Now it's time to make the oar blade. The modeling will be a little more complex, so pay close attention to these steps:
Zoom out a little and move the bottom of the oar to the top of 3D View. Move the mouse to the top of 3D View. Have at least eight major grids below the bottom of the oar.
Press E, and move the new edges down 0.8 Blender units, eight of the grid sections. Press the MMB after starting your motion to restrict the motion to Z. Use the Ctrl key while moving the edges for more precision.
Zoom in to the bottom of the oar. Choose the Vertex select mode. Press A to deselect all vertices. Press the RMB to select the left vertex, and then Shift + RMB to select the right vertex on the sides at the bottom, as seen in the following screenshot:
You don't need to rotate the view, but after selecting the vertices, zoom back out so you can see three or more large grid lines on either side.
Press S, X, and use the mouse to scale them in the X axis. Scale them...