Aircraft Engineering and Aerospace Technology

1945 Aircraft Engineering and Aerospace Technology

doi: 10.1108/eb031272

OBSERVANT readers will notice that with this month the title of our Workshop and Production Section has been altered to Production and Maintenance Section. This is not just chance, nor an editorial whim, nor even a preference for a phrase which rolls more pleasantly off the tongue, but a deliberate choice indicative of a change in outlook and, in some sense, a sign of the times.

Drury, G.W.

1945 Aircraft Engineering and Aerospace Technology

doi: 10.1108/eb031273

CASTORING stability requires automatic return, after displacement, of the castoring wheel to the central position. A hinged wheel may be automatically stable under static conditions, but dynamically unstable, or vice versa. Dynamic stability may be defined as the condition in which the forces on the wheel in motion secure its return to the path of direction of motion.

Heywood, R.B.

1945 Aircraft Engineering and Aerospace Technology

doi: 10.1108/eb031274

IN Part I, some aspects of the technique of stress determination by photoelastic analysis were recommended which, it was considered, would overcome certain difficulties. Let us now have a look at the other side, and consider a few applications of the method, and so to examine its usefulness or otherwise to the designer.

Naylor, V.D.

1945 Aircraft Engineering and Aerospace Technology

doi: 10.1108/eb031275

THERE are reasons for believing that in certain states of working, the resultant aerodynamic force on a blade element of an airscrew is normal to a helicoidal surface. The object of the present inquiry was to see to what extent this is borne out by experimental results. It is found that between nothrust and maximum efficiency, the hypothesis is confirmed by experimental results for a certain set of helicoidal airscrews. In the course of the inquiry, a method of evaluating the torque coefficient over the same range, is indicatedthe method giving good accuracy.

Kinkead, A.N.

1945 Aircraft Engineering and Aerospace Technology

doi: 10.1108/eb031276

IN dealing with beams, in which the trace of the plane containing the applied bending moment does not coincide with a principal axis of the beam section, the present design method is to draw the Momcntal Ellipse on the section in question and at the point where the trace of the plane containing the applied bending moment cuts the Momental Ellipse, a tangent is drawn. The linedrawn through the centroid of the section parallel to this tangent is then the neutral axis under the conditions of loading, and the perpendicular distance between these two parallel lines is the radius of gyration of the section for this plane of loading. The fibre stress in the section is maximum at the point in the sectipn furthest away from the neutral axis under the component of the applied bending moment which is perpendicular to the neutral axis.

Weyl, A.R.

1945 Aircraft Engineering and Aerospace Technology

doi: 10.1108/eb031277

IN the tailless aeroplane, sideslip motions during takeoff and landing manoeuvres are specially undesirable, since it tends to be deficient in lateral stability, as we have seen. Hence, arrangements which provide for early compensation of unintentional sideslipping may have some justification.

Kyd, J.A.

1945 Aircraft Engineering and Aerospace Technology

doi: 10.1108/eb031278

INSTRUCTION books, like dentists, are there to be consulted, but people seldom go near either of them until things go wrong and then usually wish that a visit had been paid earlier. Like some dentists some instruction books are pleasant to consult. It is the aim of this article to show how all handbooks can be made interesting and consequently useful.

Bowen, I.G.

1945 Aircraft Engineering and Aerospace Technology

doi: 10.1108/eb031279

DATA are available in References 1 and 2 for the study of the frequency distribution of strength of Alclad sheet to specification D.T.D. 390. Before proceeding with the analysis it is important to ascertain how far this sample is representative of the whole universe of data for the material. The following points are relevant

1945 Aircraft Engineering and Aerospace Technology

doi: 10.1108/eb031280

SOME type of three dimensional drawing has long been recognized as the ideal form of production illustration but they have seldom been used because of the difficulties involved in their preparation. The Glenn L. Martin Company of Baltimore, Maryland, U.S.A., have developed a technique, which includes a machine that cuts 50 to 80 per cent off the time required to prepare a trimctric drawing and four new drawing instruments, that offers promise of considerable simplification.

Clark, A.

1945 Aircraft Engineering and Aerospace Technology

doi: 10.1108/eb031281

UNSATISFACTORY performance of an aircratt engine often leads to the ignition system being suspect without there being positive proof that this is where the trouble lies. A complete change of sparking plugs may have to be undertaken alternatively other ignition components may have to be removed for substitution, bench test or examination. All this work may be necessary to locate the fault, and, in the end, it might even prove not to be in the ignition system at all.