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February, 1942 AIRCRAFT ENGINEERING 31 of the D.H. four-bladcd and the Rotol contra-rotating types. When wc receive, as in these instances, a number of articles sub Aircraft Engineering mitted for publication all dealing with the same subject, it is not difficult to guess the trend of thought that is occupying aeronautical Devoted to th e Science an d Practice of Aero minds. It is, of course, the rapidly increasing curves of aeroplane nautic s and to Allied and Subsidiary performance in speed and altitude that is bringing heavy pressure to bear on the airscrew designer to do something to meet the urgent Branche s of th e Engineering Industry needs for better and better methods of utilizing to the full the horse Editor: Lieut.-Col.W.Lockwood Marsh,O.B.E.,F.R.Ae.S.,M.S.A.E.,F.r.Ae.S. power available in all conditions of flight. In the introductory paragraphs of the various articles we have mentioned will be found Vol. XIV, No. 156 February 1942 indications of what methods are being considered to fulfil these ever-increasing requirements. Reversion to Type Those who arc familiar with the early history of aeronautics are noticing with a certain degree of amusement how once again the PART from developments which may be taking place in wheel of progress has turned full circle and come back, as solutions other countries, the fact that in Italy the Caproni-Campihi to present troubles, to the four-bladed and " double " airscrew; jet-propulsion aeroplane has reached the practical flying stage both of which were comparatively familiar features in the early and has already carried out a number of cross-country flights— days. How far these devices will serve to stave off the day of the one photograph that has been reproduced over here shows it over necessity for the introduction of the two-speed gear remains to be the centre of Milan—brings this type of airscrew-less machine defi seen. We well remember some eight or nine years ago being taken nitely into the picture. Wc arc, therefore, publishing in full, complete to task for our advocacy in these columns of the variable-pitch with all the illustrations found in the original, a Ministry of Aircraft airscrew and it begins to look as if, after all, we were perhaps merely Production translation of a series of articles which appeared in the protagonists of a stop-gap. Sadder still, however, if the vari he German paper Flugsport in January and February, 1939. able gear does materialize will be the position of those who, in the recent past, have spilt so much ink in explaining to the simple A Comprehensive Guide that the variable-speed airscrew corresponds to the gears of the We are aware that portions of these articles and some of the motor-car. Even worse, perhaps the whole combination is doomed illustrations have already been used elsewhere as the basis of to be ousted by the jet propulsion of which wc have written above. articles on the subject, but the German review is so comprehensive— and indeed complete—that we feel it is only right that full credit should be given to the author by this verbatim reprint of it in DATA SHEETS translation form for English readers. This accords well with the Owing to the prohibition laid on the inclusion of loosely inserted policy we have always followed of publishing from time to time as matter in the paper of periodicals, wc some months ago gave up complete a summary as possible of one or other aspect of aero the publication of the series of data sheets which had become a nautical development; while it also carries on our wartime practice regular and, we were led-to believe, much appreciated feature of of making a feature of translations from the foreign, and particularly AIRCRAFT ENGINEERING. We have lately, however, been recon the enemy, technical press. It is abundantly evident that an sidering the matter, and have decided to revive this feature, though enormous amount of painstaking research work among the patent not, we fear, in quite so convenient a form as before. We are unable, specifications of almost all countries must have preceded the com for the reason we have explained above, to print these, on separate pilation of the articles, while the summarizing of the innumerable sheets of cartridge paper suitable for keeping in a binding case or specifications has clearly been a most laborious process. The for pinning up on a wall. We feel, however, that even when forming result is a guide to the relevant information on jet propulsion which part of- the ordinary issue of this paper they will be welcome and will be of infinite value to all future research workers in this field readers may care to tear them out for future reference, in spite of and we are glad to be able to make it available to those who are the inevitable drawback that there will be printing also on the back. unable to take advantage of it in the original. We restarted the series last month with an augmented list of the conversion factors which were first published in these columns in A Past with a Future 1931 and which are, exceptionally, available separately on a smal! card with a cord for hanging. This month we follow with a chart Jet, or " reaction", propulsion is one of those dreams which have of the mechanical properties of light alloys, which will not be haunted the mind of inventive man all down the ages—long before available in any other form. We propose to continue with a feu the appearance of the aeroplane, or the internal combustion engine others which had already been prepared when we had to abandor which made it, and perhaps both, possible. That it is now, at long the project and which, therefore, we had by us. We shall be glad last, becoming a reality is due to many and varied developments of suggestions for future issues and shall be willing to purchase foi in connexion with the details of cooling and other ancillaries publication any data sheets which readers may care to submit of power-driven flight. All honour to those who have had the and which arc considered suitable for the purpose. A full list o. wit to see the direction in which progress was tending and resuscitate those previously published can be obtained on application to tin from the past a subject which had come to be looked upon as Editor. merely a vision of cranks. It is too early yet to say what prospects in efficiency, both at altitude and near the ground, the system offers in comparison with DESIGNING FOR MACHINABILITY the airscrew-engine combination; but so much research and This series of articles by MR. THOMPSON, reprinted by courtes} experiment is being conducted at the present time in various parts of the Editor of Aero Digest, has aroused widespread interest anc of the world that it clearly will not now be long before we shall we have received a number of requests to make them availabL have some reliable data on which to form an estimate. It is a separately. We arc, therefore, making arrangements for this an< development which, like several others, is going to make the future it will shortly be obtainable as a 12-page pamphlet of the sam very interesting. dimensions as the pages of AIRCRAFT ENGINEERING. The pric will be 2s. for single copies, or Is. 6d. each if ordered in quantitie of 25 or more. It will greatly help if orders could be sent in earl; THE DANGERS OF PROPHECY so that an idea of the number required can be gained; as the editio: As the pages of recent issues of AIKCRAFT ENGINEERING have cannot be unlimited and the quantity printed will necessarily, owin, shown, the airscrew is very much in people's minds at present. In to the paper shortage, be restricted. the last three months we have published articles on "The Dynamic Balancing of Airscrews", " Blade Stall During Take-off",- with a TliR fact that k'oodi made of raw materials in short supply owing to war conditions arc advertised in AIKCRAFT KNGISEEUING should not be taken as an indication that they are return' to the subject in the form of correspondence this month, necessarily available for export. and "Airscrew Performance Estimation " as well as descriptions
Aircraft Engineering and Aerospace Technology – Emerald Publishing
Published: Feb 1, 1942
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