MR. LIONEL MOTE, who has been responsible for many translations from the German and French and summaries of foreign research reports that have appeared in AIRCRAFT ENGINEERING in…
Abstract
MR. LIONEL MOTE, who has been responsible for many translations from the German and French and summaries of foreign research reports that have appeared in AIRCRAFT ENGINEERING in past years, puts forward on another page a strong plea for what he describes as “ literary research.” It is almost unnecessary for us to declare our agreement with him because ever since we started this paper it has been our policy to make available to our readers in summarized form all that has come to us from sources both at home and abroad in the form of reports of the results of researches.
THE flow of gases in nozzles has been considered by many authors. The results are usually shown in the form of curves or tables of figures. Practical use of these diagrams or…
Abstract
THE flow of gases in nozzles has been considered by many authors. The results are usually shown in the form of curves or tables of figures. Practical use of these diagrams or tables is, however, made difficult by the large number of variables concerned and the difficulty of finding convenient scales.
SINCE so little information has been made available in this country with regard to Russian aero‐engines, it was thought worth‐while to attempt to compile a description of this…
Abstract
SINCE so little information has been made available in this country with regard to Russian aero‐engines, it was thought worth‐while to attempt to compile a description of this engine, although it was first produced at least fifteen years ago. This description is necessarily incomplete and to some extent disjointed because most of it is based on references contained in the book Aero‐Engines—Design and Detail Calculations, edited by A. E. Zaikin, of the Joukowsky Military Aviation Academy of Kiev, and published in 1941 by the State Publishing House of the Defence Industry. This book was not intended to describe any one engine but rather, to indicate the merits and demerits of various components of many engines including English, American, French and German products. It is known that most of the aero‐engines produced in Russia are of foreign origin and for this reason it was assumed that interest would be taken in the AM.34 which does appear to be of Russian design.
IN modern times, increasing emphasis is being laid on specialization and there is so much research being made into the many intricate details of the most abstruse problems that…
Abstract
IN modern times, increasing emphasis is being laid on specialization and there is so much research being made into the many intricate details of the most abstruse problems that members of one group of engineers are too often unaware that their own problems, or others closely related to them, have already been investigated.
SINCE the first successful flight tests were made with the Escher Wyss airscrew some years ago, this type has been distinguished in this sphere by several fundamental innovations…
Abstract
SINCE the first successful flight tests were made with the Escher Wyss airscrew some years ago, this type has been distinguished in this sphere by several fundamental innovations . From the beginning a very high speed of adjustment of approximately 8 deg./sec. was attained in normal operation as an automatic, constant‐speed airscrew. This property and the wide range of speed control between 100 per cent and approximately 40 per cent of the rated r.p.m. made it possible completely to release the pilot from control of the airscrew. Thus the problem of the automatic airscrew was finally solved (Fig. 1). That this solution was satisfactory has been proved by many years' service under the most stringent conditions in the Swiss Air Force.
TO those who have grown up with aeronautics the name of General Crocco is almost a legendary one, and he is in historical fact contemporary with the Wright Brothers since his…
Abstract
TO those who have grown up with aeronautics the name of General Crocco is almost a legendary one, and he is in historical fact contemporary with the Wright Brothers since his investigations into the subject date from the very beginnings of the century, as is evidenced by the fact that he took out his first patent on the control of aeroplanes in 1903. He followed this in the ensuing year with a famous paper on the stability of airships read before the Academie des Sciences, and one on the theory of aeroplane flight; while the catholicity of his early interests is further shown by his association with Ricaldoni in a series of experiments with airscrews mounted on a hydroplane, for the construction of which he was partially responsible, on Lake.Bracciano in 1907. When it is recalled that in 1906 he was concerning himself with the phenomena of auto‐rotation in connexion with helicopters, the breadth of his out‐look on aeronautical problems, and his astonishing prevision, is manifest. For many years he was, of course, chiefly known for his association with a series of ingeniously designed semi‐rigid airships produced by the Italian Government, but his interest in heavier‐than‐air flight throughout his career found outlet in innumerable articles. In recent years he has been particularly associated with the allied phenomena of stratospheric and supersonic flight; as witness his paper entitled ‘Flying in the Stratosphere’, which we had the privilege of publishing in Aircraft Engineering in July 1932.
J. Girard and M. Delière
THE Flight Testing Department of the Société Nationale de Constructions Aéronautiques du Sud‐Ouest (S.N.C.A.S.O.) has, in collaboration with the Société Delord, developed a new…
Abstract
THE Flight Testing Department of the Société Nationale de Constructions Aéronautiques du Sud‐Ouest (S.N.C.A.S.O.) has, in collaboration with the Société Delord, developed a new method of measuring and recording the variations in the electrical resistance of resistance type extensometers, known as strain‐gauges, in their various applications.
In contrast with previously known methods of calculating the volume of rocket combustion chambers which are concerned with a ‘characteristic length’ to be determined…
Abstract
In contrast with previously known methods of calculating the volume of rocket combustion chambers which are concerned with a ‘characteristic length’ to be determined experimentally for each fuel and for each injection system, it will be shown that there is available: (a) a generally valid qualitative theoretical relationship between the combustion chamber volume VC and any desired combustion pressure, mass flow, fuel and combustion chamber shape. (b) a generally valid relationship, for practical design purposes, between the combustion chamber volume VC and any desired combustion pressure, mass flow, fuel and combustion chamber shape. Further, the theoretical results will be compared, by means of examples, with combustion chambers which have been tested in practice. Moreover, the important fact will be indicated that the formula proposed in this article must, in principle, also be applicable to the calculation of the volume of the gas turbine combustion chamber.
IN the years preceding the last World War, before it was concerned with the problem of the gas turbine, the Société Rateau dealt, with some success, with the very important…
Abstract
IN the years preceding the last World War, before it was concerned with the problem of the gas turbine, the Société Rateau dealt, with some success, with the very important problem of blower equipment for marine boilers. This is a problem having marked analogies with that of the supercharging of aero‐engines. It is, however, more spectacular owing to the incomparably greater power involved and more particularly because the size of the engines is of the same order as, or greater than, that of the gas turbine. This made possible a close study of all the problems presented by the latter type of power unit.
THE IMPORTANCE OF DILUTION FOR TURBO‐JETS The S.R.A. 1 turbo‐jet engine is of the ducted‐fan‐type. This arrangement seemed the best at the time when the problem (of good…
Abstract
THE IMPORTANCE OF DILUTION FOR TURBO‐JETS The S.R.A. 1 turbo‐jet engine is of the ducted‐fan‐type. This arrangement seemed the best at the time when the problem (of good performance) was presented, and the results obtained have since confirmed the original expectations. Most other turbo‐jets, however, if not all, are now of the undivided‐flow type.