Which type of wood is NOT commonly used in aircraft construction?

In aircraft construction, solid, laminated, and plywood are all types of wood commonly employed because they offer desirable strength-to-weight ratios and structural integrity. Each of these wood types has specific properties that make them suitable for various applications within an aircraft.

Laminated wood, for example, is created by bonding several layers of wood together, which enhances strength and resistance to warping. Plywood consists of thin layers of wood veneer that are glued together in alternating grain directions, creating a strong, lightweight material ideal for certain structural components in aircraft. Solid wood, while not as frequently used as the other types, is sometimes employed in smaller components or specific applications where material properties are suited.

In contrast, MDF, or Medium Density Fiberboard, is not commonly utilized in aircraft construction. This material is primarily made from wood fibers combined with adhesives under heat and pressure, resulting in a dense, uniform board. While MDF has applications in furniture and cabinetry due to its smooth surface and ease of machining, it lacks the necessary strength, light weight, and durability required in aircraft structures. Hence, choosing MDF as an option highlights a fundamental understanding of materials unsuitable for aeronautical engineering.