The controls for the Bezier Curves work in a similar manner as the controls for the F-Curve. You have a control point that represents a particular location in space and two control handles that control how the curve approaches and departs from the control point. Check Chapter 3, Controlling the Lamp, the Camera, and Animating Objects again if you need a reminder on how they work:
Select the scaling reference cube. Press M, 2, and Enter to move it to layer 2 so it won't be in your way.
Press Shift+S and select Cursor to Center from the menu. Use Shift+MMB to center your view on the top of the rudder, and Ctrl+MMB to zoom into the rudder. Check the diagram earlier in the chapter if you don't remember what the rudder is. Move the 3D Cursor to the top-right corner of the rudder as shown in the following screenshot.
Press Shift+A and select Curve and then Bezier as shown in the following screenshot:
By default, the Bezier Curve is facing upwards...