Background
BILES, John Harvard was born on January 6, 1854 in Portsmouth.
(This historic book may have numerous typos and missing te...)
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 edition. Excerpt: ...12 per cent. slip ratio and in the four-bladed to 13 per cent. slip ratio. Of course the value of the maximum efficiency will vary very much with pitch ratio, but the position of it in relation to slip will not alter. It may be interesting to notice that as between the threeand four-bladed propellers, while maximum efficiency occurs at about the same slip ratio, i.e. at about the same revolutions in the same diameter propellers, that the corresponding area ratios are '27 and-36, the excess of the latter over the former being simply that due to the extra blade, viz. about one-third. The effect of this extra blade only seems to be to detract from efficiency, as it lowers the maximum possible from 80 per cent. in the three-bladed to 75 per cent, in the four-bladed. It has been shown that the values of S increase with decrease in pitch ratio, i.e. increase of diameter ratio, ranging in four-bladed propellers having narrow blades (of, say, area ratio 17) from-1 at pitch ratio of 1-6 to l-0 at pitch ratio of-4, and in broad blades (say, of area ratio of-65) from Slip per Cent Fig. 95. Model Propeller Experiments. 4 Blades. '125 Width ratio. "E," Curves of efficiency for constant value of "S." 'P," Curves of pitch ratio for constant value of " 3." "1 to 2"0. These are very significant figures, and show the wide range of power absorption of different propellers. The value of S, except for small areas, increases with increase of area ratio for the same pitch ratio, the rate of increase being much greater for small pitch ratios than for large. Taking these two statements together, it is seen that to get a large value of S small pitch ratios and large area ratios are necessary. Having described these curves we...
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BILES, John Harvard was born on January 6, 1854 in Portsmouth.
Studied at Royal School of Naval Architecture and Marine Engineering. Royal Naval College, Greenwich. Doctor of Laws; Doctor of Science.
Professor of Naval Architecture, Glasgow University, since 1891. Has served on various Admiralty and Board of Trade Committees. Is;'Consulting Naval Architect to H. M. India Office and to the Commonwealth Government of Australia.
Master of the Worshipful Company of Shipwrights. Has visited India, Australia, United States of America, Canada, Japan, and China, and nearly nil European countries. Vice-President Institution of Naval Architects; M.lnst.Mech.E., M.Soe. Nav. Arch., United States of America; Honourable Memb. Japanese Society of Naval Architects; Order of Osmanieh, 3rd class. In Constructive Department, Admiralty, afterwards Naval Architect to Clyde Shipbuilding Yard.
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(This book was digitized and reprinted from the collection...)
(This scarce antiquarian book is a facsimile reprint of th...)
(This is an EXACT reproduction of a book published before ...)
(This historic book may have numerous typos and missing te...)
(Excerpt from The Design and Construction of Ships, Vol. 1...)
(This is a reproduction of a book published before 1923. T...)
(This is a reproduction of a book published before 1923. T...)
(This is a reproduction of a book published before 1923. T...)
(This is a reproduction of a book published before 1923. T...)
(This is a reproduction of a book published before 1923. T...)
(This is a reproduction of a book published before 1923. T...)
(Lang:- English, Pages 157. Reprinted in 2015 with the hel...)
(Lang:- English, Pages 219. Reprinted in 2015 with the hel...)
(Lang:- English, Pages 215. Reprinted in 2015 with the hel...)
(Lang:- eng, Pages 513. Reprinted in 2015 with the help of...)
Member of Institution of Civil Engineers. Clubs: National Liberal; University, New, Glasgow; Royal Northern Yacht, etc.