Whats new?

05.03.2019 - Version 4.0 released


NEW FEATURE: Propellers

  • Arbitrary number of propellers can be added to the model. Each propeller has a thrust vector which adds to the aircraft force balance and enables to study different propeller configurations, such as positions, mount angles, and thrust.
  • Additional result parameters related to propulsion, such as rate of climb, and pitch angle. 
  • Additional 3d plot entities: Center of gravity location, force balance, flight path angle, and horizontal reference

NEW FEATURE: Unit system

  • The systems of units can now be selected. Available systems are SI and Foot-pound-second (FPS). The system of units is saved with the model.


  • New formulation of penalties delivers much better results and helps the user to identify which constraints are violated. Also, the standard penalties have been changed and allow for a more straightforward application.
  • Improved optimization history plot showing the objective function including all penalties
  • Additional constraints are now available:  Pressure coefficient, geometry change rates, pitch angle, flight path angle, rate of climb, center of gravity location


  • Improved labels in 3d view
  • Bugfix in C_l_wet constraint. The lift coefficient of a strip does now take into account the full component of the force perpendicular to the onset flow, not only the part projected into the x-z-plane. Optimizations using this constraint now run much more robust and deliver better results.
  • Update of third-party libraries and the runtime environment for improved performance.
  • Improved exception handling


28.01.2019 - Version 3.11 released


NEW FEATURE: First propulsion parameters (Engines and Propeller feature to come soon)

  • Additional plots for required thrust and performance as function of airspeed at a given altitude for steady horizontal flight.
  • Thrust and performance parameters are accessible as objective functions, and constraints for optimization and parameter studies


  • Default penalty factors improved for different optimization constraints.

  • Increased resolution of carpet plots.

  • Default viscous drag coefficient changed to a more typical value, which can be used for most cases (at Reynolds numbers greater than 200 000)


 04.01.2019 - Version 3.10 released


NEW FEATURE: Model export to CAD

  • Allows easy geometry export to all major CAD systems, including CATIA, SolidWorks, NX and many more using the STL format.


  • Undo/Redo bug fixed


  • Additional constraints are available in the optimization. In particular, structural constraints on the root bending now enable the analysis of bell-shaped lift distributions and new configurations with proverse yaw.
  • Notification when updates are available
  • Updated libraries increase performance


18.11.2018 - Version 3.9 released



  • Additional licence types are available, now also including a Free licence.
  • Updated in-app links to tutorials, store, and downloads due to a new website structure
  • Bugfix in airfoil import dialog


  • Values of design variables are shown as real values, not normalized


09.11.2018 - Version 3.8 released

  • Additional User hints in case of inconsistent bounds of design variables
  • 2D pressure distribution plots include the y position of the current strip


03.11.2018 - Version 3.7 released


NEW FEATURE: Parameter studies feature

  • Enables automatic screening of parameters and the impact on specific results. For example,  this feature can be used to understand the change of the static margin due to a change of the sweep angle.
  • Parameters include real and integer values, including geometry, discretization, computation settings etc.
  • Internal checks make sure that the setup is consistent
  • An additional results node provides access to the screening results. This is also true for optimizations.
  • Multiple parameters can be screened at the same time


  • More objective functions available
  • Design variables now also include flap angles


  • Number of panels per strip need not be even but may also be odd.
  • Strip-wise refinement option BOTH added. This increases the panel density at both extremities of a strip.


  • Different options for the definition of a section's chord length.


  • Coordinates do not need to be normalized anymore.
  • The model can also be loaded when the required airfoil is not available in the airfoil catalog. In this case a dummy airfoil will be used (NACA0012)
  • The airfoil name is not case-sensitive in the xml file
  • Names may contain dots

User Settings:

  • Preferences dialog enables the definition of colors, sizes, arrow types etc.
  • User Settings are saved when closing the application and restored at the next start.


  • Freshwater and Seawater models load properly


  • Improved Error Handling allows to save the model before potential crash
  • Multi-threading accelerates start-up
  • White canvas background and larger font size
  • Improved result plots of strictly vertical wings (such as VTPs)
  • xml suffix removed from model name
  • Automatic logging of results in a text file
  • New aileron example accessible through the QuickStart menu
  • Additional checks and error messages when loading an xml file improve  debugging of manually created xml files


23.09.2018 - Version 3.6 released



  • Each airfoil provides an optional flap to easily model ailerons, elevons etc.


  • More robust error handling at start-up
  • Open File- dialog working properly when invoked multiple times
  • Anonymous bug reports can be sent


  • Improved modelling of vertical wings (such as VTPs)
  • New performance plot Lift/Drag as a function of speed and altitude


15.09.2018 - Version 3.5 released


Airfoil catalog:

  • Added over 1000 airfoils to the built-in airfoil catalog
  • Airfoil import feature allows easy import of multiple airfoil files at the same time.
  • All airfoils in the catalog are accessible for inspection through a node in the Model Tree


02.09.2018 - Version 3.4 released


Flight condition:

  • new Fluids available (Seawater and Freshwater)
  • definition of additional fluid parameters
  • 2D plot of the lift coefficient and Mach number as a function of speed and altitude

Airfoil import:

  • Less strict format requirements allow different number formats, comment sections and different separators. As result, it is more compatible  with the traditional online database formats and enable direct import without a  need to tweak the airfoil files by hand.


  • Improved control of panel density through strip-wise definition of density and distribution.


  • Minor bug fixes and other improvements


21.08.2018 - Version 3.3.1 released


Third-party libraries updated for stability and performance

Improved Windows Installer



12.08.2018 - Version 3.3 released


Easy access to the Quick-Start and User Guide, tutorials, and examples

through a Welcome Dialog at start-up, and a new QuickStart menu item



08.07.18 - Version 3.2 released


Licence check shows warning message when there is no internet connection.



03.06.2018 - Version 3.1 released 



  • Nacelle feature stable
  • Toolbar icons path repaired


02.06.2018 - Version 3.0 released


NEW FEATURE: Multiple wings

  • Additional wings can be added to the model, such as tail planes, split flaps, biplanes, etc.
  • Unlimited number of additional, generic wings
  • All parameters of all wings are also accessible in the optimization
  • Individual wing designations and colors easy modelling

NEW FEATURE: Additional 3D plots

  • Surface velocity vectors
  • Center of pressure location
  • Aerodynamic center location
  • Global angle of attack
  • Reynolds number (strip-wise)


  • Easy modelling of circular wings, such as engine nacelles or ring wings


  • Polar plot and aerodynamic coefficients of all wings, and of the entire aircraft, respectively.
  • Oswald factor added
  • Parameter designations improved


  • Tapered blends for twist and chord using different options (Const.,Linear,Sin,1-Cos)


  • Panel includes estimated memory requirement
  • Large models do not throw warnings anymore


  • Constraint violation penalty sign corresponds to goal type
  • Sweep variation in blends
  • And some more minor improvements


  • Geometry panel shows the Wing's dependent parameters, such as wing area and mean aerodynamic chord
  • Model tree structure improved
  • Additional model checks including penetration of symmetry plane
  • New optimization algorithm CMA-ES implemented
  • Reference system node removed. The default reference area is the projected wing area and the reference length is the mean aerodynamic chord
  • Kernel update for improved stability and performance


25.03.2018 - Version 2.5 released



  • Blending dihedral changes (e.g. for smooth transitions to winglets)
  • Undo and Redo buttons available in the toolbar


  • Solver selects Kernel according to Windows version
  • Numbered sections improve modelling


12.02.2018 - Version 2.4 released


NEW FEATURE: Constrained optimization

  • Constraints can be defined to avoid unfeasible designs. Available constraints include stability measures and the local lift coefficient.


  • Optimization algorithm BOBYQA improved
  • Minor bugfixes


31.01.2018 - Version 2.3 released


This is the initial release of Aeolus Aero Sketch Pad.