What Leonardo da Vinci invention used a rotating drum to help lift heavy loads?

Leonardo da Vinci’s revolving crane used a rotating drum and lifting mechanism to raise heavy materials.

Leonardo designed and documented cranes and hoisting devices while studying construction and engineering. A revolving crane could combine a vertical support, a pivoting arm, ropes, and a drum turned by human or animal power. Rotating the drum wound the rope and lifted the load.

These machines were not isolated inventions created from nothing. Renaissance engineers inherited hoisting principles from ancient and medieval builders, then improved them through better gearing, pulleys, and mechanical layouts. Leonardo’s contribution was his detailed analysis and systematic drawings of how the parts could work together.

The phrase revolving crane can refer to several related designs in Leonardo’s notebooks, so it is more precise than calling every drawing a modern tower crane. His machines were intended for building work and material handling, not for flight or battlefield transport.