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The Screw Propeller in Air

Published online by Cambridge University Press:  24 August 2017

M.A.S. Riach
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Extract

At the present time there does not appear to be any really adequate theory of the airscrew. The only theory that has been developed recently is the one given by Mr. F. W. Lanchester in a paper to the Institution of Automobile Engineers in April, 1915.

Information

Type
Research Article
Information
The Aeronautical Journal , Volume 21 , Issue 82 , June 1917 , pp. 123 - 141
Copyright
Copyright © Royal Aeronautical Society 1917

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References

Note on page 123 * " The Screw Propeller," by F. W. Lanchester. April 1915, I.A.E.

Note on page 123 ✝ " Airscrews," by M. A. S. Riach. (London : Crosby, Lockwood and Son).

Note on page 124 * Trans. I.N.A., Vol. XXX. Vol. LIII.✝ I.N.A., Vol. LII.

Note on page 128 * Trans. I.N.A., Vol. XXX.

Note on page 129 * " A Contribution to the Theory of Propulsion and the Screw Propeller," by F W Lanchester. Trans. I.N.A., 1915

Note on page 130 * "Nouvelles Recherches sur la Résistance de l'Air et l'Aviation," 1914

Note on page 132 * Trans. I.N.A., Vol. LIII.

Note on page 139 * Unless the blades are very wide, when the ratio becomes larger. It is reaHy unsafe to generalise on this point, as it is quite conceivable that the correction factors commonly employed in the old theory are liable to variation–in which case the end effects on blades might be sufficiently small to be neglected entirely. Without wind-channel results it is extremely difficult to determine whether such fine points as these require modification or not. I think, however, that it may be taken for granted that narrow bladed airscrews require smaller cftrrection factors than those with wide blades, quite apart from any possible end effects which may alter the character of the purely two-dimensional form of flow considered in the theory developed in the Paper.