an increase in tip lift under load causes the wing to tighten into turns, and may result in a spiral dive from which recovery is not possible. In the worst case, the wing structure can be stressed to the point of failure.

At large angles of sweep and high speeds, in order to build a structure stiff enough to resist deforming yet light enough to be practicable, materials such as advanced composites may be required. Composite fibers can also be aligned to influence