1. What is Sidewash Angle?

Sidewash Angle is caused by the flow field distortion due to the wings and fuselage. It is analogous to the downwash angle for the horizontal tailplane and affects the aerodynamic performance of the vertical tail.

2. How Does the Calculator Work?

The calculator uses the Sidewash Angle formula:

Where:

• \( \sigma \) — Sidewash Angle (rad)
• \( C_n \) — Yawing Moment Coefficient
• \( V_v \) — Vertical Tail Volume Ratio
• \( \eta_v \) — Vertical Tail Efficiency
• \( C_v \) — Vertical Tail Lift Curve Slope (1/rad)
• \( \beta \) — Sideslip Angle (rad)

Explanation: This formula calculates the sidewash angle based on the yawing moment coefficient, vertical tail characteristics, and sideslip angle.

3. Importance of Sidewash Angle Calculation

Details: Accurate sidewash angle calculation is crucial for aircraft stability analysis, vertical tail design, and predicting aircraft behavior during sideslip conditions.

4. Using the Calculator

Tips: Enter all required parameters with appropriate units. Ensure all values are positive and valid for accurate calculation results.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical range of sidewash angles?
A: Sidewash angles typically range from 0 to 15 degrees, depending on aircraft configuration and flight conditions.

Q2: How does sidewash affect aircraft stability?
A: Sidewash affects the effectiveness of the vertical tail and influences directional stability and control characteristics.

Q3: Can sidewash angle be negative?
A: Yes, sidewash angle can be negative in certain flight conditions, indicating flow direction opposite to typical patterns.

Q4: What factors influence sidewash angle?
A: Wing geometry, fuselage shape, vertical tail position, and flight conditions all influence the sidewash angle.

Q5: How is sidewash angle measured experimentally?
A: Sidewash angle is typically measured using flow visualization techniques or pressure measurements in wind tunnel testing.