Calculating Cruise Flight Performance of Jet-Engine Aircrafts V2.0

This is the second version of ‘Flight Cruise Performance Calculator for Jet Aircraft’ and also is about a GUI program that calculates Range and Endurance (Flight-Time):

Range for Fixed Altitude
Range for Fixed Velocity
Flight-Velocity that force Fixed-Altitude-Range
Flight-Velocity that force Fixed-Velocity-Range
Endurance (Flight Time)

in addition to the other cruise flight performance in the past version, includes:

Maximum Level Flight Speed
Minimum Level Flight Speed
Stall Speed
Speed Corresponding to Minimum Drag
Maximum Lift to Drag Ratio
Absolute Ceiling (Maximum Flight Hight corresponding to Minimum Drag)
Chart presents: Induced Drag, Zero-Lift Drag, Total Drag and position of Vmin, Vmax and VDmin.

Required Inputs:

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

Flight Altitude
Reference Area
Airplane Weight
Fuel Weight
Fuel Consumption
Engine Thrust
Zero-Lift Drag Coefficient CDo
K constant of CL^2 in the drag polar equation
Maximum Lift Coefficient.

The program gives you the maximum hight, Velocity, Range and Endurance of a given airplane characteristics and the minimum required thrust for this altitude. The code based on Pamadi[1] and Saarlas[2] equations of performance of jet engine aircraft in cruise flight.

Examples you can try with this program:

A jet-engine airplane weighs 45000 N, hold fuels 10000 N, and has a reference area S of 31 m2. The drag polar is given by CD = 0.014 + 0.038CL^2, CLmax = 1.5, and the engine thrust T = 20,000 N, and Engine Specific Fuel Consumption 30 N/N/H. Determine the maximum and minimum speeds in level flight at sea level and at an altitude of 9000 m. What is the absolute ceiling of this airplane?

Used Terms:

L: Lift
D: Drag
Em: Maximum E(L/D)
CD0: Zero-Lift Drag Coefficient
K: Weight of CL^2 in Drag Polar (CD = CD0 + K*CL^2)
c: Specific Fuel Consumption

Program Interface:

References:

[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.