Plain English Meaning
A fuselage built like a skeleton of crossed bars and wires, where the framework itself carries all the loads and the outer covering (if any) is just fabric for shape and airflow.
Full Definition
An early form of aircraft fuselage construction in which the structural framework is built from a network of wood or metal members (longerons, struts, and wire bracing) arranged in triangular patterns to carry flight and ground loads. The framework is left exposed or covered with fabric, with no stressed outer skin contributing to strength.
Context Anchor
Seen when studying fuselage construction, especially on older or fabric-covered aircraft with a visible internal frame.
Derivation
‘Truss’ comes from the Old French ‘trousse,’ meaning a bundle or framework tied together. The same word describes the triangulated frameworks used in bridges and roof . ‘Open’ refers to the fact that the framework is visible — not enclosed by a - skin.