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    • Navalapp
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    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
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    Topics: Geometry | Keel | Rudder
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    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
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    Topics: Basics | Sailing | Wind
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    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
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    Topics: Basics | Sailing | Wind
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    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
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    Topics: Added resistance | Frictional resistance | Hydrodynamics | Induced resistance | Residuary resistance | Resistance | Wave-making resistance
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    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
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    Topics: Ocean | Waves | Wind
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    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…
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    Topics: Ocean | Waves | Wind
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    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
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    Topics: Hull | Hydrodynamics | Resistance | Wave-making resistance
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    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
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    Topics: Geometry | History | Hull | Keel
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    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
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    Topics: Geometry | History | Hull | Keel
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    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
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    Topics: Geometry | Hull
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    Beautiful bay with sailing boat in Mediterranean sea.

    Introducing the hull

    The hull provides a volume to house accommodation, machinery, supplies, and cargo. It has to be seaworthy enough for the routes the yacht will sail an…
    Navalapp
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    Topics: Geometry | Hull | Parameters
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