Sidewash Angle For Given Moment Produced By Vertical Tail Calculator

Formula Used:

\[ \sigma = \frac{N_v}{l_v \cdot C_v \cdot Q_v \cdot S_v} - \beta \]

Vertical Tail Moment (Nv):

N·m

Vertical Tail Moment Arm (lv):

Vertical Tail Lift Curve Slope (Cv):

1/rad

Vertical Tail Dynamic Pressure (Qv):

Vertical Tail Area (Sv):

m²

Sideslip Angle (β):

rad

Sidewash Angle (σ):

Unit Converter ▲

Unit Converter ▼

From:	To:

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. This angle affects the aerodynamic performance and stability of aircraft.

2. How Does the Calculator Work?

The calculator uses the following formula:

\[ \sigma = \frac{N_v}{l_v \cdot C_v \cdot Q_v \cdot S_v} - \beta \]

Where:

\( \sigma \) — Sidewash Angle (rad)
\( N_v \) — Vertical Tail Moment (N·m)
\( l_v \) — Vertical Tail Moment Arm (m)
\( C_v \) — Vertical Tail Lift Curve Slope (1/rad)
\( Q_v \) — Vertical Tail Dynamic Pressure (Pa)
\( S_v \) — Vertical Tail Area (m²)
\( \beta \) — Sideslip Angle (rad)

Explanation: The formula calculates the sidewash angle based on the moment produced by the vertical tail and various aerodynamic parameters.

3. Importance of Sidewash Angle Calculation

Details: Accurate calculation of sidewash angle is crucial for aircraft stability analysis, control surface 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 within reasonable physical limits for accurate results.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between sidewash and downwash?
A: Sidewash refers to the lateral distortion of airflow around an aircraft, while downwash refers to the downward deflection of airflow behind wings.

Q2: How does sidewash affect aircraft stability?
A: Sidewash affects the directional stability of an aircraft by influencing the effectiveness of the vertical tail surface.

Q3: What factors influence sidewash angle?
A: Wing geometry, fuselage shape, aircraft configuration, and flight conditions all influence the sidewash angle.

Q4: When is sidewash angle most significant?
A: Sidewash effects are most pronounced during sideslip maneuvers and crosswind conditions.

Q5: How is sidewash angle measured experimentally?
A: Sidewash angle can be measured using flow visualization techniques, pressure measurements, or wind tunnel testing with appropriate instrumentation.