Landing Performance Characteristics Calculation

by admin in , , on April 16, 2019

This GUI program calculates all the required Landing flight performance characteristics for Jet-Engine Aircrafts, the performance characteristics (Outputs) includes:

  • Total Take Off Distance
  • Total Take Off Time
  • Ground Run Distance
  • Ground Run Time
  • Flare Distance
  • Flare Time
  • Airborne Distance
  • Airborne Time
  • Airborne Speed VA
  • Decent Angle
  • Chart presents all the past characteristics

Required Inputs are:

To run the program you need to insert the following values:

  • Obstacle Height (11.5 m as FAR standard, 15 m as UK standard)
  • Reference Area
  • Airplane Weight
  • Engine Thrust
  • Zero-Lift Drag Coefficient CDo
  • K: constant of CL^2 in the drag polar equation (CD = CDO + K*CL^2)
  • Maximum Lift Coefficient
  • Friction Coefficient [0.02 – 0.05]

The code based on Pamadi[1] and Saarlas[2] equations of performance of jet engine aircraft in cruise flight.

Example you can try with this program:

A jet-engine airplane weighs 40 KN and has a reference area S of 29 m2. The drag polar is given by CD = 0.009 + 0.06CL^2, CLmax = 2.05, and the engine thrust T = 20,900 N, friction Coefficient 0.05. Use obstacle height of 15 m.

Used Terms:

  • L: Lift
  • D: Drag
  • CD0: Zero-Lift Drag Coefficient
  • K: Weight of CL^2 in Drag Polar (CD = CD0 + K*CL^2)
  • CL: Lift Coefficient
  • VA: Approaching Speed (1.3 Vstall)
  • Vstall: the Flight Velocity calculated with respect to CLmax
  • Mu: Friction Coefficient between the ground and airplane wheels.

Program Interface:

The Program has one interface where you need to inter 8 requirements of the studied airplane and you will get 8 results, there are a chart you can present it by clicking on the button ‘Show Chart’ this chart explains the parameters you are going to find.



  1. If some results are negatives then there are an error in your inputs. The program has been tested on various ranges of airplanes characteristics and the results were accepted and logical.



[1] Bandu N. Pamadi, Performance, Stability, Dynamics, and Control of Airplanes, Second Edition,  at NASA Langley Research Center, Hampton, Virginia.

[2] Maido Saarlas, Aircraft Performance, Department of Aeronautics Engineering at U.S. Naval Academy.


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Release Information

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  • Released

    April 16, 2019

  • Last Updated

    May 29, 2019

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