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Article
Publication date: 1 July 1958

FROM time to time controversies arise as to the respective merits of two, or possibly more, solutions of a certain technical problem. These rage fiercely for a few years and then…

Abstract

FROM time to time controversies arise as to the respective merits of two, or possibly more, solutions of a certain technical problem. These rage fiercely for a few years and then, usually, one system proves to be demonstrably better, and becomes almost universal. Thus the axial flow compressor is now universal for all but the smallest gas turbine aero‐engines. There is still an active discussion as to whether low‐voltage d.c. will be entirely superseded by 400 cycle a.c. At a recent conference on aircraft icing protection, mentioned in this issue, the relative merits of hot gas and electrical deicing were argued, as was the degree of automatic control which was desirable in a deicing system. In the field of aircraft auxiliary services the lead has for a long time been held by hydraulics, with electrical actuation challenging and pneumatics rather neglected, except for certain specialized applications. In an article in this issue Mr J. Wotton, of Hunting Aircraft, gives the findings of a project study on the possibilities of pneumatics, undertaken with the small twin jet airliner design known as the P 107 in mind.

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Aircraft Engineering and Aerospace Technology, vol. 30 no. 7
Type: Research Article
ISSN: 0002-2667

Article
Publication date: 1 December 1958

To the Editor, DEAR SIR, So my friend, Mr Wotton, has written an article (in your July issue) putting the case for pneumatics! A very good one too. Plenty of new ideas to add fuel…

Abstract

To the Editor, DEAR SIR, So my friend, Mr Wotton, has written an article (in your July issue) putting the case for pneumatics! A very good one too. Plenty of new ideas to add fuel to the Pneumatics v. Hydraulics debate. Plenty of meat for designers to get their teeth into—maybe some fish as well—red herrings?

Details

Aircraft Engineering and Aerospace Technology, vol. 30 no. 12
Type: Research Article
ISSN: 0002-2667

Article
Publication date: 1 July 1958

J. Wotton

THE outstanding difference in using a gas as compared with a liquid as a means of transmitting power is the high degree of compressibility which can be achieved in the one and its…

39

Abstract

THE outstanding difference in using a gas as compared with a liquid as a means of transmitting power is the high degree of compressibility which can be achieved in the one and its virtual absence in the other. As might be expected there are instances in both cases where the peculiar characteristic is of value and others in which it is a drawback. In some cases a soft damping action is required for which compressed air provides a suitable medium, while in others a high degree of damping at a controlled rate can best be performed by the use of hydraulic fluid. In applications where complete irreversibility is required by means of the locking of the medium in some restricted space air is virtually useless and in such cases recourse has to be made to some form of damping, either hydraulic or mechanical, which generally adds considerably to the complexity when compared with a straight hydraulic system. Also, in systems which call for small dead beat movements the consumption of compressed air is often unacceptable. On the other hand the medium itself does not constitute a fire risk, is readily replaced in flight in the case of small leakages and is responsible for quite a small expenditure in terms of engine power.

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Aircraft Engineering and Aerospace Technology, vol. 30 no. 7
Type: Research Article
ISSN: 0002-2667

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Article
Publication date: 1 December 1998

45

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Industrial Lubrication and Tribology, vol. 50 no. 6
Type: Research Article
ISSN: 0036-8792

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Assembly Automation, vol. 25 no. 3
Type: Research Article
ISSN: 0144-5154

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Article
Publication date: 1 March 2004

74

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Assembly Automation, vol. 24 no. 1
Type: Research Article
ISSN: 0144-5154

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Article
Publication date: 1 December 1999

79

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Assembly Automation, vol. 19 no. 4
Type: Research Article
ISSN: 0144-5154

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Article
Publication date: 1 April 2001

62

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Industrial Robot: An International Journal, vol. 28 no. 2
Type: Research Article
ISSN: 0143-991X

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132

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Assembly Automation, vol. 25 no. 2
Type: Research Article
ISSN: 0144-5154

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Article
Publication date: 1 September 1951

H.R. Haerle

THE development of aircraft penumatic equipment has progressed so satisfactorily in recent years that actuation of vital services by means of compressed air is becoming…

Abstract

THE development of aircraft penumatic equipment has progressed so satisfactorily in recent years that actuation of vital services by means of compressed air is becoming increasingly popular. In this brief review of developments to date an attempt will be made to show how the air which has been made available as a result of compressor improvements is utilized and by way of introduction it may be of interest to recall some of the bold experiments which were made in earlier years.

Details

Aircraft Engineering and Aerospace Technology, vol. 23 no. 9
Type: Research Article
ISSN: 0002-2667

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