Aircraft Performance Program (APP) Software
Aircraft Performance Program APP Logo

Aircraft Design Software

Aircraft Performance Program (APP) was created in 1981 by ALR Aerospace, in association with RUAG Aerospace Defense Technology, as a unique aircraft performance and preliminary design analysis program to aid in the conceptual and preliminary design of fighters, trainers and light aircraft. Today, APP is a trusted aircraft performance analysis tool, unlike anything available in the industry today. DARcorporation is proud to be the only distributor of ALR’s Aircraft Performance Program software and strongly recommend this widely used program for aircraft performance calculations.

Aircraft Performance Program (APP) is a specialized software for aircraft performance analysis. APP computes the complete range of aircraft performance parameters over a user-specified range of altitudes, speeds and other variables. The software is designed for speed, simplicity and flexibility in its use. It provides users with useful quick-look (evaluate) functions for the examination of a wide variety of data e.g. thrust, fuel flow, lift, drag, SEP, turn rate, etc.

APP is recommended for commercial aerospace & engineering companies, government offices and aeronautical engineering universities. APP is the perfect solution for:

  • Practical and theoretical performance analysis
  • Concept development and detail design
  • Competitor performance analysis
  • Flight test and Certification support
  • Flight handbooks, Performance and Marketing brochures
  • University teaching and instruction
Aircraft Performance Program APP-Features

Suitable for Commercial, Civil & Military Aircraft, Turboprops, Gliders, Trainers, Business Jets & UAVs


Download APP Brochure

Aircraft Performance Program Features

Available Flight Segments

APP provides you with a multitude of flight segments that allow you to define specific mission analyses. It enables both, a very fast and easy “first shot” solution up to very detailed missions for complex analyses! A selection of available segments includes:

  • Acceleration
  • Climb; Climb at Best Angle; Climb at Best Rate; Climb at CAS; Climb at EAS; Climb at Constant Mach
  • Cruise; Cruise at Best SR; Cruise at Mach; Cruise at Optimum Altitude and Mach
  • Deceleration
  • Descent, Descent at No Credit (at best FF or best SR), Descent at CAS, Descent at EAS, Descent at Mach
  • Energy Exchange
  • Ground Operation
  • Landing Roll
  • Loiter & Loiter at Best FF
  • Maneuver at Constant or Maximum Load Factor
  • Refuel
  • Reset Altitude or Reset Mach
  • Store Drop
  • Take-off

Available Mission Optimizers

The mission module includes a set of fast optimizers to help you refine your analyses. Using the mission-optimizers, APP users are able to define segments that shall be maximized along with inputs on required reserves. Available optimizations are:

  • Range Optimization
  • Endurance Optimization
  • Radius of Action optimization

Point Performance

APP features a multitude of standard performance charts for aircraft point performance analysis. Furthermore a comparison feature for different results is readily available. Available Pre-defined point performance-analysis charts are highly customizable, they include:

  • SEP-Envelopes
  • G-Envelopes
  • Turn-Rate Charts (constant SEP) / Energy-Maneuverability Charts
  • Turn-Rate Charts (constant Altitude)
  • SEP vs. Altitude Charts
  • Point Performance Parameter Computation
  • Required Thrust and Drag Chart for Different Load-Factors

Take-Off & Landing Computation

APP incorporates a unique 2.5-dimensional method to obtain takeoff- and landing- distances with respect to different certifications and environmental conditions:

  • Takeoff, Rejected Takeoff, Balanced Field Length, Landing
  • Calculations respect military and civil airworthiness regulations: MIL-STD-3013, FAR Part 23 & 25, EASA CS 23 & 25
  • All Engines Operative (AEO) and One Engine Inoperative (OEI) calculations
  • Respecting runway dimensions as: Runway Length, Runway Altitude, Runway Slope
  • Different runway conditions are available: Dry, Wet, Snow, Ice

Calculations possible with or without afterburner

Where can I find the APP Example Files?

The APP example files are found in the My Documents folder of the user that installed APP on your computer.  If APP was installed with administrator rights, it can happen that the files are installed in the My Documents folder of the administrator user account.  If you do not have access to the example files folder, please contact us and we can provide you with the example files.

Can different engine data be used for various mission segments?

Yes, each different engine data will require a new aircraft configuration setup. For each mission segment, select the corresponding aircraft configuration for the appropriate engine model.

Can temperature be set independent of altitude for different mission segments?

Yes, temperature above or below International Standard Atmosphere (ISA) can be added to any segments of flight in the mission.

APP Benefits

Tested & Verified Commercial Software Product


More than 60 output parameters are available for performance and mission evaluation. The output format can be changed without re-computation. Charts and spreadsheets may be copied directly into any Microsoft document or saved to file. For increased flexibility, the spreadsheets are compatible with MS Excel file format.


Aircraft Performance Program (APP) enables obstacle-free integration into existing working procedures. Existing in-house tools, procedures and methods may be kept to create APP models and the desired analyses.


Aircraft Performance Program (APP) is a valuable tool for small design teams and large aerospace companies. APP will produce quick assessments without having to resort to internal, and very expensive, computer programs. Operators, research establishments, universities, government agencies and air forces will use it as a very cost-effective tool by avoiding expensive and lengthy subcontracting in many phases of their work.

Support Documents & Downloads

Software License Pricing

Software purchase includes CD-ROM, WibuKey and 12 months software maintenance (tech support, service releases and new version upgrades). Educational & multiple license discounts.


Software Licensing

DARcorporation uses Wibu-Systems WibuKey copy protection for the software licensing. The WibuKey concept consists of a WibuBox and the Wibu software. The WibuBox or WibuKey refers to the USB dongle that contains the software license. Our software needs the license to be present so that it will run. The Wibu software (or drivers) refers to the Wibu program that must be installed so that the computer can recognize WibuBoxes.

If a virtual server is intended to host the license, a USB-over-IP solution (such as AnywhereUSB hub by Digi that has been tested to work) will be required to plug in the WibuKey USB dongle and controlled by the virtual server on the same network.

FLOATING LICENSE: Software is accessible from multiple computers, but limited to the number of licenses purchased. The WibuKey does not need to be attached to the local computer where the software is started. All computers running APP must be able to access the license server.

NODE LOCKED LICENSE: Software can only be used on the computer the software is installed on. The WibuKey must be attached to the local computer where APP is started.

System Requirements

An Intel or compatible CPU
OS: Windows (64 bit) 7 and up
Minimum RAM: 64 MB of extended memory to run APP smoothly
Minimum Free Hard Disk Space: 20 MB

Example Files For Download

Aircraft, mission computation and/or point performance chart files to be used in APP

  • Airbus 320 twin-engine narrow-body airliner (zip file)
  • Boeing 747 four-engine wide-body airliner (zip file)
  • Dornier Do228 hybrid-electric airliner (zip file)
  • Generic light single engine piston aircraft (zip file)
  • Generic light-weight Fighter (zip file)
  • Generic small hybrid-electric UAV (zip file)
  • Generic small UAV (zip file)
Contact Us for software-related technical support
DARcorp LOGO white
  • 910 E 29th St, Lawrence, Kansas 66046-4926, USA