Principles of Yacht Design / Edition 3

Principles of Yacht Design / Edition 3

by Lars Larsson, Rolf Eliasson
3.5 2
Pub. Date:
McGraw-Hill Professional Publishing
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Principles of Yacht Design / Edition 3

Principles of Yacht Design is both comprehensible to amateurs and comprehensive for professionals. It follows the design of a 40-foot cruising sailboat from the first sketch to the final weight,strength,and sail area calculations,with tables,charts,and diagrams to let the reader adapt the process to any design. This edition is revised and expanded to cover powerboats as well as sailboats.

Product Details

ISBN-13: 9780071487696
Publisher: McGraw-Hill Professional Publishing
Publication date: 07/08/2007
Edition description: Revised
Pages: 368
Product dimensions: 8.00(w) x 10.80(h) x 1.05(d)

Table of Contents

Preface to the Second Edition

List of Symbols


1. Design Methodology

The design spiral

Computer aided design (CAD)

2. Preliminary Considerations

Choice of boat-type

Intended use

Main dimensions


Checklist of considerations

Checklist for the YD - 40

3. Hull Geometry


Lines drawing


Work plan

Computer aided design of hulls

4. Hydrostatics and Stability

Calculation of areas

Wetted surface


Centre of buoyancy

Water plane area

Transverse and longitudinal stability at small angles

Transverse stability at large angles of heel

Curve of static stability


Influence of waves on the righting moment

Stability statistics

Assessment of seaworthiness

5. Hull Design

Forces and moments on a sailing yacht

Resistance components

Viscous resistance, basic concepts

Frictional resistance

Viscous pressure resistance


Wave resistance, basic concepts

Influence of hull shape on wave resistance

Heel resistance

Added resistance in waves

Other seakeeping aspects

Hull statistics

6. Keel and Rudder Design

Flow around a wing

Definition of the keel planform

Classical wing theory

Tip shape

Advanced planform design

Evaluation of some planform concepts

Definition of the section

Three useful NACA sections

Influence of shape on sectioncharacteristics

Some practical conclusions regarding section shape

Influence of deviations from the theoretical section shape

Advanced section design

Statistics on keel and rudder area

The YD - 40

7. Sail and Rig Design

Flow around sails


Sail camber

Mast interference

Means for reducing mast distubances


A practical model for sail and rig aerodynamics

Sail statistics

8. Balance

Effect of heel

Good balance

Centre of effort of the underwater body

Centre of effort of the sails


Rudder balance

9. Propeller and Engine

Resistance in calm and rough weather

Propeller characteristics

Design of an optimum propeller

Performance of the non-optimum propeller

Check of blade area

Propeller resistance

10. High Speed Hydrodynamics



Forces on a planing hull

Spray rails, stepped bottoms and transom flaps

Dynamic stability

Alternative propulsion devices

An example

11. Rig Construction

Definitions and scope of the standard

Forces on the shrouds

Forces on the stays

Comparison between wire and rod

Transverse mast stiffness

Longitudinal mast stiffness

Fractional mast top



The YD - 40 rig

12. Hull Construction

Concepts in structural mechanics

Global loads

Local hydrostatic loads

Local hydrodynamic loads

Transverse load distribution

Local deformations

Forces from the keel

Forces from grounding

Forces from the rudder

Summary of loadings

13. Materials

Glass reinforcement

Wet laminates


Exotic laminates


Typical sandwich buckling

Sandwich bending

Sandwich in practice

Final remarks

14. Scantling Determination

Structure of the ISO Standard

Hull definitions

Basic laminate

Design loads for the bottom

Design loads for the topsides

Design loads for the decks and bulkheads

Design loads for the internals

Longitudinal impact distribution factor

Area reduction factor

Panel calculation

Stiffener calculation

Spade rudder stock

Chainplates and keelbolts

Sandwich construction

The YD - 40 scantlings

15. Layout

Generic space requirements


Deck layout

16. Design Evaluation

Non-dimensional parameters

The Velocity Prediction Program (VPP)

Towing tank testing

Computational Field Dynamics (CFD)

Appendix 1

Main Particulars of the YD - 40

Appendix 2

Weight calculation

Appendix 3

STIX calculation



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