The small, approximately 2 inches long, objects, made of gold are estimated to be at least 1,000 years old. They were discovered in Central America. For scientists the artifacts were depicting animals and were classified as Sinu, a pre-Inca culture from A.D. 500 to 800… But only for them. For aeronautical engineers these objects more looked like airplanes with delta-shaped wings. So in 1997 they built a scaled up version of the objects to the exact specifications of the prototypes with the simple addition of an engine and propeller. The test was succesful. The radio controlled aircraft flew performing airborn loops, rolls and other manuevers, and then performed perfect landing.