What are the types of aircraft structures?

The types of aircraft structures are primarily categorized based on their design and construction methods. The correct identification of these structures includes monocoque, semi-monocoque, and truss.

Monocoque structures utilize a single shell to support loads, which allows for a lightweight yet strong design by distributing stress across the entire surface. This structure minimizes the need for additional support frameworks, enhancing the overall efficiency of the aircraft's design.

Semi-monocoque structures, on the other hand, incorporate a combination of a shell and internal structures that provide additional stability and strength. This design is prevalent in modern aircraft because it allows for greater load-bearing capacity while maintaining a reasonable weight.

Truss structures are a simpler form, using interconnected rods or beams to distribute loads. Typically found in smaller aircraft or older designs, truss structures provide a robust framework but often result in a heavier structure.

Other options such as composite, aluminum, and steel reference materials used in aircraft construction rather than structural types, while fiberglass, titanium, and balsa wood denote specific materials with applications in aircraft design but do not represent structural types themselves. Understanding the distinction between these classifications helps in the comprehension of aircraft design and engineering principles.