What is the term for the flat portion of a propeller blade that resembles the bottom portion of an airfoil?

• A. Blade face
• B. Blade root
• C. Blade tip
• D. Blade edge

Answer: (A)

The main idea here is understanding blade surfaces. A propeller blade has two main sides: the face and the back. The blade face is the flatter surface that resembles the underside of an airfoil, while the back is the more curved side that forms the camber. The root is where the blade attaches to the hub, the tip is farthest from the hub, and the edge is the boundary line along the blade. So the flat portion described is the blade face.