Canard (aeronautics)
A small foreplane forward of the main wing.
In aeronautics, a canard—French for "duck"—refers to a design where a smaller wing or control surface sits ahead of the main wing on an aircraft or weapon. The name can apply to the whole aircraft, the layout, or just that forward surface. Guided missiles and smart bombs also make heavy use of canard wings. The term originated with the 1906 Santos-Dumont 14-bis, whose appearance in flight reminded observers of a duck stretching its neck.
The Wright Flyer of 1903, the first powered airplane, used a canard surface. Yet after that, few canard aircraft were built in significant numbers until the Saab Viggen jet fighter appeared in 1967. The aerodynamics of canards are complex and demand careful study.
Instead of the conventional tailplane found on most planes, designers might choose a canard to reduce the load on the main wing, improve control of airflow over the main wing, or boost maneuverability—especially at high angles of attack or during a stall. Canard foreplanes, whether in a pure canard or three-surface setup, significantly affect an aircraft's longitudinal balance, static stability, and dynamic stability.
**History**
**Early Use and Overview** Between the Wright Flyer and the Saab Viggen, canards were largely overlooked. Early examples had stability and control problems and were known for stalling dangerously. The Wright Brothers used a canard on the Flyer hoping it would make crashes safer: in a stall, they thought, the nose would drop, protecting the pilot. But this made the Flyer pitch-unstable. Because the design was novel, there was no proper design process, so canards were set aside for most of the early 20th century in favor of tail-aft layouts. More recent aerospace demands have revived interest, thanks to perceived gains in maneuverability, performance across a wide speed range, and new materials and technologies like fly-by-wire that make canards more practical.
**Pioneer Years** The Wrights began testing foreplane designs around 1900. Their first kite had a front surface for pitch control, and they used this layout on their first Flyer. They distrusted aft tails because Otto Lilienthal had died in a glider with one. They knew a foreplane would destabilize an airplane but saw it as a better control surface, and one the pilot could see in flight.
- First powered aeroplane with canard
- Wright Flyer, 1903
- First modern production canard jet
- Saab 37 Viggen, 1967
- First floatplane to fly with canard
- Fabre Hydravion, 1910
- First soviet canard design
- Mikoyan-Gurevich MiG-8 Utka, 1945
- First canard homebuilt inspired by vigge
- VariViggen, 1972
Lore & Background
The Wright Brothers began experimenting with the foreplane configuration around 1900, adopting it for their first Flyer. They were suspicious of the aft tail because Otto Lilienthal had been killed in a glider with one. They realized a foreplane would destabilize an aeroplane but expected it to be a better control surface. Many pioneers initially followed the Wrights' lead, including Santos-Dumont with his 14-bis of 1906 and the Fabre Hydravion of 1910. However, canard behavior was not properly understood, and other European pioneers such as Louis Blériot established the tailplane as the safer and more conventional design. After 1911, few canard types were produced for many decades.
Experiments continued sporadically. In 1917, de Bruyère constructed his C 1 biplane fighter with a canard foreplane, which was a failure. The Focke-Wulf F 19 'Ente' first flew in 1927 and was more successful. Immediately before and during World War II, experimental canard fighters such as the Ambrosini SS.4, Curtiss-Wright XP-55 Ascender, and Kyūshū J7W1 Shinden were flown, but no production aircraft were completed. In 1945, the Mikoyan-Gurevich MiG-8 Utka appeared as a test aircraft noted for docile slow-speed handling. The Saab 37 Viggen, first flown in 1967, became the first modern canard aircraft to enter production, spurring many later designs.
Reader's Guide
The canard configuration's significance lies in its ability to reduce main wing loading, better control main wing airflow, and increase manoeuvrability, especially at high angles of attack or during a stall. However, its aerodynamics are complex and require careful analysis. Early canards faced issues with stability and control, and were notorious for stalling, leading to their shelving in favor of tail-aft configurations for the first half of the 20th century. The revival began with the Saab 37 Viggen, which demonstrated that the drawbacks of canards could be compensated for, enabling excellent performance and agility. This set a precedent for later fighters such as the Eurofighter Typhoon and Dassault Rafale. The Viggen also inspired Burt Rutan's homebuilt canard designs, including the VariViggen, VariEze, and Long-EZ, which spread to the executive market in types such as the OMAC Laser 300, Avtek 400, and Beech Starship. The development of fly-by-wire and artificial stability in the 1980s was crucial, as canard configurations demanded careful control law tuning to balance responsiveness and pilot workload. Static canard designs can have complex interactions in airflow between the canard and main wing, leading to issues with stability and stall behavior, which limits their applicability.
Did You Know?
- The term 'canard' arose from the Santos-Dumont 14-bis of 1906, which was said to resemble a duck with its neck stretched out in flight.
- The Wright Flyer of 1903, the first powered aeroplane, used a canard surface.
- The Mikoyan-Gurevich MiG-8 Utka, first flown in 1945, was the first canard designed and flown in the Soviet Union.
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