Effect of Stabilizer Dihedral and Static Lift on T-Tail Flutter

The importance of stabilizer dihedral and static lift forces on T-tail flutter speeds is discussed. Based upon strip theory considerations the additional unsteady aerodynamic forces derived from these static forces are introduced into the generalized air forces of the system. The importance and introduction of structural deformations caused by such static forces also are considered. These effects are confirmed by the results of flutter tests on a low-speed flutter model.