The wing, tail or other appendage is driven aerodynamically when passing through a relative wind by virtue of the fact that a turning...http://www.google.com/patents/US4114308?utm_source=gb-gplus-sharePatent US4114308 - Aerodynamically driven toyAdvanced Patent SearchPublication numberUS4114308 APublication typeGrantApplication numberUS 05/819,351Publication dateSep 19, 1978Filing dateJul 27, 1977