Showing papers by "Rolls-Royce Limited published in 1966"

The effect of fibre orientation on the tensile strength of fibre-reinforced metals

Abstract: The ultimate tensile strength of fibre-reinforced metal composites has been investigated as a function of fibre orientation, using composites of aluminium reinforced with stainless steel wires and with silica fibres. For unidirectionally-aligned fibres the strength and the mode of composite fracture can be correlated quantitatively with the fibre orientation. In specimens containing fibres at more than one orientation, interaction between fibres inhibits an exact quantitative interpretation, although qualitatively the composite strength and fracture behaviour can be explained in terms of the same general principles which govern the behaviour of unidirectionally-aligned fibre composites.

The strengths of flame-polished sapphire crystals

Abstract: Single crystals of sapphire, 1 mm in diameter and having bending strengths up to 700 Kg/mm2, have been prepared by flame polishing and a technique for locating fracture origins in high strength specimens has been developed. The mechanism of flame polishing, and the relation between flame conditions and crystal strengths, have been studied. Correct flame polishing strengthens crystals by removing abrasive surface damage, microscopic defects within the crystals then frequently limit the strength.

Lift Jet Installational Experience

Abstract: A review of some of the progress made in lift jet installations is presented in this paper. At the heart of it all is the low cost lightweight RB162 second generation lift jet which is simple and makes extensive use of glass reinforced plastics. Examples of plastic components are shown. The higher thrust/weight and thrust/volume ratio of a third generation lift jet are revealed. The weight of installed features is of comparable importance to the weight of the basic engine. Installed weight has been reduced over three lift jet generations, more than keeping pace with the improvements in basic engine thrust/weight ratio. Weight breakdowns are given for the V.T.O.L. equipment in a fighter‐type aircraft representative of all three generations. Progress on lift intake and exhaust jet deflectors is shown with reference to specific examples. Ground erosion is briefly discussed and shown to be greatly reduced by multiple nozzles and the rolling take‐off technique. Progress being made on some of the problems associated with installing eight lift jets in a V.T.O.L. strike aircraft is briefly discussed with reference to maintenance and instrumentation.

The Economics of Aircraft Noise Suppression

Abstract: DISCUSSIONS on aircraft noise problems unfortunately result too often in inconclusive statements of good intentions on the one hand from those who are connected with making the noise, or emotional recrimination on the other from those who have to suffer it. Administrators and even eminent aircraft designers protest ignorance of acoustic technology, while sufferers from noise show a marked reluctance to face the most elementary economic facts. Perhaps one of the reasons why many people are still suspicious of technology in this country is that we have not yet mastered the art of presenting all the factors, and particularly the economic factors, in a technological problem in such a way as to make it possible to see clearly the issues involved. This paper is an attempt to give a better understanding of the interactions between the technical, economic and political sides of the aircraft noise problem. It is meant to show how these interactions might be studied, rather than to give definite answers to specific problems.