Leonardo da Vinci’s armored vehicle was designed to be operated by eight men. His late-15th-century concept combined a conical protective shell with internal cranks that crew members would turn to drive the vehicle’s wheels.
The vehicle is commonly described as an early tank design, although it was never built or used in battle during Leonardo’s lifetime. The sloping armor was intended to deflect incoming projectiles, while the elevated platform could carry light guns around the vehicle’s perimeter.
The crew arrangement reveals a major practical limitation: eight people would have had to coordinate their effort inside a cramped, heavily protected machine. A frequently discussed feature is an apparent gearing error in Leonardo’s drawings that would have made the vehicle move backward rather than forward. Some historians suggest the error may have been deliberate, preserving the design’s military secrecy.
Modern reconstructions have shown that the concept can be made mobile after correcting its mechanism.