Navalapp logoNavalapp logo, white.
  • Navalapp
    • About
    • Memberships
    • Contact
  • Courses
    • All Courses
    • Sailing Yacht Design 1
    • Sail Design 1
    • Scantling with ISO 12215
  • Articles
    • All Articles
    • Navalapp
    • Guests
  • Calculations
    • All Calculations
    • Member access
      • All Members
      • Advanced & Pro only
      • Pro only
    • Scope
      • Boat / Yacht
      • Hull
      • Appendages
        • Keel
        • Rudder
      • Sails
        • Mainsail
        • Headsails
        • Spinnakers
        • Sails Sets
      • Wings
      • Environment
    • Hydrodynamics
      • Frictional Resistance
      • Pressure Resistance
      • Viscous Resistance
      • Residuary Resistance
      • Added Resistance
      • Total Resistance
    • Aerodynamics
      • Coefficients
        • Sails
        • Sails Sets
      • Forces
        • Sails Sets
    • Aero – Hydro
      • Lift
      • Lift-induced Drag
  • Community
    • Activity
    • Forums
    • Groups
    • Members
    • Photos
    • Videos
    • Documents
  • Merch
    • All Merch
    • Posters
    • Mugs
    • T-shirts
    • Hoodies

    Cart

    No products in the cart.

    Sign in Sign up
    Navalapp logoNavalapp logo, white.

    Cart

    No products in the cart.

    Navalapp logo

    • Navalapp
      • About
      • Memberships
      • Contact
    • Courses
      • All Courses
      • Sailing Yacht Design 1
      • Sail Design 1
      • Scantling with ISO 12215
    • Articles
      • All Articles
      • Navalapp
      • Guests
    • Calculations
      • All Calculations
      • Member access
        • All Members
        • Advanced & Pro only
        • Pro only
      • Scope
        • Boat / Yacht
        • Hull
        • Appendages
          • Keel
          • Rudder
        • Sails
          • Mainsail
          • Headsails
          • Spinnakers
          • Sails Sets
        • Wings
        • Environment
      • Hydrodynamics
        • Frictional Resistance
        • Pressure Resistance
        • Viscous Resistance
        • Residuary Resistance
        • Added Resistance
        • Total Resistance
      • Aerodynamics
        • Coefficients
          • Sails
          • Sails Sets
        • Forces
          • Sails Sets
      • Aero – Hydro
        • Lift
        • Lift-induced Drag
    • Community
      • Activity
      • Forums
      • Groups
      • Members
      • Photos
      • Videos
      • Documents
    • Merch
      • All Merch
      • Posters
      • Mugs
      • T-shirts
      • Hoodies
    Sign in Sign up

    Articles

    Catamaran with foils

    Considerations about the design of a sailboat

    Although the borders of different hull concepts are not always clear, the main governing parameters when designing a sailboat in terms of performance are: Keelboats…

    Markku Hentinen
    Topics: Boat / Yacht | Design | Guests | Markku Hentinen | Performance
    Read
    Sailing yacht going before storm.

    Performance aspects at different points of sailing

    The forces and moments affecting a sailing boat vary a lot depending on points of sail, but also on wind strength and waves. The same…

    Markku Hentinen
    Topics: Boat / Yacht | Design | Guests | Markku Hentinen | Performance | Requirements | Sailing
    Read
    Dynamic team struggle to the regatta sailing ship

    Understanding the boundary layer

    In 1904, Ludwig Prandtl introduced an approach to understanding and analyzing flows around bodies that produced a massive breakthrough: the boundary l…
    Navalapp
    Topics: Aero - Hydro | Aerodynamics | Hydrodynamics
    Read
    Sailing yacht beating upwind

    Bernoulli’s principle

    The physical significance of Bernoulli's equation is what is known as Bernoulli's principle. It states that when the velocity of a fluid increases, th…
    Navalapp
    Topics: Aero - Hydro | Aerodynamics | Hydrodynamics
    Read

    Flows in sailing

    Sailing boats interact with flows of two very different fluids: air and water. Moreover, sailing boats are able to make their way through the water su…
    Navalapp
    Topics: Aero - Hydro | Aerodynamics | Hydrodynamics
    Read

    International Measurement System: Sails

    The International Measurement System (IMS) is a set of rules that define what and how is measured on a boat. It is used by the Offshore Racing Congres…
    Navalapp
    Topics: Geometry | IMS | ORC | Parameters | Rating | Sails
    Read

    Challenges in sailboat design

    Using wind power and sails as the primary means of propulsion brings additional dimensions to the design of a sailboat compared to ship or powerboat d…
    Markku Hentinen
    Topics: Boat / Yacht | Design | Guests | Markku Hentinen | Resistance
    Read
    Sailing yacht race. Yachting sport

    Added resistance in waves: “Pinkster” solver versus “Keuning 2006” comparison

    In 1980, Johannes Albert Pinkster defended his doctoral thesis "Low frequency second order wave exciting forces on floating structures". His work focu…
    Jean-François Masset
    Topics: Added resistance | Boat / Yacht | Guests | Hydrodynamics | Waves
    Read
    Wind sea waves

    Sea state and wave forecasting

    The performance of a sailing boat is affected by the presence of surface waves. To understand how the waves influence the boat's performance, we need …
    Navalapp
    Topics: Environment | Ocean | Waves | Wind
    Read
    Long Period Swell Approaching Coastline

    Wind-generated sea waves

    Wind-generated waves occur when the wind blows over the surface of the sea. They are divided into gravity waves (wind sea, and swell) and capillary wa…
    Navalapp
    Topics: Environment | Ocean | Waves | Wind
    Read

    Hull appendages, planforms, and wing sections: what are they?

    Fin keels and rudders have become the standard configuration nowadays for racing and cruising yachts and everything in between, be it inshore or offsh…
    Navalapp
    Topics: Geometry | Keel | Rudder
    Read
    Sailing at Mediterranean Sea. Super sailing yacht. The Superyacht Cup Palma

    Wind triangle

    The wind experienced by a fixed observer (true wind) is not the same wind an observer on a moving yacht will feel (apparent wind). The wind triangle h…
    Navalapp
    Topics: Basics | Sailing | Wind
    Read

    Points of sail

    The points of sail refer to the course a boat is sailing in relation to the wind. They are defined in reference to the wind angle, which is the angle …
    Navalapp
    Topics: Basics | Sailing | Wind
    Read
    Sailing yacht reaching

    What the hydrodynamic resistance is and why it matters

    The motion of a sailing yacht through water requires energy to overcome resistance. It is essential to know the mechanisms behind the generation of th…
    Navalapp
    Topics: Added resistance | Frictional resistance | Hydrodynamics | Lift-induced drag | Residuary resistance | Resistance | Wave-making resistance
    Read
    The air-water interface

    The air-water interface

    Water and air are two different fluids that enter into contact at the ocean's surface at what is called the air-water interface. This interface plays …
    Navalapp
    Topics: Environment | Ocean | Waves | Wind
    Read
    Surface waves. Aerial view to tropical sandy beach and blue ocean. Top view of ocean waves reaching shore on sunny day. Palawan, Philippines.

    Surface waves

    Surface waves are created by disturbance forces applied to a specific area. It can be either the wind, a surface vessel moving through the water, an e…
    Navalapp
    Topics: Environment | Ocean | Waves | Wind
    Read
    Hull model being tested in a test tank.

    What is the Froude number?

    The Froude number is a dimensionless number used to quantify the influence of gravity on the motion of a fluid. It is the ratio of the inertia forces …
    Navalapp
    Topics: Hull | Hydrodynamics | Resistance | Wave-making resistance
    Read
    Schooner sails over the ocean waves in the bay near a harbor.

    The evolution of hull and keel forms – Part 2

    British "plank-on-edge" suffered from poor form stability. Yet, the deep down located ballast offered a considerable amount of weight stability and po…
    Navalapp
    Topics: Geometry | History | Hull | Keel
    Read
    Classic pilot cutter sailing

    The evolution of hull and keel forms – Part 1

    Until the 19th century, the art of yacht design had been mainly influenced by tradition, economic and commercial motivations, understanding of materia…
    Navalapp
    Topics: Geometry | History | Hull | Keel
    Read
    Sail boat under the storm, detail on the winch

    The lines drawing: what it is and how to read it

    The lines drawing is the conventional graphical representation of the hull. In the lines drawing, the hull's shape is represented by three different v…
    Navalapp
    Topics: Geometry | Hull
    Read
    Load More

    Site

    • Navalapp
    • Courses
    • Articles
    • Calculations
    • Memberships
    • Merch
    • About
    • Contact

    Community

    • Community
    • Activity
    • Forums
    • Groups
    • Members
    • Photos
    • Videos
    • Documents

    Legal

    • Site Terms
    • Customer Agreement
    • Service Level Agreement
    • Acceptable Use Policy
    • Privacy Policy
    • Cookies Policy
    • Affiliates

    Don't you have an account yet?

    Sign up

    Already a member?

    Sign in
    Navalapp. Sailing Yachts Design & Performance
    © 2022 - Navalapp. All rights reserved

    Sailing Yacht Design & Performance

    Report

    Harassment or bullying behavior
    Contains mature or sensitive content
    Contains misleading or false information
    Contains abusive or derogatory content
    Contains spam, fake content or potential malware

    Block Member?

    Please confirm you want to block this member.

    You will no longer be able to:

    • See blocked member's posts
    • Mention this member in posts
    • Invite this member to groups
    • Message this member
    • Add this member as a connection

    Please note: This action will also remove this member from your connections and send a report to the site admin. Please allow a few minutes for this process to complete.

    Report

    You have already reported this
      Clear Clear All