Minimum Safety Margin given Radius of Fillet Calculator

Minimum Safety Margin Formula:

\[ M = -(r - R + \gamma + \frac{T}{2}) \]

Radius of Fillet:

Radius of Taxiway Centerline:

Deviation of Main Undercarriage:

Track of Main Undercarriage:

Minimum Safety Margin:

1. What is Minimum Safety Margin given Radius of Fillet?

Definition: This calculator determines the minimum safety margin for aircraft taxiway operations based on fillet radius, taxiway centerline radius, undercarriage deviation, and track measurements.

Purpose: It helps airport engineers and planners ensure safe clearance margins for aircraft maneuvering on taxiways.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ M = -(r - R + \gamma + \frac{T}{2}) \]

Where:

\( M \) — Minimum Safety Margin
\( r \) — Radius of Fillet
\( R \) — Radius of Taxiway Centerline
\( \gamma \) — Deviation of Main Undercarriage
\( T \) — Track of Main Undercarriage

Explanation: The formula calculates the negative of the sum of fillet radius minus taxiway radius plus undercarriage deviation plus half the undercarriage track.

3. Importance of Safety Margin Calculation

Details: Proper safety margin estimation ensures aircraft can maneuver safely without risk of collision or going off the taxiway, accounting for all geometric factors.

4. Using the Calculator

Tips: Enter all required measurements. Values should be in consistent units (typically meters). All inputs have a ±5% tolerance.

5. Frequently Asked Questions (FAQ)

Q1: Why is the safety margin negative in the formula?
A: The negative sign accounts for the worst-case scenario in the geometric relationship between aircraft and taxiway dimensions.

Q2: What's a typical value for fillet radius?
A: Fillet radius varies by airport and aircraft type but typically ranges from 20-30 meters for large commercial aircraft.

Q3: How is undercarriage deviation measured?
A: This is the maximum observed lateral deviation of the main undercarriage from the centerline during taxiing.

Q4: What if my safety margin is too small?
A: A small or negative safety margin indicates potential clearance issues. Consider redesigning the taxiway geometry or restricting aircraft types.

Q5: Does this include safety factors for weather?
A: No, additional margins should be added for adverse weather conditions like snow or ice.