फ्री वीडियो देखें How it Works - Propeller of the Helicopter

The video illustrates the behavior of the the propellers of a helicopter because of the effect soil produced by the wind which hit against the soil. Animation by Juan Francisco Galera Campos under the supervision of Juan Carlos Cantos Mateo (Graduated in Technical Engineering at the Escuela Técnica Superior de Ingeniería, University of Seville)