This device, which will be considered the ancestor linked to modern helicopter,appears in a drawing dated around 1480 present theCodex Atlanticus. Leonardo describes the master arrange for an “aerial screw”imagining it as a worm screw with a diameter of around 5metres, inside their motives, it has “screwed it self” in environment takingadvantage of its depth. Relocated by the muscle mass energy of four menwalking regarding main platform, it has a wooden structurecovered with starched linen material. Since there is no proof that Leonardoactually built the apparatus he imagined, it stays certainly one of hismany theoretical insights.