Another was the 'Ornithopter'. This also was similar to a helicopter. The ornithopter is one of many intriguing ideas created by Leonardo da Vinci. Although these inventions were never carried through to completion, the drawings for them are skillful. The ornithopter was the result of the artist’s interest in the flight of birds. Leonardo was very interested in aerodynamics. This was the first aircraft that could use human body power. He drew it around the 15th century. The aircraft had a flapping wing though as far as we know Leonardo never built his machine. Leonardo's ornithopter would probably not have flown because it was too heavy.