This tutorial shows how to design and analyze a hydrofoil (L-Foil) using the 3DFoil/MultiSurface Aerodynamics software. More information can be found at: We perform the following steps: 1. Design the horizontal foil. Set dimensions and define airfoils. 2. Design the vertical section of the L-Foil. 3. Design the transitional section. 4. Analyze the hydrofoil using 3DFoil. 5. Modify the airfoil shape and perform a second analysis. More information about 3DFoil can be found at .