- Hardcover: 371 pages
- Publisher: Intl Marine Pub; First Edition edition (January 1, 1987)
- Language: English
- ISBN-10: 0877422273
- ISBN-13: 978-0877422273
- Package Dimensions: 10.5 x 7.7 x 1.4 inches
- Shipping Weight: 3 pounds (View shipping rates and policies)
- Average Customer Review: 10 customer reviews
- Amazon Best Sellers Rank: #1,652,323 in Books (See Top 100 in Books)
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Seaworthiness: The Forgotten Factor Hardcover – January 1, 1987
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His book came of age, however it has not lost its message and is as valid today as it was when written.
Every serious sailor should read it!
Perhaps the most contentious part of the book is the discussion of keel aspect ratio since long dagger like keels are seen on the highest performance (in fair weather) boats. I think he could have been even more clear at discussing the role of bound vortices in allowing high angles of attack on low aspect ratio foils by showing the wing of the Concorde. In addition the book shows it's age with little reference to Computational Fluid Dyanamics (CFD) which lends itself in it's latest versions to the analysis of quasi-random inputs typical of the confused and steep seas of a building storm. Also, I think Marchaj could have emphasized a bit more the difficulty of scaling model testing to real world behavior by a review of the laws of dynamic similitude and the matching of the significant dimensionless ratios such as Reynolds number and others with the geometric scale ratios.
In the late 1980s the combination of static stability analysis and model testing used in this discussion represented all that could be reasonably used to communicate to an interested audience. Now, the use of CFD tools can, if and only if carefully validated to model tests and real world behavior, much more clearly show the type of behavior differences that Marchaj describes.
In the absence of such a by no means inconsiderable effort, there is really a lot to learn about boats and the sea in this volume and it is rather a treat to read. It just may not be the last word on the subject.
Tony Marchaj, an avid sailor and independent aerodynamics consultant, theorizes that the "increased casualities amongst contemporary yachts" is due to modern sailing yacht design, which, he feels, often sacrifices safety speed.
In this book, the author attempts to objectively consider "the design features" which contribute to a sailing yacht truly being seaworthy.
Though the equations are kept to a minimum, they are still there, and--to my poor mind, at least--they are forminable. But Marchaj does a fine job of not only helping you to intuitively grasp the nature of whatever he's speaking about, he uses numerous of graphs.
Also, he offers lots of literary quotes and allusions. This certainly helps those of us who have a more literary bent, but who also revel in the beauty of boats and the sea.
Some of the book's chapters include "Seaworthiness and Safety at Sea," "The Effect of Rating Rules on Yacht Design," "Rolling Induced by Waves," and the very helpful "Survival Tactics" (which includes a section on "Strategy of Sailing in Storm Conditions").