Vorherige Seite Inhaltsverzeichnis Nächste Seite
9.11: Split Segment

Click the folder button 'Split' to divide the active segment into two single segments.



Below a wing with two segments. The left segment shall be split.



After clicking button 'Split' the wing looks as shown below, now we have tree segments.

 

Often it is desired, to split a segment at a specific position. Enter the split position in the field 'Pos.Y [m] and then click the Button 'Split Pos. Y'.

 


A geometric peculiarity occurs with twisted wings. All chord lines between the both tip airfoils are shortened by the geometric twist. The stronger the twist, the distinct is this effect.

The following reasoning shall clarify this.
Taken two wooden strips representing the both tip airfoils of wing and mounting one thread each front side of the strips as leading and trailing edge of wing.
Now we fix one wooden strip on a table and use the other strip for simulating geometric twist. With a twist of maximal180° the leading and trailing threads will intersect and the length of chord line will become 0 at the intersection point.

With a geometric twist between 0° and 15° - typical in aircraft construction – the shortening of chord is not so serious, but still measurable. This effect has consequences both for building the wing and for the aerodynamic.
By cutting Styrofoam this effect is hardly not to avoid, the airfoils between the tips will shrink in chord length as well as in thickness.
With a rib wing one can make appropriate provisions to keep the chord length constant, but then one builds a curve into the leading / trailing edge or both.
From the aerodynamic point of view this effect has impact above all on the Reynolds number and the surface area, both will be shrinked by geometric twist.

This is the reason why you can find two radio buttons on the folder 'Split'. One is used to keep the chord line constant, the other keeps leading and trailing edge constant.

Vorherige Seite Inhaltsverzeichnis Nächste Seite