Stabilizer (aeronautics)

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A stabilizer is a tail‑mounted aerodynamic surface that helps an aircraft stay stable and controllable in pitch (nose up or down) and, in some designs, yaw (nose left or right). It can be fixed or movable, and a fully movable tail is called a stabilator. If the tail has a separate elevator, it’s a tailplane with an elevator; the vertical stabilizer (fin) provides yaw stability and usually carries the rudder.

The horizontal stabilizer keeps the aircraft trimmed in flight by producing a balancing force about the center of gravity. Its lift or downward force depends on flight conditions, including speed, center of gravity, and flap position. The elevator on the tail changes pitch, while trim tabs help reduce pilot effort. Some light aircraft use a stabilator (all-moving tail) instead of a separate elevator.

Other designs include canards, which place a foreplane in front of the main wing; tailless aircraft that rely on wing design for stability; and V‑tails, which combine vertical and horizontal functions in two surfaces. Three-surface aircraft add a foreplane to the front in addition to the tail. Stability and control can also be achieved with electronic flight control that uses surfaces along the airframe as stabilizers.

Common tail layouts:
- Conventional tail: horizontal stabilizer with a vertical fin and separate elevator
- T-tail: horizontal stabilizer mounted high on the vertical fin
- Cruciform tail: a cross-shaped arrangement
- Twin-tail: two vertical fins
- Twin-boom tail: tail surfaces mounted on separate structures
- Stabilator: entire tail moves as a single control surface
- Canard arrangement: a foreplane provides lift ahead of the main wing
- V-tail: two surfaces form both vertical and horizontal control
- Tailless aircraft: no separate horizontal stabilizer; stability comes from wing design

Some aircraft also use drag-based or other control strategies for yaw, and the exact interaction between wing and tail is complex and often analyzed with air‑flow theory and testing.