What describes a truss fuselage design?

• A. A fuselage built from monocoque skin and frames.
• B. A fuselage design made up of supporting structural members that resist deformation by applied loads, formed into triangular trusses.
• C. A fabric-covered frame with wooden stringers.
• D. A welded aluminum wing with no internal frames.

Answer: (B)

A truss fuselage uses a framework of many straight structural members connected to form triangular units. Triangles are inherently stiff, so when the fuselage is loaded—by engine forces, landing gear, cabin pressure, or aerodynamic loads—the forces are carried and redistributed through the network of members. This triangulated skeleton maintains shape and resists bending and twisting, providing strength with relatively light weight. The skin can cover this frame, but the essential load paths go through the internal triangular members rather than primarily through the skin.

Other designs emphasize different load-bearing strategies: monocoque relies on the skin and key frames to carry most of the loads; a fabric-covered frame uses a lighter framework with fabric as a cover and less rigid framing; and a structure described as a wing with no internal frames wouldn’t provide the necessary stiffness or load paths for a fuselage.