SAS - Simple Aircraft Sizing
Aircraft Preliminary Sizing Spreadsheets
Aim of SAS is to provide the aircraft design calculation scheme from Chapter 5 (Preliminary Sizing) of the
of Prof. Scholz as spread sheets. The lecture only deals with aircraft design of transport aircraft and business jets
certified based on CS-25 or FAR Part 25. So, the modules helpful in relation to teaching are only those for
Jets and CS-25
However, it is also desirable to cover the whole field of aircraft with different propulsion systems and certification rules. This would consider
- SAS Classic: The tool used for more than a decade with more than 1000 students. See here.
- SAS Matching: By automatically adjusting the ratio V/Vmd , the location of the cruise line is optimized in the matching chart.
- SAS Optimization: An evolutionary optimization algorithm is fitted to SAS Matching.
Jets & Props and other Certification Rules
Selected spread sheets are currently available only on the traditional page of the lecture (as indicated).
Ultimately all modules will (hopefully) be included here (one day) in a systematic way.
- SAS Jet – CS-23
- SAS Prop – CS-25. See here.
- SAS Prop – CS-23
- SAS VLA
- SAS Ultra Light
Philosophy of SAS is to support the aircraft designer to convert mission requirements into a hand full of the most important aircraft parameters.
In order to do this, SAS supplies:
A spread sheet was selected for programming of SAS. The advantages are:
- An efficient well proven calculation sequence and its equations.
- Statistical parameters for landing field length, take-off field length, ... mission fuel fractions, ...
- The matching chart, showing how requirements interact and how the design point is chosen.
- Methods to help calculate the most fundamental parameters from almost no input: Oswald factor, maximum glide ratio, zero lift drag coefficient, minimum drag lift coefficient, specific fuel consumption, ...
SAS is only the first step in a tool chain in preliminary aircraft design. The sequence of tools that can be used is this:
- Efficient integration of input, calculation and output.
- Open and easy to understand programming.
- Easy to adapt to individual needs by the user.
further Tool Chain
Publications related to SAS
Presentation at Symposium "Kollaboration im Flugzeugentwurf" (Collaboration in Aircraft Design)
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: http://PreSTo.ProfScholz.de
Presentation and Paper at Conference "Recent Research and Design Progress in Aeronautical Engineering and its Influence on Education" (RRDPAE 2008)
SCHOLZ, Dieter; NIŢĂ, Mihaela:
Preliminary Sizing of Large Propeller Driven Aeroplanes.
(RRDPAE 2008, Czech Republic, Brno, 16-17 October 2008). Brno : Brno University of Technology, 2008. -
ISSN: 1425-2104, Volume 2008, Paper-Number: 61. CD from: http://lu.fme.vutbr.cz/rrdpae2008.
Download the presentation and the related journal publication here.
STAND: 02 May 2013
AUTHOR: Prof. Dr. Scholz
Prof. Dr. Scholz
Aircraft Design and Systems Group (AERO)
Department of Automotive and Aeronautical Engineering
Faculty of Engineering and Computer Science
Hamburg University of Applied Sciences