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The Cross-Section of the Semi-Rigid Airship

Published online by Cambridge University Press:  28 July 2016

F. G. Evans
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Extract

The scope of the paper is not so wide as the title may suggest. The primary object is to put forward a graphical method of determining the shape of the cross-section of the airship, and the loads in the envelope and rigging wires, in the plane of the cross-section, for different loading conditions.

Various secondary matters, such as a brief review of other methods of dealing with the subject, and the effect of different schemes of rigging on “ breathing,” are included in the paper as points of interest.

Type
Research Article
Information
The Aeronautical Journal , Volume 34 , Issue 236 , August 1930 , pp. 690 - 722
Copyright
Copyright © Royal Aeronautical Society 1930

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References

Note on Page 690 * “Breathing”—change of shape due to change of loading.

Note on Page 690 1 These reference figures, 1, 2, 3, etc., correspond to the numbering of the assumptions discussed in Part II.

Note on Page 691 ‡ “Internal loads” refers to the tensions in fabric and rigging, and not to the internal pressure, which is regarded as an “applied load.”

Note on Page 691 * “Super-pressure” is the internal pressure extra to that arising from the “lift” of the gas. It is usually obtained by inflating ballonets within the envelope with air from a blower or scoop. Its objects are:—To maintain the shape; render the cross-section more nearly circular, thus making the hull a better streamline shape; and to make the envelope, as a whole, a stronger structure.

2 See reference 1.

Note on Page 691 1 See reference 1.

3 See reference 1.

4 See reference 1.

Note on Page 695 * See reference 1.

5 See reference 1.

6 See reference 1.

Note on Page 696 6 See reference 1.

7 See reference 1.

Note on Page 698 5 See reference 1.

Note on Page 701 * Except in so far as the longitudinal tension affects the lateral stretch of the fabric.

Note on Page 702 * See “Pressure Airships,” by Blakemore and Pagon (Ronald Press Co., N. Y. ).

Note on Page 702 † A reservation mu,st be made in the case of turning flight, when bending in the horizontal plane is set up, as the keel is situated at the neutral plane and is narrow compared with the width of the envelope, of which at least the upper half is subjected to considerable internal pressure. Under these conditions it appears probable that the envelope will contribute most of the strength in this direction.

Note on Page 703 * See previous footnote.

Note on Page 705 * This method is given in a paper by Haas and Dietzius on the Stretching of the Fabric, and the Deformation of the Envelope in Non-rigid Balloons, dated Berlin, December, 1912, A translation from the German by Karl K. Darrow is available as N.A.C.A. Report No. 16 (1917).

Note on Page 705 † Rendiconti Esperienze e studi dello Stabilimento Costruzione Aeronautiche, Vol. III. (1914).

Note on Page 705 ‡ “Pressure Airships,” by Blakemore and Pagon (The Ronald Press Co., N. Y.). This book also contains an explanation of Crocco's theory.

Note on Page 712 * See Supplement at end of this paper.

Note on Page 712 † See Assumption (I).

Note on Page 713 * “Correct”=as calculated from given data.

Note on Page 713 † “As drawn” or “actual” = as measured from the actual diagram.