International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

This paper examines an improved method for calculating the stiffness and strength of a pre-twisted wing for special-purpose aircraft. These wings represent a type of adaptive wing, the development of which is the subject of active research in many industrialized countries due to the pressing need for improved aerodynamic performance. Such wings are intended for use in experimental aircraft to determine the influence of their aerodynamic parameters over a wide range of angles of attack during twisting during takeoff, landing, and, most importantly, during cruising flight for complex missions. For example, during rescue operations in hard-to-reach areas or the use of military aircraft for special defense missions.
Such variable-geometry wings require comprehensive research using modern methods of strength of materials and elasticity theory. In this regard, the problem being solved is one of the main fundamental issues of structural mechanics of special-purpose aircraft.

This article examines the stiffness calculations for a wing pre-twisted relative to its spar. Such wings can be used in experimental aircraft to study changes in their aerodynamic properties during flight testing at various twist angles. Such variable-geometry wings require comprehensive investigation using strength of materials and elasticity theory. This problem is fundamental to the structural mechanics of aircraft.