The Italian

polymath A polymath or polyhistor is an individual whose knowledge spans many different subjects, known to draw on complex bodies of knowledge to solve specific problems. Polymaths often prefer a specific context in which to explain their knowledge, ...

Leonardo da Vinci Leonardo di ser Piero da Vinci (15 April 1452 - 2 May 1519) was an Italian polymath of the High Renaissance who was active as a painter, draughtsman, engineer, scientist, theorist, sculptor, and architect. While his fame initially rested o ...

drew his design for an "aerial screw" in the late 1480s, while he was employed as a military engineer by

Ludovico Sforza Ludovico Maria Sforza (; 27 July 1452 – 27 May 1508), also known as Ludovico il Moro (; 'the Moor'), and called the "arbiter of Italy" by historian Francesco Guicciardini,

Duke of Milan Milan was ruled by dukes from the 13th century to 1814, after which it was incorporated into the Kingdom of Lombardy–Venetia by the Congress of Vienna. List of dukes of Milan House of Visconti In 1395, Gian Galeazzo Visconti was titled Duke ...

from 1494 to 1499. The original drawing is part of a manuscript dated to 1487 to 1490 and appears on folio 83-verso of , part of the papers removed from the

Biblioteca Ambrosiana The Biblioteca Ambrosiana is a historic library in Milan, Italy, also housing the Pinacoteca Ambrosiana, the Ambrosian art gallery. Named after Ambrose, the patron saint of Milan, it was founded in 1609 by Cardinal Federico Borromeo, whose age ...

in 1795 by

Napoleon Napoleon Bonaparte (born Napoleone di Buonaparte; 15 August 1769 – 5 May 1821), later known by his regnal name Napoleon I, was a French general and statesman who rose to prominence during the French Revolution and led Military career ...

and still held by the

Institut de France The ; ) is a French learned society, grouping five , including the . It was established in 1795 at the direction of the National Convention. Located on the Quai de Conti in the 6th arrondissement of Paris, the institute manages approximately ...

in Paris. Leonardo biographer

Walter Isaacson Walter Seff Isaacson (born May 20, 1952) is an American journalist who has written biographies of Henry Kissinger, Benjamin Franklin, Leonardo da Vinci, Albert Einstein, Steve Jobs, Jennifer Doudna and Elon Musk. As of 2024, Isaacson is a profes ...

has expressed the belief that it was “devised for a theatrical spectacle”. The "aerial screw" was one of several aerial machines drawn by Leonardo, including an early

parachute A parachute is a device designed to slow an object's descent through an atmosphere by creating Drag (physics), drag or aerodynamic Lift (force), lift. It is primarily used to safely support people exiting aircraft at height, but also serves va ...

, an

ornithopter An ornithopter (from Greek language, Greek ''ornis, ornith-'' 'bird' and ''pteron'' 'wing') is an aircraft that flies by flapping its wings. Designers sought to imitate the flapping-wing flight of birds, bats, and insects. Though machines may dif ...

and a

hang glider Hang gliding is an air sport or recreational activity in which a pilot flies a light, non-motorised, fixed-wing heavier-than-air aircraft called a hang glider. Most modern hang gliders are made of an aluminium alloy or composite frame covered ...

. The pen-and-ink

sketch Sketch or Sketches may refer to: * Sketch (drawing), a rapidly executed freehand drawing that is not usually intended as a finished work Arts, entertainment and media * Sketch comedy, a series of short scenes or vignettes called sketches Fil ...

outlines an idea for a flying machine similar to a modern

helicopter A helicopter is a type of rotorcraft in which Lift (force), lift and thrust are supplied by horizontally spinning Helicopter rotor, rotors. This allows the helicopter to VTOL, take off and land vertically, to hover (helicopter), hover, and ...

, with a spiral rotor or "aerial screw" based on a

water screw A screw pump is a positive-displacement pump that use one or several screws to move fluid solids or liquids along the screw(s) axis. History The screw pump is the oldest positive displacement pump. The first records of a water screw, or screw ...

, but intended to push against the fluid of the air instead of water. The design comprises a large structure, built on a solid circular platform, with a central vertical pole supported by three diagonal members meeting at a small circular plate about halfway up the pole. The upper half of the pole is the supportive axis for a large spiralling sail of linen with a radius of about , stiffened with starch. The inner edge of the sail winds clockwise around the pole, while the outer edge of the sail is connected by ropes or wires to a ring that rotates around the lower platform. The design envisions a crew of several people on the wooden platform running around the central pole while holding handles that rotate the sail. Leonardo's annotations suggest that a linen aerial screw, if turned quickly enough, would push against the air and lift the structure into the air. The notes indicate that Leonardo built small flying models of the aerial screw, but there were no indications for any provision to stop the reaction against the rotation of the sail from making the craft itself rotate in the opposite direction. It is conceivable that Leonardo could have constructed small working models, but a full-size working version could not have been realised due to the lack of sufficiently light but strong materials, and a powerful enough drive for the screw. In 2022 a drone based on Leonardo's design was made by a team of engineers from

University of Maryland The University of Maryland, College Park (University of Maryland, UMD, or simply Maryland) is a public land-grant research university in College Park, Maryland, United States. Founded in 1856, UMD is the flagship institution of the Univ ...

and was presented at a conference in San Jose. Macchina volante - Museo scienza tecnologia Milano 09392 01.jpg, Model in the

Museo Nazionale Scienza e Tecnologia Leonardo da Vinci Museo Nazionale Scienza e Tecnologia Leonardo da Vinci in Milan, dedicated to painter and scientist Leonardo da Vinci, is the largest science and technology museum in Italy. It was opened on 15 February 1953 and inaugurated by prime minister of ...

, Milan DaVinci Helix Hubschraubermuseum Bueckeburg.jpg, Model in the

Hubschraubermuseum Bückeburg The Hubschraubermuseum Bückeburg (Bückeburg Helicopter Museum) is located in the German town of Bückeburg, 30 miles (50 km) to the west of Hanover. The museum is the sole museum in Germany specialising in rotary-wing flight and one of few ...

References

Folio83-verso, Manuscrit B
Institut de France

Leonardo3 Museum Leonardo3 is an interactive museum and exhibition center at Galleria Vittorio Emanuele II, Piazza della Scala, Milano, Italy. The museum was inaugurated in 2013, and is devoted to Italy’s notable personality Leonardo da Vinci, who is portrayed ...

Leonardo da Vinci's helicopter: 15th-century flight of fancy led to modern aeronautics
''The Conversation'', 3 May 2019
Leonardo da Vinci's Aerial Screw
COVE, 22 May 2019 {{Leonardo da Vinci Helicopters Leonardo da Vinci

See also

References