8.14: Input Angle for Geometric Twist
Often it is necessary to twist a wing in order to constrain a definite lift
distribution.
Click the folder button 'Angle'. The root wash angle will be displayed in the
input field 'Root Wash Angle [°]'.
Valid values lie between -45° and +45°.
The wash angles centre of rotation lies at the leading edge.
Near the input field are Up/Down-buttons located. They can be used to change
the root wash angle with mouse clicks.
A click on the right mouse button pops up a menu to set the increment between 0.00001°
and 1°.
The following picture shows three wings. The left wing has no twist, the middle
wing has 20° twist at the root airfoil and the right wing has -20° twist.
The shown angles are strongly exaggerated, normally geometric twist angles
range between 2° and 10°.