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9.5: Input Sweep

Click the folder button 'Sweep'. The segment sweep angle can be entered into the input field 'Sweep Angle [°]'. Valid values lie between -89° and +89°.
Near the input field are Up/Down-buttons located. They can be used to change the segment sweep 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 picture below shows a wing with four segments. The two inner segments have a sweep angle of +25°; the outer segments have a sweep angle of -25°.



With little skill curved wings e.g. parabola or crescent wings can be created. The reference line was set to 0%, the sweep angles refer to leading edge.



In many cases it makes sense to change the value for the reference line, e.g. if you want to straighten the trailing edge or if you need a strait c/4-line.

The value for the reference line is entered into the input field 'Reference Line [%]'. Valid values lie between 0% and 100%.

Near the input field are Up/Down-buttons located. They can be used to change the value for the reference line with mouse clicks.
A click on the right mouse button pops up a menu to set the increment between 0.00001% and 1%.
There is a third method to change the value. Move the mouse cursor into the input field and click the right mouse button.
A pull-down menu pops up and offers the pre-set values 0%, 25%, 50%, 75%, 100% for quick selection.



The following pictures illustrate the effect of the reference line. In the first picture you can see a wing whose trailing edge shall be straightened.



First of all we set the value for the reference line to 100% and than we enter 0° as sweep angle for every segment. As a result, we get a straight trailing edge.



In folder 'Wing', subfolder 'Sweep' you find a functionality analogue to the 'Reference point chord [%]' (see Chapter 9.3).

 

|hardcopy|2009/12/11 15:38:16
Uwe
MINI-PC

 

The 'Sweep Angle [°]' and the 'Reference Line [%]' also apply to the entire wing. While optimizing wing geometries these values can be set in every segment for the wing. The computations will be recalculated for the whole wing accordingly to the changed values.  These values can be changed as often as necessary for optimization.


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