1. What is Radius of Fillet Calculator?

Definition: This calculator determines the appropriate fillet radius for taxiway design based on aircraft undercarriage characteristics and safety margins.

Purpose: It helps airport engineers design safe taxiway fillets that accommodate aircraft turning movements while maintaining adequate clearance.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( r \) — Radius of fillet (meters)
• \( R \) — Radius of taxiway centerline (meters)
• \( \gamma \) — Deviation of main undercarriage (meters)
• \( M \) — Minimum safety margin (meters)
• \( T \) — Track of main undercarriage (meters)

Explanation: The formula calculates the maximum safe fillet radius by accounting for aircraft dimensions and required safety clearances.

3. Importance of Fillet Radius Calculation

Details: Proper fillet radius ensures aircraft can navigate turns safely without undercarriage overruns, reduces pavement stress, and improves operational efficiency.

4. Using the Calculator

Tips: Enter all dimensions in meters. The ±5% indicates typical measurement tolerances. All values must be ≥ 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a taxiway fillet?
A: A fillet is a curved transition area added at taxiway intersections to provide adequate clearance for aircraft maneuvering.

Q2: Why is safety margin important?
A: The safety margin accounts for pilot variability, aircraft dynamics, and unexpected conditions during taxi operations.

Q3: How is undercarriage deviation determined?
A: Deviation is measured as the maximum lateral offset of the main gear from the centerline during turning maneuvers.

Q4: What affects the track measurement?
A: Track width varies by aircraft type and is the distance between the centerlines of the main undercarriage wheels.

Q5: Are there standard fillet radii?
A: While there are guidelines, each fillet should be calculated based on the specific aircraft using the taxiway.

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