Super Slender Racing Yachts - An alternative to a modern trend

SYNOPSIS

The current development trends for both model and full size yachts are discussed, and related to each other. The advanced development in the model field concentrating mainly on the Radio Marblehead class is explained, and the sailing performance of the models is examined. A test model fitting the RM class is produced and its design and construction process is explained. The sailing performance of the test model is analysed, and critical areas are established.

The test model is then scaled to full size and a wider model hull form is also scaled up, so a comparison can be established. The performance of the full size yachts are analysed using a V.P.P and a comparison between the two yachts is made. Other aspects of design such as motion and structural design are then looked at, and related back to the two different hull forms.

The hull and appendages of the scaled up models are then modified with regard to the previous sections, and values for keel length and sail area are looked at. The length of the vessel is considered with respect to accommodation and crew size. The application of the vessel is also considered and racing classes are looked at, and suitable classes are discussed.

Contents

CHAPTER 1 - INTRODUCTION

1.1 Introduction

1.2 Aims

1.3 Review on Model Yacht Development

1.4 Full Size Yacht Development

CHAPTER 2 - MODEL ANALYSIS

2.1 Problems with model slender hulled yachts

2.2 Design Process for Test Model

2.2.1 Hull Design

2.2.2 Nose Diving

2.2.3 Sail and Rig Choice

2.2.4 Keel and Rudder design

2.2.5 Construction

2.3 Results of sailing trials

2.4 Analysis of test results

CHAPTER 3 - FULL SIZE ANALYSIS

3.1 Introduction

3.2 Performance analysis

3.2.1 V.P.P Run 1

3.2.2 V.P.P Run 2

3.2.3 V.P.P Run 3

3.3 Stability tests

3.4 Motion

3.4.1 Aerodynamic induced Roll

3.4.2 Wave induced Roll

3.4.3 Pitch Poling and Broaching

3.4.4 Capsize Risk

3.5 Accommodation

3.6 Structural Considerations

CHAPTER 4 - MODIFICATION OF HULL AND APPENDAGES

4.1 Introduction

4.2 Keel Length

4.3 Sail Area

4.5 Types of Rig

4.5.1 V.P.P Run 4

4.6 Overall Length of the vessel and hull shapes

4.7 Applications

CHAPTER 5 - CONCLUSION

5.1 Conclusion

5.2 Update

REFERENCES

BIBLIOGRAPHY