1. What is Touchdown Velocity?

Touchdown Velocity is the instantaneous velocity of an aircraft when it touches the ground during landing. It is typically calculated as 1.3 times the stall velocity to ensure a safe margin above the minimum flying speed.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( V_T \) — Touchdown Velocity (m/s)
• \( V_{stall} \) — Stall Velocity (m/s)

Explanation: The 1.3 factor provides a safety margin above the stall speed to ensure stable and controlled landing conditions.

3. Importance of Touchdown Velocity Calculation

Details: Accurate touchdown velocity calculation is crucial for aircraft landing performance analysis, runway length requirements, and ensuring safe landing operations.

4. Using the Calculator

Tips: Enter stall velocity in m/s. The value must be valid (greater than 0).

5. Frequently Asked Questions (FAQ)

Q1: Why is touchdown velocity 1.3 times the stall velocity?
A: The 1.3 factor provides a safety margin to account for variations in approach speed, wind conditions, and pilot technique, ensuring stable approach and landing.

Q2: What is stall velocity?
A: Stall velocity is defined as the velocity of an airplane in steady flight at its maximum lift coefficient, representing the minimum speed at which the aircraft can maintain level flight.

Q3: Does this calculation apply to all aircraft types?
A: While the 1.3 factor is a general guideline, specific aircraft may have different recommended approach speed factors based on their design and operational requirements.

Q4: How does weight affect touchdown velocity?
A: Heavier aircraft have higher stall speeds, which consequently increases the required touchdown velocity to maintain the same safety margin.

Q5: Are there other factors that influence actual touchdown velocity?
A: Yes, factors such as wind conditions, aircraft configuration, pilot technique, and runway conditions can all affect the actual touchdown velocity.