免费展弦比计算器
计算机翼的展弦比(翼展²/翼面积)。
Aspect Ratio (AR)
10.208
Aspect Ratio (AR) vs Wingspan (b)
公式
## Wing Aspect Ratio Aspect ratio (AR) measures how slender a wing is. It is defined as the square of the wingspan divided by the wing planform area, or equivalently, the wingspan divided by the mean chord. ### Formula **AR = b² / S** High aspect ratio wings (like gliders, AR > 15) have low induced drag and are efficient for slow, soaring flight. Low aspect ratio wings (like fighters, AR < 5) are better for high-speed maneuverability and structural strength.
计算示例
A transport aircraft with a 35 m wingspan and 120 m² wing area.
- 01AR = 35² / 120 = 1225 / 120
- 02AR = 10.208
- 03Mean chord = 120 / 35 = 3.429 m
常见问题
What are typical aspect ratios for different aircraft?
Sailplanes: 20-40, commercial jets: 7-12, fighters: 2-5, delta wings: 1.5-3. Higher AR reduces induced drag but increases wing bending loads and weight.
Why do gliders have high aspect ratios?
Gliders need to minimize drag to maximize glide ratio. Since induced drag is inversely proportional to aspect ratio, slender wings dramatically reduce the drag penalty of generating lift at low speeds.
How does aspect ratio affect induced drag?
Induced drag coefficient CDi = CL² / (pi × e × AR), where e is the Oswald efficiency factor. Doubling the aspect ratio halves the induced drag for the same lift coefficient.
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