Calculate the turning radius of the taxiway for an airport serving large subsonic jet planes. The design speed of turning is 60 kmph and assume friction coefficient between tyre and pavement surface as 0.15.
192 m.
Taxiway Turning Radius Calculation for Airport Design
The calculation of the turning radius for an airport taxiway is a crucial aspect of airport engineering design, ensuring the safe and efficient movement of aircraft, especially large subsonic jet planes. The turning radius depends primarily on the design speed of the aircraft during turning maneuvers and the friction coefficient between the aircraft's tires and the pavement surface.
Given Parameters for Turning Radius
- Design speed of turning (\(V\)): \(60 \text{ kmph}\)
- Friction coefficient between tyre and pavement surface (\(f\)): \(0.15\)
Understanding Turning Radius Formula
For calculating the minimum turning radius (\(R\)) of a vehicle or aircraft on a horizontal curve, the centrifugal force is balanced by the frictional force. The general formula relating speed, friction, and radius is given by:
\(R = \frac{V^2}{C \cdot f}\)
Where:
- \(R\) is the turning radius in meters.
- \(V\) is the design speed in kilometers per hour (kmph).
- \(f\) is the friction coefficient.
- \(C\) is a constant that incorporates the acceleration due to gravity and unit conversions, ensuring the result is in meters when speed is in kmph. For airport taxiway design calculations, a commonly used constant that yields results consistent with practical design standards is \(C = 125\).
Step-by-Step Calculation of Turning Radius
Let us substitute the given values into the formula to find the turning radius:
-
Substitute the values into the formula:
\(R = \frac{(60)^2}{125 \times 0.15}\)
-
Calculate the square of the design speed:
\(V^2 = (60)^2 = 3600 \text{ kmph}^2\)
-
Calculate the denominator:
\(125 \times 0.15 = 18.75\)
-
Perform the division to find the turning radius:
\(R = \frac{3600}{18.75}\)
\(R = 192 \text{ m}\)
Final Turning Radius for Taxiway
Based on the design speed of \(60 \text{ kmph}\) and a friction coefficient of \(0.15\), the calculated turning radius for the taxiway serving large subsonic jet planes is \(192 \text{ m}\). This radius ensures safe and comfortable turning maneuvers for the aircraft on the ground.
Important Questions from Design of Airports
For the hottest month of the year at the proposed airport site, the monthly mean of the average daily temperature is 390C. The monthly of the maximum daily temperature is 480C for the same month of the year. From the given information, the calculated Airport Reference Temperature (in 0C), is
A runway is being constructed in a new airport as per the International Civil Aviation Organization (ICAO) recommendations. The elevation and the airport reference temperature of the airport are 535 m above the mean sea level and 22.65°C, respectively. Consider the effective gradient of runway as 1%. The length of runway required for a design-aircraft under the standard condition is 2000 m. Within the framework of applying sequential corrections as per the ICAO recommendations, the length of runway corrected for the temperature is
What is the airport reference temperature, if the monthly mean of average daily temperature for the hottest month of a study year = 24°C and the monthly mean of the maximum daily temperature for the same month of the same year = 30°C
The longitudinal sections of a runway have gradients as shown in the table.
End to end for sections of runway (m) Gradient (%) 0 to 200 +1.0 200 to 600 -1.0 600 to 1200 +0.8 1200 to 1600 +0.2 1600 to 2000 -0.5 Consider the reduced level (RL) at the starting point of the runway as 100 m.
The effective gradient of the runway is- As per the International Civil Aviation Organization (ICAO), the basic runway length is increased by x (%) for every y (m) raise in elevation from the Mean Sea Level (MSL). The values of x and y, respectively, are
