wks20000 ® 20-Май-2017 13:36

PRACTICAL JUNK RIG Design, Aerodynamics and Handling


Year: 1988
Language: english
Author: HG Hasler, JK McLeod
Genre: Technical book
Publisher: Adlard Coles Nautical
Edition: first
ISBN: 978-0-7136-6975-6
Format: PDF
Quality: eBook
Pages count: 255
Description: PRACTICAL JUNK RIG Design, Aerodynamics and Handling
This book is intended to provide a primer for those who want to study the rig
in detail. It describes the process of designing a rig for any specific boat, rigging
it, and sailing it. It is written equally for the amateur owner and for the
professional designer who may be approaching the subject for the first time.
The authors' qualifications are simply that we have worked together on the
development of the Chinese rig for 25 years, using it on our own boats and
designing rigs for other yachtsmen in various parts of the world. Between us we
have sailed at least 65,000 miles of open sea with it, including ten crossings of
the North Atlantic. The more we sail with it the more we like it, and this is true
both on ocean passages and when cruising in coastal waters.
Our most distinguished client is undoubtedly Bill King, whose 42 ft (12.8m)
Galway Blazer II (pg 215 and Fig 16.3) carried him across 40,000 miles of
ocean singlehanded before he sold her to Peter Crowther for further voyaging.
We believe that she may have been the first junk-rigged vessel in history to have
sailed round the world or round the Horn.
We are not experts on the vessels of the China coast, nor in the history of the
rig, but hope that some of the references in the Bibliography will help readers
whose interest lies in that direction. Inevitably this list is incomplete, as is our
knowledge of the work done by other Western designers.
Additional info: Copyright © HG Hasler and JK McLeod 1988
First published 1988
Reprinted 1996
First paperback 2004
Reprinted 2007, 2011
Print ISBN 978-0-7136-6975-6
Ebook PDF ISBN: 978-1-4081-2709-4
Epub ISBN: 978-1-4081-8221-5

Contents

Content
Foreword ix
Preface to the Hardback Edition x
Preface to the Paperback Edition xi
PART I THE CHINESE RIG
Introduction 3
1 The Rig 10
The mast 13
Battens 13
The sail 16
Aerodynamics and the junk rig 18
2 The Geometry of the Sail 19
Sail analysis 20
Basic sail shapes 22
Recommended sail form 30
3 The Rigging of the Sail 32
Halyards 32
Yard hauling parrel 37
Mast line 39
Mast rake 40
Control of the boom 42
Sailcloth creasing 42
Batten downhauls 48
Yard downhaul 49
Topping-lifts 50
4 The Sheets 56
Sheet power and sheet spans 56
Reefing and furling 62
Six-point sheeting system 66
Positioning lower sheet blocks 70
5 Ghosters and Lightning Conductors 78
Ghosters 78
Lightning Conductors 82
PART II DESIGNING A RIG
Introduction 87
6 Designing the Sailplan (1) 90
Position of the sailplan 90
The sailplan 94
Drawing the sail 103
Summary: drawing a standard Chinese sail 110
7 Designing the Sailplan (2) 114
Positioning a single-sailed rig 114
Positioning a multi-sailed rig 114
Unacceptable mast positions 115
Unacceptable sheet positions 116
Suggested solutions 116
Positioning the lower sheet blocks 119
Summary: designing a sailplan (2) 119
8 Masts 120
Timber masts 122
Species of timber 124
Hollow timber masts 124
Gluing 126
Preservation of a timber mast 127
Cable fastening 128
Designing and drawing a hollow mast 128
Designing a hollow staved timber mast 132
Designing a grown mast 132
Mast fittings 133
Masts of other materials 138
9 Partners and Mast Step 141
The partners 141
The mast step 145
Tabernacles 148
10 Yards, Battens, and Boom 151
The yard 151
The battens 154
The boom 159
11 The Sail 163
The scale outline 163
Detail drawing and specification 163
12 The Rigging 171
The halyard 172
The Sheets 176
Topping-lifts 178
Mast lift 179
Parrels 179
Tackline 180
Lacings 180
Optional rigging items 180
13 Cockpit and Deck Layout 181
Boom gallows 181
Lower sheet blocks 183
Rope leads 183
Cleats, hitches, and jammers 184
Stowage of spare rope 185
Integrated deck layouts 187
PART in USING THE RIG
14 Setting up the Rig 197
General points 197
Stepping and unstepping the mast 197
Dressing the mast 201
Rigging the sail 202
15 Handling the Rig 204
Sail-handling 204
Maintenance 210
Repairs and emergency procedures 210
Correction of excessive lee/weather helm 215
16 Specimen Chinese-Rigged Vessels 216
Jester (1960) 216
Redlapper (1962) 216
Galway Blazer II (1968) 218
Ron Glas (1970) 220
Yeong (1972) 222
Sumner (1972) 223
Design SSF/1 (1973) 225
Hum (1974) 227
Batwing (1974) 228
Pilmer (1975) 229
APPENDICES
A Imperial/metric equivalents 232
B Inches as decimals of a foot 232
C Update to Practical Junk Rig by
the Junk Rig Association 233
Bibliography 235
Index 237

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