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Binding: Hardcover
Dewey Decimal Number: 797
EAN: 9780070402508
ISBN: 0070402507
Label: International Marine Publishing
Manufacturer: International Marine Publishing
Number Of Items: 1
Number Of Pages: 401
Publication Date: June 01, 1996
Publisher: International Marine Publishing
Studio: International Marine Publishing
Browse for similar items by category: Click to Display
Editorial Review:
Book Description:
This volume replaces Marchaj's classic Sailing Theory and Pactice, published 25 years ago, and offers new information on, rig design, sail construction and trim, wind-sail interaction, and the structure of the wind. The performance of any sailing craft depends largely on the power of the available sail--how the rig uses the wind and turns it into a useful driving force. But sail forces are determined by a multitude of factors, including wind speed, sail area and shape, and steadiness of the wind, among others. From wind-tunnel tests that he has conducted, Marchaj describes how these factors affect sail power and why certain rigs are superior in power and efficiency--concluding that the Bermuda, or marconi, rig is by no means the best available. This major work is an accessible, nonmathematical treatment of the subject and marks a turning point in modern thinking in the arena.
Average Rating: 
Rating: -
I found this book a great help in sorting out the relative importance of sail fullness, trim angle, mainsheet tension, luff tension and vang tension. The result for me is faster sailing and better finishing positions.
Winning a sailboat race starts with proper sail trim. Marchaj describes in great detail sail aerodynamic throry with illustrative wind tunnel measurements and clear diagrams that allow me to understand the basic concepts. This understanding allows me to focus on the important aspects of sail trim during a race so I can continuously maximize my boat speed.
He explains how to use wool streamers to show what the flow is on the lee side of the sail. The use of wool streamers allows me to rapidly trim the sail to an optimum point.
Rating: -
This is the first book of Marchaj's I have read, at the advice of the Amateur Yacht Research Society. It is an excellent survey of the physics of sail power, focusing primarily on sail issues. It is a fascinating read for any sailor who cares about the performance of their vessel or is curious about an explanation of sail physics beyond the five-minute airfoil explanation.
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