# Aeroplane > Lift, thrust and control - Date: 1903 - Era: Electric age - Domain: [Aeronautics](https://lastcodex.org/en/domains/aviation/) - Rebuild stage: V (Electric age) - Difficulty: 5/5 - URL: https://lastcodex.org/en/inventions/airplane/ An aeroplane is a powered machine heavier than air that flies on fixed wings, with an engine to drive it forward and movable surfaces to steer it. Wilbur and Orville Wright made the first controlled, sustained powered flights at Kitty Hawk on 17 December 1903. ![Aeroplane · Lift, thrust and control](https://lastcodex.org/_astro/plate.C5wVNWVw_Zqoomm.webp) ## Legend 1. Forward elevator 2. Upper wing 3. Pilot's hip cradle 4. Engine 5. Drive chain 6. Propeller 7. Twin rudders ## What it is An aeroplane flies because air flowing over its wings holds it up. Unlike a balloon it is heavier than the air it moves through, so it has to keep moving to stay aloft. Three things are needed at once: wings that produce lift, an engine and propeller (or jet) that push the machine forward against drag, and controls that let the pilot keep it balanced and point it where it should go. The machine on this plate is the Wright Flyer of 1903, a biplane of spruce and ash covered in unbleached muslin. The pilot lay face down on the lower wing. A small petrol engine beside him drove two wooden propellers behind the wings through bicycle-type chains. The elevator was at the front and a pair of rudders at the back. It had no wheels and took off from a wooden rail laid on the sand. ## How it works A wing is curved on top and set at a slight angle to the oncoming air. It deflects air downwards, and the air pushes back up on the wing. The pressure above the wing falls and the pressure below rises; the difference, spread over the whole wing area, is the lift. For a given wing and angle, lift grows with the square of the airspeed, so a plane needs a certain minimum speed to fly. Tilting the wing more raises lift only up to a point: beyond it the airflow breaks away from the upper surface and the wing stalls. ![A wing section with streamlines of air bending around it](https://lastcodex.org/_astro/v2.rTFX-n4M_Z1dj2pR.webp) *Air flowing round a cambered wing is turned downwards, and the wing is pushed up in return.* The engine has to overcome drag, the resistance of the air. The Wrights treated their propellers as rotating wings and designed them from their own wind-tunnel data. The two propellers turned in opposite directions so that their twisting effects cancelled out. Control was the Wrights' main contribution. A plane can turn about three axes. Pitch (nose up or down) was set by the forward elevator, worked by a lever in the pilot's left hand. Roll (banking the wings) came from wing warping: by shifting his hips in the cradle, the pilot pulled cables that twisted the wingtips in opposite directions, giving one wing more lift than the other. The same cradle moved the rudders to keep the nose from swinging the wrong way in a turn. Ailerons, hinged flaps on the wings, later replaced warping, but the three-axis principle has not changed. ## How to build it Early aeroplanes were built by small workshops with woodworking and bicycle-making skills. What follows explains the decisions involved and how the pioneers worked. It is not a plan, and nobody should try to fly a home-made aircraft without training, inspection and the legal approvals required in their country. **Test before building.** The Wrights flew gliders in 1900, 1901 and 1902 and built a small wind tunnel in 1901 to measure the lift and drag of model wings. Their own tables replaced older published data they had found to be wrong. **Frame of light, straight-grained wood.** Spars and struts were spruce, curved ribs ash. The structure was a braced box: struts held the two wings apart and steel wires crossed between them. The central bays were rigidly braced, while the outer parts of the wings could twist slightly for warping. **Cover the wings.** Muslin was cut on the bias and stretched over the ribs so the threads ran diagonally, which strengthened the covering. **Find a light engine.** The Wrights could not find a maker willing to supply an engine light and powerful enough, so their mechanic Charlie Taylor built a four-cylinder water-cooled engine in about six weeks. Its crankcase was cast in aluminium to save weight. **Balance it.** Fore and aft, the centre of gravity has to sit at the right place relative to the lift, or the machine pitches up or dives. From side to side the weights must balance too: the engine sat to one side of the pilot, so the Wrights made the right wing slightly longer to compensate. > **Safety.** A turning propeller is invisible and can kill: never stand in its arc, and never start an engine by hand without training. Petrol and its vapour ignite easily. Wood and fabric structures fail without warning if a joint or wire is damaged. Flying requires training, a sound and inspected aircraft and suitable weather. ## History and evolution ![Otto Lilienthal hanging below one of his gliders in the 1890s](https://lastcodex.org/_astro/v1.nc0sxsv2_Z12JKCH.webp) *Lilienthal steered his gliders by swinging his body under the wings.* The modern approach to flight began with George Cayley in England, who around 1799 separated the three problems of lift, propulsion and control and later flew gliders. In Germany in the 1890s Otto Lilienthal made about two thousand glides from hills and published his measurements. He died in 1896 after a crash. Wilbur and Orville Wright ran a bicycle business in Dayton, Ohio. They studied earlier aviation research, including Lilienthal's, then tested their ideas with kites and gliders at Kitty Hawk, North Carolina, chosen for its steady winds and soft sand. ![The Wright brothers' wooden wind tunnel with its belt-driven fan](https://lastcodex.org/_astro/v3.A_JtYCNd_1HD0HU.webp) *In their 1901 wind tunnel the Wrights measured the lift and drag of many small model wings.* On 17 December 1903 Orville flew the Flyer for 12 seconds over about 37 metres (120 feet). The brothers made three more flights that day; the last, with Wilbur at the controls, lasted 59 seconds and covered about 260 metres. A gust then overturned the machine and it never flew again. It has been at the Smithsonian in Washington since 1948. Others soon followed. Alberto Santos-Dumont flew in Paris in 1906, and Louis Blériot crossed the English Channel in 1909. The First World War turned aircraft into an industry. Metal monoplanes replaced wooden biplanes in the 1930s, and jet engines appeared at the end of the decade. Today airliners carry several hundred people across oceans, and their controls still act about the same three axes on which the Wrights first achieved practical control. ## Key figures - First flight: 17 December 1903, 12 seconds, about 37 m - Longest flight that day: 59 seconds, about 260 m (Wilbur Wright) - Wingspan of the 1903 Flyer: 12.3 m - Engine: 4 cylinders, about 12 hp, aluminium crankcase - Weight: 274 kg empty, 341 kg with pilot ## Requires - [Internal Combustion Engine](https://lastcodex.org/en/inventions/combustion-engine/): Small explosions, steady power (1876) - [Aluminium](https://lastcodex.org/en/inventions/aluminium/): Alumina turned into metal by electricity (1886) ## Sources - [1903 Wright Flyer](https://airandspace.si.edu/collection-objects/1903-wright-flyer/nasm_A19610048000), Smithsonian National Air and Space Museum - [The Wright Flyer](https://www.nps.gov/articles/wrightflyer.htm), US National Park Service - [1903 Engine](https://wright-brothers.org/Information_Desk/Just_the_Facts/Engines_&_Props/1903_Engine.htm), Wright Brothers Aeroplane Company - [Otto Lilienthal](https://en.wikipedia.org/wiki/Otto_Lilienthal), Wikipedia - [1903 Wright Flyer Specifications](https://wright-brothers.org/Information_Desk/Help_with_Homework/Wright_Plans/Wright_Plans_images/1903_Wright_Flyer_Specifications_Isometric_11x17.pdf), Wright Brothers Aeroplane Company - [1903 Wright Propellers](https://wright-brothers.org/Information_Desk/Just_the_Facts/Engines_&_Props/1903_Props.htm), Wright Brothers Aeroplane Company - [Wright 1903 Aircraft Engine Parts](https://www.grc.nasa.gov/www/k-12/airplane/engparts.html), NASA Glenn Research Center Fact-checked on 2026-10-11. --- The Last Codex · https://lastcodex.org/en/inventions/airplane/ · © The Last Codex. 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