17.2: Angle of Incidence Computation
Like in chapter 17.1 we use the glider 'ASK21_EN.flz' for our example. Please
open the file 'ASK21_EN.flz' and select the folder 'Total-Polars Computation'
and the subfolder 'Computation of AoI-difference'.
In this example we simulate the wings angle of incidence in a specified angel
range and we fix the horizontal stabilizer at 0°.
We enter into the first table row wing number 0, this is the wing. If one does
not know the number of the wing, one can drag and drop the wing from the
2D-graphic into the list. Therefore click the wing in the 2D-graphic with the
right mouse button, keep mouse button pressed and pull the wing into the list. Into
the second table row we enter number 1, the horizontal stabilizer. Entries with
a wing number of -1 are ignored.
We enter for the min. and the max. angle of the
wing 0° and 2°, and leave the appropriate fields for the horizontal stabilizer
at 0°. The number of steps are set to 20.
The picture below shows these entries.
Again we use 'Fix Centre of Gravity' for the following polars computation. The
polars computation can now be started by click on the button 'Start Computations'.
First a window will pop up, in which we can enter a remark about the
computation, e.g. 'AoI Wing, Horizontal Stabilizer fixed'. After confirming the
entry with clicking on button 'OK', the polars computation will be started.
The program first sets all flaps and all angles
of incidence of all surfaces to 0°. The originally settings are backed up, they
will be restored after computation. In a loop the wings AoI is set step by step
from +2° to 0° in 0.1° decrements.
After the computations one can examine the
polars. See: 17.3: Viewing Polars as Table or Graphic