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The Influence of Atmospheric Humidity and Other Factors upon the Static Lift of Airships

Published online by Cambridge University Press:  28 July 2016

Extract

The following Paper comprises some of the results of an investigation originally undertaken by the writer to determine the effects of the humidity of the atmosphere and other secondary factors upon the static lift of airships. It is almost invariably found on completion of such a craft that a considerable deficiency is revealed between the designed lift and the apparent value deduced, for example, from a “ lift and trim ” trial. Clearly, it is of considerable importance that the reason for this discrepancy should, if possible, be determined; for whilst the loss may be only a small percentage of the total displacement of the ship, and hence difficult to trace, yet considered in terms of disposable lift, it frequently is very serious.

Type
Research Article
Copyright
Copyright © Royal Aeronautical Society 1931

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References

2 Kaye, and Laby's, Physical and Chemical Constants,” p. 42 Google Scholar.

3 See for example, Mellor's, Higher Mathematics for Students of Physics and Chemistry,” p. 358 Google Scholar.

4 For a discussion on the effects of water-vapour on the pressure and temperature, etc., of the atmosphere, see also W. J. Humphreys’ “ Physics of the Air,” Chap. V,

5 Cf. Stewart's, Aircraft Instruments,” p. 15 Google Scholar.

6 e.g., Glaisher's “ Hygrometrical Tables “ or Kaye, and Laby's, Physical and Chemical Constants,” p. 42 Google Scholar.

7 Cf. “ Handbook of Lambrecht Polymeter,” pp. 4-5.

8 Cf. Kaye, and Laby's, Physical and Chemical Constants,” p. 23 Google Scholar.

9 Cf. Scott and Richmond, “ The Effect of Meteorological Conditions on Airships,” Appendix (III.). Journal R.Ae.S., March, 1924.

10 See C. J. Stewart's “ Aircraft Instruments,” Chap. I.

11 Cf. Blakemore and Pagon's “ Pressure Airships.”

12 “ The Effect of Meteorological Conditions on Airships,” Journal of R.Ae.S., March, 1924.

13 See the paper, already referred to, by Scott and Richmond. Appendix III.

14 Cf. “ The Effect of Meteorological Conditions on Airships,” para. 1 (a).

15 e.g., Crocco's solution given in Blakemore and Pagon's “ Pressure Airships.”

16 Humphreys, W. J., “ Physics of the Air,” p. 72 Google Scholar.

17 Vide A.R.C Report 81.

18 Vide Paper on “ The Metalclad Airship ” read by C. B. Fritsche before the R.Ae.S. on May 14th, 1931.

19 For a more rigid proof see W. J. Humphreys' “ Physips of the Air,” Chaps. II. and XIII.

20 Deutsch. Met. Zeit., Vol. III., 1884, p. 421 Google Scholar.

21 Abh. d. K.P. Met. Inst., Vol. III , No. 6, Berlin, 1900 Google Scholar.

22 Cf. The Report of the Court of Inquiry on the disaster to the U.S. airship “ Shenandoah.”

23 Vide the Paper on “ The Metalclad .Airship’ and subsequent discussion.

24 See, for example, Poynting and Thomson's “ Properties of Matter,” Chap. XIV.

25 Cf. “ Report of the R.101 Inquiry,” Appendix 5.

26 See also a reference in the paper already quoted by Scott and Richmond.

27 e.g., Shakespear, R. & M. Nos. 316, 516, 517. Shakespear and Daynes, ibid, 1917 No. 367; 1918 No. 435; also Daynes, Roy. Soc. Proc. A., 1920, xcvii, 273.

28 A. B. Wood's “ Sound,” Section III.

29 Cf. Wood's, A. B.Sound,” p 413 Google Scholar, or The Mechanical Properties of Fluids ” (Blackie & Sons, Ltd.), p. 295 Google Scholar.