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14.4: Centre of Gravity

Click the folder button 'Design Computation' and click into input field 'CG X [m]' to enter the desired value. All values are valid; the dimensional unit for entered data is 'meter' [m]. The centre of gravity is related to the airplane's zero-point in X-direction. Since the zero point of the airplane can be shifted, one must watch out here little. For the beginning it is useful to put the airplane's zero-point to the leading edge of the foremost wing, in order to exclude misunderstandings.
Near the input field are Up/Down-buttons located. They can be used to change the centre of gravity with mouse clicks.
A click on the right mouse button pops up a menu to set the increment between 0.00001m and 1m.



Below the input fields the button 'Start Computation' is located. If you click this button, the Vortex-Lattice computation will start. An iteration computation with several passes (approximate computation) starts. The program changes stepwise the angle of attack to approximate the desired centre of gravity. If the program exceeds 90° angle of attack, the computation will abort with an error message.


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