How lift is generated
Forward motion creates a relative wind over the fixed wings. The wing's shape and angle direct this airflow to produce a pressure difference — lower pressure above, higher below — generating lift perpendicular to the relative wind. The faster the aircraft moves, the more lift the wing can produce at a given angle of attack.
Because lift depends on airspeed, the aircraft must maintain speed above its stall speed at all times in flight. Below this speed, the wing cannot generate sufficient lift to support the aircraft's weight.
Quick reference
| Lift source | Fixed wings + forward airspeed |
| Minimum speed | Stall speed (varies with weight and configuration) |
| Can hover | No |
| Primary control | Ailerons, elevator, rudder |
| Examples | Cessna 172, Boeing 737, F-16, gliders, Airbus A350 |
Advantages over rotary-wing
Fixed-wing aircraft are significantly more aerodynamically efficient at cruise. Without the mechanical complexity of a rotating rotor and without the drag penalties of large spinning blades, they achieve far higher speeds and range for the same fuel burn. The tradeoff is the inability to hover or take off and land in confined areas without a runway.
Related terms
- Rotary-Wing — the alternative: spinning blades generate their own lift
- Stall — the limitation of needing airspeed to generate lift
- Control Surfaces — how fixed-wing aircraft are controlled