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PreSTo - Aircraft Preliminary Sizing Tool

Introduction to PreSTo

Aircraft Design Spreadsheet Calculation

Aim of PreSTo is to provide the aircraft design calculation scheme from lecture and short course of Prof. Scholz as spread sheet. The spread sheet will ultimately include these modules:
  1. Sizing (PreSTo-Classic) (See: lecture)
  2. Cabin and Fuselage Layout (PreSTo-Cabin)
  3. Wing Layout
  4. Design for High Lift
  5. Empennage Layout I and II
  6. Mass and CG Estimation
  7. Landing Gear Layout
  8. Drag Estimation
  9. DOC Calculation
  10. Results, Visualization: 3D and 3-view (PreSTo-Vis), Interfaces to other Tools
We are working internally quite a bit with PreSTo, but we are a little slow to put things online, because this requires a much more user-friendly appearance of the tool. But we will get there, it's all a matter of time and/or money.

Excel was selected as spread sheet for programming of PreSTo. PreSTo works with separate modules that are connected via a small project file. The project file contains a control center and a database which stores user input data for one design. The project file links between the modules that are located each in one Excel file. The modules take input data from the project file run the design/analysis and output data back to the project file with its database. PreSTo has grown to a size that a full design is described by about 500 aircraft parameters.



Philosophy of PreSTo is to support the aircraft designer to convert mission requirements into aircraft parameters. In order to do this, PreSTo supplies:


Man Power and Finances

PreSTo was started as part of the research project Green Freighter with Kolja Seeckt. Since then it grew mainly based on project work from students supervised by Prof. Scholz. One student at a time is responsible to maintain the code and structure programming among all participating students: Hamburg University of Applied Sciences supports the work as an internal research project.

PreSTo is the basis of OPerA (Design Optimization of Jets) and PrOPerA (Design Optimization of Props).

logoBishop.gif Bishop GmbH has supported the development of PreSTo-Cabin by financing and tutoring Philippe Montarnal during an internship.


PreSTo Modules

PreSTo-Sizing = PreSTo-Classic

Module 1: Sizing. A spreadsheet for aircraft preliminary sizing was started 10 years ago. The original spreadsheet for sizing of jets certified based on CS-25 or FAR Part 25 was written in German. An English version for jets and an English version for sizing of propeller driven aircraft was developed later. The spreadsheets for jets are in use in each aircraft design lecture and short course at our university. More than 1000 students have worked with this tool already. It is available as A-C_Preliminary_Sizing.xls. For backward compatibility we will leave this tool in its old "look and feel" we like it and we are used to it.



Module 2: Cabin and Fuselage Layout supports the sizing and the interactive step-by-step design of the cabin in some detail. Based on cabin parameters, the fuselage general dimensions are found. PreSTo-Cabin is now available as "PreSTo-Cabin_1.0.xls":   new
*.xls PreSTo-Cabin_1.0.xls     Changed on:  17 January 2011,     Size:  2.9M
This file is set up for the Airbus A320.

Please make sure ...

*.xls PreSTo-Cabin_1.0_FairchildDornier728.xls     Changed on:  18 February 2011,     Size:  2.9M
This file is set up for the Fairchild Dornier 728. Cabin data extracted from:
*.jpg FairchildDornier728_3View_and_Cabin.jpg     Size:  963K

*.xls PreSTo-Cabin_1.0_A330.xls     Changed on:  22 April 2011,     Size:  2.9M
This file is set up for the Airbus A330. Compare cabin data from Airbus with the PreSTo layout:
*.jpg A330_CabinLayout.jpg     Size:  395K

Try out PreSTo-Cabin yourself. Your feedback is welcome!


PreSTo Documentation

*.pdf PreSTo-Cabin_Documentation_10-11-15.pdf     Changed on:  17 February 2011,     Size:  1.8M

item Further reports related to PreSTo

item Publications related to PreSTo

ILT item Presentation at Symposium "Kollaboration im Flugzeugentwurf" (Collaboration in Aircraft Design)

SCHOLZ, Dieter: Aircraft Preliminary Sizing Tools @ Aero : SAS => OPerA => PreSTo => further Tool Chain, (Kollaboration im Flugzeugentwurf - 1. CPACS/RCE Symposium, Deutsches Zentrum für Luft- und Raumfahrt, Hamburg, 15. / 16. March 2012). - Download:

*.pdf PreSTo_PRE_Kollaboration_12-03-15.pdf     Size:  2.2M

DGLR item Paper and Presentation at the German Aerospace Conference:

ABULAWI, Jutta; SEECKT, Kolja; POMMERS, Martins; SCHOLZ, Dieter: Automatic Generation of 3D-CAD Models to Bridge the Gap between Aircraft Preliminary Sizing and Geometric Design. In: DGLR: Deutscher Luft- und Raumfahrtkongress 2011 : Tagungsband - Manuskripte (DLRK, Bremen, 27. - 29. September 2011), pp 405-415. - ISBN: 978-3-932182-74-X. DocumentID: 241195. Download:

*.pdf PreSTo_PUB_DLRK_11-09-27.pdf     Size:  519K

ABULAWI, Jutta: Automatic Generation of 3D-CAD Models to Bridge the Gap between Aircraft Preliminary Sizing and Geometric Design. Presentation. Deutscher Luft- und Raumfahrtkongress 2011, Bremen, 27. - 29. September 2011. - Download:

*.pdf PreSTo_PRE_DLRK_11-09-27.pdf     Size:  2.1M

EWADE item Presentation at the European Workshop on Aircraft Design Education:

SCHOLZ, Dieter: PreSTo-Aircraft Preliminary Sizing Tool - From Requirements to the Three-View-Drawing. In: DE MARCO, Agostino; NICOLOSI, Fabrizio (Ed.): Proceedings of 10th EWADE Conference (10th European Workshop on Aircraft Design Education, University of Naples "Federico II", Italy, 24. - 27. May 2011 ). - ISBN 978-88-906484-1-0. Download:

*.pdf PreSTo_PRE_EWADE_11-05-25.pdf     Size:  2.7M

DGLR item Paper and Presentation at the German Aerospace Conference:

SEECKT, Kolja; SCHOLZ, Dieter: Application of the Aircraft Preliminary Sizing Tool PreSTo to Kerosene and Liquid Hydrogen Fueled Regional Freighter Aircraft. In: DGLR: Deutscher Luft- und Raumfahrtkongress 2010 : Tagungsband - Ausgewählte Manuskripte (DLRK, Hamburg, 31. August - 02. September 2010). - ISBN: 978-3-932182-67-7. DocumentID: 161161. Download:

*.pdf PreSTo_PUB_DLRK_10-08-31.pdf     Size:  590K

More information on PreSTo - especially on its (planned) interfaces to other tools and 3D visualization you can find on the German Page.
STAND:  26 August 2014
AUTHOR:  Prof. Dr. Scholz
home  Prof. Dr. Scholz
home  Aircraft Design and Systems Group (AERO)
home  Aeronautical Engineering   deutsch
home  Department of Automotive and Aeronautical Engineering  deutsch
home  Faculty of Engineering and Computer Science
home  Hamburg University of Applied Sciences