This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 edition. Excerpt: ...we should only have had one of these sets running for the cruising speed, and the coal consumption per i.h.p. per hour would not have been materially greater than for full speed. This is admirably shown by Emmet, in a paper entitled, "Proposed Applications of Electric Ship Propulsion," read before the ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 edition. Excerpt: ...we should only have had one of these sets running for the cruising speed, and the coal consumption per i.h.p. per hour would not have been materially greater than for full speed. This is admirably shown by Emmet, in a paper entitled, "Proposed Applications of Electric Ship Propulsion," read before the American Institute of Electrical Engineers on Feb. 14,1911 (see p. 28 of vol. 30 of Proc. Am. Inst. Elec. Engrs.). Mr. Emmet works out an alternative for the equipment of the U.S. battleship North Dakota. In his alternative, he employs two 12,000-kw. turbo-driven alternators delivering power to four 7000 h.p. induction motors. For speeds ranging from 12 to 15 knots, one generator and two motors are running; from 15 to 21 knots, two generators and four motors are running. Furthermore, the number of poles of the motors are altered at various stages and in such a way as to conduce to economy. Emmet works out a curve for the steam consumption per b.h.p. per hour, and compares it with the steam consumption for the North Dakota, which is a 25,000-h.p. battleship propelled by two Curtis turbines. At 21 knots, the North Dakota's propellers are driven at the high speed of 260 r.p.m., in order to avoid employing for the steam turbines a speed too far below economical limits. Thus the propellers are designed for an uneconomically high speed, and the steam turbines for an uneconomically low-speed. In Mr. Emmet's design, on the contrary, the 21-knot speed corresponds to a propeller speed of only 160 r.p.m. Mr. Emmet's 12,000 kw. turbines run at the high speed of 900 to 1200 r.p.m., even when the ship is travelling at cruising speed, whereas at 12 knots, the North Dakota's turbines run at only 145 r.p.m. Mr. Emmet's design further provides for...
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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Seller's Description:
PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
