Yacht Design School – Lesson 4
Theory & Practice of Developing Excellence in Hull Lines
Revised 01/15/2006
Books To Be Read With This Lesson
Aero-Hydrodynamics of Sailing by C.A. Marchaj
Theory of Wing Sections by Ira H. Abbott and Albert E. Von Doenhoff (highly
optional)
Modern Subsonic Aerodynamics by R.T. Jones (highly optional)
Minimum New Tools for This Lesson
No new tools needed
What You Will Receive With This Lesson
Lines Faired With Waterlines, Buttock Lines & Sections (Diagonals Afterward)
Lines Faired With Sections & Diagonals (Waterlines & Buttock Lines Done Afterward)
YDS Development Class Lines Starting Point
What You Will Learn In This Lesson
Introduction to the Three “Excellence” Lessons
The Presumed Effect on Performance of Each Line Type
Problems in Judging Each Line Independently
Avoidance of Thinking of Buttock Lines as Suitable Fairing Lines
Avoidance of Thinking of Waterlines as Suitable Fairing Lines
Using Diagonals to End the Confusion
When Optimum Waterlines Would Be Hollow or Convex Forward or Aft
Step by Step Procedure for Developing the Best Lines
Example of Hull Drawn Without Using Diagonals
Improvement of the Example Hull Using Diagonals to Control the Other Lines
Mention of Lesson Five Model Making for Developing Lines
History of Fairing With Diagonals
Examination of the Differences in Developing Planing Hulls
Planing Hulls as an Extreme Case
Bustle Sterns and Immersed Transoms
Bow and Forefoot Shapes for Best Performance