Tailplane

A tailplane, also known as a horizontal stabilizer, is a small lifting surface located on the tail (empennage) behind the main lifting surfaces of a fixed-wing aircraft. It plays an important role in keeping airplanes steady and controllable during flight. The tailplane is found on many airplanes, but not all aircraft have one. For example, canards, tailless and flying wing aircraft do not use a separate tailplane, and V-tail aircraft combine the tailplane with other control surfaces into a V-shaped design.

The main job of the tailplane is to provide stability and help the pilot control the airplane’s pitch, which is the up-and-down movement of the nose. It does this by adjusting for changes such as shifts in the centre of pressure or centre of gravity. These shifts can happen when the airplane speeds up or slows down, burns fuel, or carries different loads like passengers or cargo.

Even though most airplanes have a tailplane, other types of aircraft, such as gyroplanes and some helicopters, also use horizontal stabilizers as part of their tail assembly. These surfaces help keep these aircraft steady, just like they do for regular airplanes. The tailplane is a key part of making sure aircraft fly safely and can be controlled well by pilots.

Tailplane types

The tailplane is the part of an airplane at the back that helps it fly straight. It includes a fixed piece called the stabiliser and a movable piece called the elevator. Tailplanes can be placed in different positions on the airplane, such as high up, in the middle, or low down.

Some special names are used for certain positions. For example, a cruciform tailplane is placed in the middle of the vertical fin, like on the Hawker Sea Hawk and Sud Aviation Caravelle. A T-tail is mounted high up on the fin, as seen on the Gloster Javelin and Boeing 727.

Stability

A wing on its own can make an airplane unstable. When something, like a strong wind, lifts the nose of the plane, it can make the nose go up even more. But a tailplane, which is a small wing at the back of the plane, helps push the nose back down. This helps keep the plane steady in the air, just like how a weather vane always points into the wind.

The tailplane also helps smooth out movements when the pilot isn't controlling the plane. It does this by creating forces that slow down any shaking or wobbling. Depending on the plane and how it's flying, the tailplane can push up, push down, or stay balanced. Some older planes had tailplanes that pushed up, which could make them harder to fly. But later planes were designed to keep things more stable.

Control

A tailplane helps a pilot control the aircraft's up-and-down movement, known as pitch. Usually, the tailplane has a part called an elevator that moves to adjust lift and keep the aircraft steady.

Some faster aircraft use a different design called a stabilator or all-moving tailplane. This is needed when flying at very high speeds to prevent problems and keep the plane controllable.