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Article
Publication date: 1 May 1947

C.F. Toms

THIS paper presents a summary of the method and results of a general investigation into the performance characteristics of ‘single’ autogyro and helicopter rotors, which was a…

62

Abstract

THIS paper presents a summary of the method and results of a general investigation into the performance characteristics of ‘single’ autogyro and helicopter rotors, which was a preliminary to the establishment, by the firm the author serves, of a helicopter division.

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Aircraft Engineering and Aerospace Technology, vol. 19 no. 5
Type: Research Article
ISSN: 0002-2667

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Article
Publication date: 1 April 1957

Karl L. Sanders

IN the present paper an attempt has been made to determine the optimum aspect ratio, wing loading and fuel load ratio under certain specified design conditions. Aeroplanes with…

119

Abstract

IN the present paper an attempt has been made to determine the optimum aspect ratio, wing loading and fuel load ratio under certain specified design conditions. Aeroplanes with turbojet as well as with airscrew propulsion have been considered.

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Aircraft Engineering and Aerospace Technology, vol. 29 no. 4
Type: Research Article
ISSN: 0002-2667

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Article
Publication date: 1 June 2002

Zdobysław Goraj, Alfred Baron and Jan Kacprzyk

This paper focuses mainly on the experimental and in‐flight spin investigations for an executive light airplane, named I‐23 and built in the Institute of Aviation (Warsaw…

1233

Abstract

This paper focuses mainly on the experimental and in‐flight spin investigations for an executive light airplane, named I‐23 and built in the Institute of Aviation (Warsaw, Poland). It is a single‐engine, all composite, straight wing, retractable undercarriage, conventional configuration and flight control system airplane. In‐flight spin tests confirmed good rudder and elevator effectiveness for spin recovery in a wide range of positions of the center of gravity. A typical time history of a spin entry and the developed spin and recovery is shown as well.

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Aircraft Engineering and Aerospace Technology, vol. 74 no. 3
Type: Research Article
ISSN: 0002-2667

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Article
Publication date: 1 July 1947

Roy A. Liming

THE problem involved in obtaining satisfactory surface contours for assemblies such as are required in modern aircraft development demands for its successful solution the…

108

Abstract

THE problem involved in obtaining satisfactory surface contours for assemblies such as are required in modern aircraft development demands for its successful solution the co‐ordinated, concentrated efforts of all those concerned with both the design and manufacturing processes. Even the casual observer can see that, if optimum performance is to be realized, the external skin or covering, whether made of thin sheet stock or precision machined from heavier plate stock, must be continuously smooth.

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Aircraft Engineering and Aerospace Technology, vol. 19 no. 7
Type: Research Article
ISSN: 0002-2667

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Article
Publication date: 1 April 1950

The Thirteenth Wright Brothers Lecture delivered by Mr A. E. Russell of The Bristol Aeroplane Co. Ltd. before the Institute of the Aeronautical Sciences in New York on December…

59

Abstract

The Thirteenth Wright Brothers Lecture delivered by Mr A. E. Russell of The Bristol Aeroplane Co. Ltd. before the Institute of the Aeronautical Sciences in New York on December 17, 1949. The problem of flutter is one of the earliest associated with flying but has, until comparatively recent times, been solved merely by solving the problem of strength coupled with the tactical distribution of lead weights. We are now becoming quite proficient at solving the problem of strength and are disturbed if our test structures do not fall within 1 or 2 per cent of the design loads (however arbitrary these loads may be). At the same time this steady refinement of design has resulted in a reduction of structure weight for given design loads. Refinement of structural design has reduced the stiffness of the structure and this, coupled with a steady increase of cruising speeds, has brought the flutter problem into its present prominence.

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Aircraft Engineering and Aerospace Technology, vol. 22 no. 4
Type: Research Article
ISSN: 0002-2667

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Article
Publication date: 1 October 1947

W.J. FRS. DUNCAN D.Sc

When one is presented with a book having such a very broad title as ‘Introduction to Aeronautics’ one does not know exactly what to expect. But one looks for a broad treatment of…

16

Abstract

When one is presented with a book having such a very broad title as ‘Introduction to Aeronautics’ one does not know exactly what to expect. But one looks for a broad treatment of the subject and not merely a treatise on one particular aspect. What one does find in this instance is an introductory treatise on some non‐structural aspects of the design of aeroplanes and rotating wing aircraft, together with some sketches of more fundamental matters. The precise contents can be judged from the titles of the eight chapters, which are: Basic Concepts; The Power Unit; Drag and Performance Estimation; Flaps, Take‐Off and Landing; Control and Stability; Wind‐Tunnel and Flight Testing; Flight Manoeuvres; Load and Pressure Distribution; Rotating Wing Aircraft. There is an appendix corresponding to each chapter. In his ‘Explanatory Note’ the author states ‘In the chapters the matters dealt with are treated only to the extent required for a practical application, the proofs of formulae being usually omitted. In the appendices selected matters are further expounded, and additional information and references to published Reports are given.’ And in the Preface he says, ‘I trust… that the contents and the method of presentation will be found acceptable by the aircraft technician and draughtsman, and by the student of aeronautics also’. These sentences explain very adequately the intention of the author and the scope of the book, while indicating its severe limitations.

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Aircraft Engineering and Aerospace Technology, vol. 19 no. 10
Type: Research Article
ISSN: 0002-2667

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Article
Publication date: 1 July 1947

The characteristic trend of modern technical and scientific development is expressed by the fact that, in most important inventions and discoveries the first experiments are…

18

Abstract

The characteristic trend of modern technical and scientific development is expressed by the fact that, in most important inventions and discoveries the first experiments are preceded by a large amount of pure theoretical work, including generally a lot of mathematical speculations at a very high level; less opportunity being left to the mere ingenuity of the skilled technician, which was sufficient not so long ago to make very important discoveries and inventions by purely experimental methods with only a minimum of theoretical knowledge. The most conspicuous example of that kind of scientific discovery is, of course, the release of atomic energy, which was preceded by an enormous amount of theoretical work in mathematical physics. This assertion can be applied on a more modest scale to the recent development of the liquid fuel propelled rocket. Though the powder propelled rockets have a long story, which goes far back into history, we may consider the liquid fuel rocket as a new invention. It had been preceded by a quite considerable literature, and before the first successful bifuel rocket took the air, the theoretical aspect of the problem had been fairly well developed.

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Aircraft Engineering and Aerospace Technology, vol. 19 no. 7
Type: Research Article
ISSN: 0002-2667

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Article
Publication date: 31 January 2011

Sandy Toogood, Steven Boyd, Andy Bell and Helen Salisbury

In 1997 Tom was a 32‐year‐old man with a diagnosis of severe intellectual disability and autism who engaged in high‐rate challenging behaviour. Tom's out‐of‐area placement was…

750

Abstract

In 1997 Tom was a 32‐year‐old man with a diagnosis of severe intellectual disability and autism who engaged in high‐rate challenging behaviour. Tom's out‐of‐area placement was about to break down and he needed help urgently. For 16 months specialist challenging behaviour services supported Tom directly in a single‐occupancy service. They conducted functional assessment and delivered multi‐level intervention, including medication withdrawal, environmental enrichment, skills teaching, augmented communication and targeted behavioural intervention. Support was then transferred to mainstream learning disability services. Following intervention, the rate of challenging behaviour shown by Tom fell significantly from more than 200 instances per day to almost none. Community involvement and engagement increased. Tom moved into shared accommodation with support from mainstream learning disability services at no additional cost. Improvement at intervention was still apparent 10 years later. Tom's story adds to a growing number of articles showing how focused intervention can deliver lasting improvement in quality of life. Four aspects of Tom's story are discussed in the light of the Mansell Report.

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Article
Publication date: 26 August 2024

Alesia Gerassimenko, Lieven De Moor and Laurens Defau

Literature has already analysed the relation between a property’s time on market (TOM) and other housing characteristics, but few to none include the property’s energy performance…

20

Abstract

Purpose

Literature has already analysed the relation between a property’s time on market (TOM) and other housing characteristics, but few to none include the property’s energy performance certificates (EPC) and none make a comparison between the selling and rental market. This paper aims to address these gaps by studying the relationship between TOM, price and EPC in both markets.

Design/methodology/approach

By introducing a combination of alternative tests, this study confirms a causal relation between TOM and price in the cross-sectional data. This allows this study to use a two-stage least square model and analyse 392,498 Flemish sale and rental properties transacted between 2019 and 2023.

Findings

The results indicate that both sale and rental properties with higher prices increase the TOM by 4–6 days, and this effect is even stronger in the selling market when the value-added tax is included. This study also finds that EPC labels have a complex relation with the time on market. A-labelled properties tend to increase the transaction time between 10 and 54 days, but B- and C-labelled properties decrease TOM between 20 and 30 days. In addition, the poorer performing labels (E and F) react differently across markets because of market-specific policies.

Originality/value

This paper provides novel insights by studying the relationship between TOM and EPC while also considering TOM’s endogenous relationship with the price. We control for these relationships in both the selling and rental market.

Details

International Journal of Housing Markets and Analysis, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1753-8270

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Article
Publication date: 1 June 1999

George K. Chacko

Gives an in depth view of the strategies pursued by the world’s leading chief executive officers in an attempt to provide guidance to new chief executives of today. Considers the…

10002

Abstract

Gives an in depth view of the strategies pursued by the world’s leading chief executive officers in an attempt to provide guidance to new chief executives of today. Considers the marketing strategies employed, together with the organizational structures used and looks at the universal concepts that can be applied to any product. Uses anecdotal evidence to formulate a number of theories which can be used to compare your company with the best in the world. Presents initial survival strategies and then looks at ways companies can broaden their boundaries through manipulation and choice. Covers a huge variety of case studies and examples together with a substantial question and answer section.

Details

Asia Pacific Journal of Marketing and Logistics, vol. 11 no. 2/3
Type: Research Article
ISSN: 1355-5855

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