Preliminary Design of Boats and Ships
A veteran designer's approach to conceptual vessel design for the layman and the beginning professional
by Cyrus Hamlin, N.A.

185x 255mm

Published by Cornell Maritime Press
A Division of Schiffer Publishing, Atglen, PA, USA


ISBN 978-0-87033-621-8

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Extract from back cover of book:

Intended for people who are not boat designers, this book describes how to bring a boat of your dreams into being. Written by an experienced naval architect, it prepares intelligent amateurs to create conceptual vessel designs ready for a naval architect's finishing touches. Included are all the basic rationales and data needed to undertake a designing project, presented in a style that successfully bridges the gap between the technical approach of naval architecture books and the over-simplification of consumer magazine articles. The book provides all the essential information, including a discussion of vessel stability and trim. Mathematical applications are demystified as much as possible. Although most naval architecture books deal with only one type of vessel, this volume covers a wide variety of watercraft. It can be equally useful if your envisioning a modest cruising yacht or a sixty-foot fishing boat.

"An eminently useful book, rich with information about the many factors that contribute the development of a successful design how the design process works, how to use it yourself, and how (and why) designers use it"
John R. Ordway, Principal, John Ordway & Associates

"A most informative and delightfully written treatise on the basic principles of naval architecture, and on an aspect of the design process which has been addressed all too infrequently."
Richards T. Miller, Captain USN (Ret)

"A fascinating, well-written introduction to preliminary design, with particular emphasis on yachts and small commercial craft. It contains much useful data, all tied together with illustrative narration and entertaining, yet valuable, philosophical commentary."
Professor Harry Benford, NAAME, University of Michigan

About the Author - Cyrus Hamlin, whose designing credits, over some forty years, run the gamut from small cruising sailboats and powerboats to a seventy-five-foot Hudson River sloop replica, has lived and worked in Maine for most of his life. He recalls: "I decided upon a naval architect's career at the age of nine, when a chum observed that whoever designed the expensive yachts in the harbor must make a lot of money. I have spent the rest of my life trying to prove that statement."

Illustrations: Black & White

Units of Measurement: Imperial and Metric




- Naval architecture: part art, part science; the role of the naval architect; air/water interface; the design spiral

Tools of the Trade
- The sketch designer's tool kit: drawing paper, pencils and pcns, measuring devices, triangles, and straight edges; methods of reproduction; sources of information

- Sketching explained; freehand drawing; hints on successful sketching; laying out a sketch; your first sketch

Vessel Geometry
- Showing the hull shape: models, drawings; lines drawing: profile, plan, sections, buttocks, waterlines, diagonals; DWL (design waterline); displacement; form coefficients; making a pickle model

- High school level math helpful; exponents and space; reference axes: X, Y, Z; relativity and similitude; measurement of areas and centers; moments; use of graphs; curves of form

The Forces of Nature
- Characteristics of fluids; buoyancy; viscosity; flow of a fluid (air or water) over a body; laminar and turbulent flow; waves; acceleration

Vessels in Nature
- Archimedes' principle; displacement; trim; natural rolling period; metacentric height, GM; turning and course keeping; stability; six types of vessel motion; moments of inertia; speed-length ratio, SLR; bulbous bow

People Afloat
- Watercraft a universe; the effect of motion on human activities and well-being; safety; comfort afloat; control of shipboard environment; human dimensions

The Design Process
- Design starts in someone's head; design spiral; steps from concept to architect; you and the naval architect; plan format; schematics; model testing

A Vessel's Function
- "Plan for reality, not dreams"; defining the role of the vessel; safety

Esthetics and Delight
- Importance of appearance; form follows function; assuring it looks right when built; checking appearance with a model

- Comparison of building materials: wood, steel, aluminum, FRP, ferro-cement; building methods described; suitability of material versus vessel size and function

- Vessel resistance, frictional and residual; oar power; sail power; mechanical power; gasoline versus diesel; transmission and propulsion devices; power definitions; machinery installation; estimating power required; propeller sizing

- Estimating vessel building and operating costs; new construction; used boats; profit

Power Yachts
- Types: displacement, semidisplacement, planing; suggestions for hull form; arrangements; catamarans

Sailing Craft
- Romance of sail; stability; balance; monohull versus multihull; light displacement; types of sailing craft; estimating displacement and sail area; rudders; working sailing craft: passenger, school ships, freighters, research; historic sailing craft; sail assist

Commercial Craft
- Must make money; function versus cost; weatherliness; safety of crew and vessel; types of commercial craft; carrying passengers; designing commercial craft

Institutional Craft
- Types of institutional craft; specialized functions; cost; the institutional perspective

- Complete specifications essential; use of catalogs and manufacturers for information; use of schematic sketches; checklist of contents

A Visit to the Naval Architect
- Owner/naval architect/builder relationship; diagram of complete designing and building process; design fees; getting bids; construction; trials. It's all yours!

I Addresses
- Professional societies; national and international agencies; periodicals
II. Useful Data
- Weights of materials; English and metric units of measurement and conversions
III. Symbols
- Definitions of symbols used in this book

Planning for Profitability
- "Careful planning maximizes your chances for profitability," reprinted from National Fisherman

- Definition of terms
- Listing of useful literature, arranged by category