Yacht Design School – Lesson 4c

Theory & Practice of Developing Excellence in Hull Lines – Appendage Development and Fairing & Final Considerations in Developing Lines

Revised 03/19/2020 – Copyright 2020


Books To Be Read With This Lesson

            Aero-Hydrodynamics of Sailing by C.A. Marchaj (extremely valuable)

            Fluid Dynamic Drag by Dr. Sighard Hoerner (extremely valuable)

            Fluid Dynamic Lift by Dr. Sighard Hoerner, co-author & editor Henry V. Borst (extremely valuable)
            GA Airfoils by Harry Riblett (extremely valuable)

            Theory of Wing Sections by Ira H. Abbott and Albert E. Von Doenhoff (highly optional, use only with Riblett)

            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

            Fillet Development - In Light of General Fluid Flow & Boundary Layer Interference

            Fillet Development - Boundary Layer Interference

            Fillet Development - To Relieve Boundary Layer Interference at Surface Intersections
            Fillet Development - in the Case of a Rockered Flat Bottom

            Fillet Development - In the Case of a Hull with Rocker and Deadrise

            “Appropriate or Inappropriate” Versus “Modern or Old Fashioned” Characteristics

            Avoiding Foreign Object Drag in Bulb Keels

            Intersection of Bulbs with Keels and Struts

            Avoiding Drag in SWATH Hull Bulbs

            Ultimate Result in Dealing with Bulb Problems

            Bulbous Bows

            Foil Lift Versus Vortex Lift

            Choosing Spade Rudders, Skeg Hung Rudders, or Keel Hung Rudders Rationally

            Avoidance of Laminar Flow Foils in Non-Dry Sailed Yachts

            Avoidance of Laminar Flow Foils in Rudders

            Mistake of Picking One Factor in Speed Production and Emphasizing It Beyond Reason

            Distortions Introduced by the Racing Rules

            Why We Devote So Many Lessons to Lines Characteristics

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