Yacht Design School – Lesson 4b

Theory & Practice of Developing Excellence in Hull Lines – Section Shape Considerations, Fairing, and Hull Resistance Reduction

Revised 06/18/2015 – Copyright 2015

 

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

 

What You Will Receive With This Lesson

 

What You Will Learn In This Lesson

Section Shape and Initial Stability

Designing Chines to Avoid Cross Flow

Underbody Smoothness

Turbulence

Wetted Surface

Flow at or Near the Water Surface Versus Submerged Flow

Modeling Flow Over Surface Piercing and Near Surface Bodies

Fully Immersed Streamline Flow

Evaluation of Drag on Fully Submerged Streamlined Bodies

Proper Construction of Streamlined Bodies

Variable Prismatic Coefficient for Low to High Speeds as Boat Changes Trim

Appendix One - Frictional Resistance by the Banding Method

Appendix Two - Foil Development Principles