy move ment and control. With the Superplus spray-gun, which is supplied as standard, is a half-pint colour container, which can be cleaned quickly when a change of colour is required, and a 25-ft. length of f-in. air hose, giving ample working radius from the plant. Normally, a spray-gun should operate at a pressure of from 35 lb. to 45 lb. per sq. in. By simply turning The Aerograph "XL Superplus" spray gun with a readily detached colour container making rapid changes of colour an easy matter. the air cap with the fingers the gun should produce either a wide fan spray for large surfaces or a round concen trated spray for smaller surfaces, an absolutely uniform pattern being obtained in both cases. The flow of material is controlled by a needle valve seating in the nozzle of the gun with perfect accuracy. This needle valve permits the operator to start and stop the flow of colour gradually, and to apply a thick, thin or medium coating by simple manipulation of the trigger of the gun. It also prevents the risk of spitting or dripping, and is indis pensable for working round mouldings of motor-car bodies and similar work. To show the variation possible with a gun fitted with a needle valve, marred spots the. size of a small coin can be touched up and, in the other extreme, a band of paint can be applied 4 in. to 8 in. wide at each stroke. It is reasonably claimed that from 40 to 50 sq. yd. per hr. can be perfectly painted with a spray-gun by one man, while much higher speeds of work are com monly attained. A gun must produce a soft, perfectly-atomised wet spray, with the material evenly distributed over its entire area. The Aerograph Co., Ltd., have city offices and showrooms at 43, Holborn Viaduct, E.C.I, where an interested visitor may inspect several types of their plant. (Tel. Holborn 1257-8-9.) AVIATION AND THE AUTOMOBILE ASSOCIATION THE 27th Annual Report of the •*• Automobile Association, which was presented at the Savoy Hotel on Wednesday, July 20, disclosed the fact that the Aviation Department has made steady and continued growth. Of particular interest in this depart ment is the flying map library from which members may hire maps for the route over which they wish to fly. Arrangements have also been con cluded with Airwork, Ltd., whereby stocks of these maps are carried both at Heston Airport in this country and Cairo, in Egypt. Not only are these maps used by private owners, but also by those making record attempts, and a very large number of the long distance record flights made during the past twelve months have used infor mation and maps supplied by the A.A. The A.A. wireless broadcasting station was opened at Heston in September (described in FLIGHT for July 15), and has since been sending out daily weather reports, which have proved of great value to pilots all over the country. Members of the Association staff have also carried out a large number of examinations of aerodrome sites, and the growth of aviation may be gauged from the increase in the number of applications received for reports on sites proposed as aero dromes. CASE HARDENING •"THE Cassel Cyanide Co., Ltd., of *• Oldbury, nr. Birmingham, which is a subsidiary company of Imperial Chemi cal Industries, Ltd., has issued a book let describing the modern methods of case-hardening, and bringing to general notice the particular method of case- hardening usually known as Cyanide- Hardening. The cyanide process differs from pack-hardening in that, instead of employing a compound in the solid state as the means of introducing the carbon, the case-hardening agent is used in the molten state. Results de rived from this change, states the booklet, are a saving in labour, unifor mity of product, freedom from distor tion, exfoliation is eliminated, there is exact temperature control, and, finally, a clean bright finish. SUMMER THUNDERSTORMS A VERY useful and interesting pamphlet is the Census of Thunder Storms in the British Isles. 1925-1936, First Annual Report, 1931. Mr. S. M. Bower, of the Royal Meteorological Society, 49, Cromwell Street, S.W.7, points out that this year the expense of this census has been met in part from voluntary con tributions from observers and by the sale of the report, but between 1925 and 1931 was financed by him person ally. He expects that the results of the census may profitably be utilised in aviation, electrical or transmissional engineering as well as in insurance, and he hopes that people interested in these matters will contribute an ade quate sum to the funds of the organi sation responsible for the collection of the data. The census is the result of the observation of 966 voluntary ob servers and organisations throughout the British Isles. It is interesting to note that from April-September the areas affected by thunderstorms are almost entirely confined to England itself, leaving Scotland and Ireland comparatively free, whereas from October-March the reverse takes place. 717
Sign up to
Flight Digital Magazine
Flight Print Magazine
Airline Business Magazine
E-newsletters
RSS
Events
