Downwash for joined-wing airframe with control surface deflections

Abstract

An experimental and theoretical investigation of the downwash effects for a joined-wing aircraft was conducted. The investigation included the development of an analytical technique using control surface deflections of both the fore and aft wings instead of the usual tail deflection classical approach. Modifications to the basic equations are presented followed by a comparison with experimental data to validate the procedure. The results indicate differences between experiment and the resulting semiempirical method of less than 12%.