Wing loading is the ratio of an aircraft’s weight to its wing planform area, expressed in kg/m² or lb/ft². It is the single number that most directly determines an aircraft’s flight characteristics: stall speed, turn radius, gust response, takeoff and landing distance, and cruise efficiency all follow from it.
Wing loading varies enormously across the UAV spectrum:
| Platform class | Typical wing loading (kg/m²) | Notes |
|---|---|---|
| Hand-launched micro UAV | 3–10 | Must be hand-throwable; very low stall speed |
| Small multirotor (disc loading) | 25–75 | Disc loading, not wing loading; governs hover efficiency |
| Tactical fixed-wing (ScanEagle) | 15–30 | Optimized for loiter endurance |
| Expendable strike (Shahed-class) | 50–100 | Optimized for cruise speed and structural simplicity |
| MALE (MQ-9 Reaper) | 100–200 | Balance of endurance and payload capacity |
| HALE (RQ-4 Global Hawk) | 200–350 | High altitude requires large wing area relative to weight |
| Crewed fighter | 300–500 | High wing loading for speed and maneuverability |
Higher wing loading means faster cruise, less sensitivity to gusts, and smaller wing area (cheaper, simpler structure) — but also higher stall speed, longer takeoff distance, and worse loiter performance. The choice is driven by mission: a long-endurance surveillance platform wants low wing loading; an expendable strike drone launched by catapult wants high wing loading.
Related terms
- Aspect Ratio — the other primary geometric parameter governing wing performance
- Lift — the force that wing loading defines the requirement for
- Stall — the minimum-speed condition directly determined by wing loading