What is the primary function of a joggle in aircraft construction?

The primary function of a joggle in aircraft construction is to allow multiple metal sheets to stack flat. A joggle is a specific type of bend or offset made in a metal sheet that creates a step or rise, enabling it to fit smoothly with adjacent sheets. This design feature is particularly important when joining sheets in areas where they may overlap or need to be riveted together, ensuring a flush assembly that contributes to the overall smoothness and structural efficiency of the aircraft's skin.

This flush stacking is essential because it minimizes drag and allows for proper sealing, which is critical not only for structural integrity but also for maintaining aerodynamic performance. While joggles may indirectly contribute to other aspects such as enhancing aerodynamic characteristics or reinforcing structural integrity, their primary purpose is indeed to facilitate the flat stacking of metal sheets.