Aircraft Engineering and Aerospace Technology

1940 Aircraft Engineering and Aerospace Technology

doi: 10.1108/eb030661

THE principal feature of this month's issue is an extremely able paper covering a variety of aspects of the design and installation of aeroengines by two members of the staff of MESSRS. ROLLS ROYCE. This paper was read last year at the World Automotive Engineering Congress of the Society of Automotive Engineers in New York and we are indebted to the Society and the authors for permission to reproduce it here. It constitutes, as is natural, to some extent a defence of the liquidor, as the authors prefer to call it, the indirectlycooled engine. In England this is, of course, hardly necessary since it has always been felt here that there is room for both types and that any advantages the one may have for some purposes is counterbalanced by those of the other for different uses and it has consistently been the policy of the Air Ministry to encourage the development of both.

Hives, E.W.; Smith, F. Ll.

1940 Aircraft Engineering and Aerospace Technology

doi: 10.1108/eb030662

AT the outset we ought to say that we could probably have done more justice to a paper on the High Output cf AeroEngines.

Hounsfield, F.R.C.

1940 Aircraft Engineering and Aerospace Technology

doi: 10.1108/eb030663

THE first Handley Page wind tunnel was erected in 1916 and up to 1936 had produced a considerable quantity of data, a great deal of which was of a fundamental character, but, owing to the increasing performance of aircraft, its deficiencies were being felt, especially for the testing of complete models, although by employing partial models it was still of great use for tests on control surfaces.

de Bruyne, N.A.

1940 Aircraft Engineering and Aerospace Technology

doi: 10.1108/eb030664

CELLULOSE is a polar material held together by the strong secondary forces emanating from its OH groups. It can be swollen, dissolved or cemented together according to circumstances by a polar liquid like water or alcohol, while it is unaffected by nonpolar liquids such as benzene or toluene. It is rigid and relatively inextensible and strong.

Bennett, J.A.J.

1940 Aircraft Engineering and Aerospace Technology

doi: 10.1108/eb030665

THE calculation of the natural frequencies of oscillation of an articulated rotarywing system presents considerable difficulty owing to the large number of variables which require to be taken into account and it is proposed to consider first of all the simplified system of a mass rotating about a fixed axis and connected to it through two hinges, the axes of which are inclined to one another but lie in parallel planes perpendicular to the arm connecting the two hinges. In the next article an approximate method will be given of obtaining the natural vibrations of an articulated rotarywing system.

1940 Aircraft Engineering and Aerospace Technology

doi: 10.1108/eb030666

An explanation is given of the physical factors which govern the influence of the speed of sound on the drag, of an aeroplane, and on its performance. Observing the processes at the point of stagnation, the criterion for the compressibility influence is the Machs number, the introduction of which is also explained.

Pohlmann,

1940 Aircraft Engineering and Aerospace Technology

doi: 10.1108/eb030667

RAPIDLY interchangeable engine units for modern, large aircraft originated in the close cooperation between the industry and air transport. Such an interchangeable engine unit must satisfy a number of requirements

Hemingway, E.L.

1940 Aircraft Engineering and Aerospace Technology

doi: 10.1108/eb030668

IT would be interesting, if space permitted, to trace the improvements in machining methods and their relationship to the fits and clearances used in moving mechanical parts since the difficulties experienced by James Watt in building his first steam engine. Considerable water had gone over the mechanical dam from that time up to the development of the automobile. Yet, most of us will agree that the development of our modern machining methods has been mainly clue to efforts of the motor car manufacturers to produce a quieter, less costly, and more dependable product.

Weyl, A.R.

1940 Aircraft Engineering and Aerospace Technology

doi: 10.1108/eb030669

As the most common aeronautical timber is SITKA or silver spruce, its main deficiencies will be of special interest. The essential properties and defects appearing in converted timber, i.e., at planed surfaces rough portions are unsuitable for timber selection are as follows

1940 Aircraft Engineering and Aerospace Technology

doi: 10.1108/eb030670

INFORMATION has recently been released concerning two new power tools, developed in the United States, for the manipulation of sheet metal. Both these machines are particularly designed for the very accurate handling of the large panels which are becoming increasingly common in aeroplane construction. These machines, the makers claim, form a further step in the road towards the true mass production of aeroplanes necessitated by the modern demands of military aviation.