Chapter 4:
Designing Wings
VSP User Manual
25
Version 1.7.92
Turning Pipe
Now this following example could be useful in laying out V/STOL aircraft, to
show ducting running through the aircraft. For this example, the airfoil of a circle will be
used. This file may be opened in Notepad and/or Excel for editing. Remember to save
the file as .af!
1.
Open the Geom Browser and
Add
a MS Wing.
2.
Open the Multi Section Wing Geom Browser and select the
Section (Sect) tab
.
3.
Each wing section can be accessed by using the arrows next to “Section ID”.
Delete the two outer sections (sections 1 and 2) by hitting
Del
. There should be
one section left (section 0).
4.
Under the “Section Planform” box, set the “Span” to 4.0, the “TC” (tip chord) and
“RC” (root chord) to 1.0, and the “Sweep” to 0.
5.
Choose the
Foil tab
and read in the circle airfoil file for the two airfoil sections.
Access each airfoil section by using the arrows next to Airfoil:
a.
Upload the circular airfoil by clicking on the
Read File
button, and
finding the circular .af file wherever it is saved. Double click it and VSP
should read in the “airfoil” of a circle.
b.
Do this step for both Airfoil 0 and 1.
c.
The result should look like a cylinder.
6.
Go to the
Sect tab
and
Insert
six more sections, each with a span of 0.2:
a.
Click
Insert
once, and the “Total Num Secs” box should display 2.
b.
Access Section 1 and change the span to 0.2.
c.
Click
Insert
five more times until the “Total Num Secs” box displays 7.
d.
Check to make sure Sections 1 through 6 have spans of 0.2.
7.
Choose the
Dihed tab
.
8.
For all joints listed below change the Dihed angles. Make sure to select the
Rotate
Foil To Match Dihedral
button for each joint, so that the box is yellow. Access
each joint by using the arrow buttons next to Joint ID:
a.
For Joint 0 set “Dihed 1” to 0 and “Dihed 2” to 15.
b.
For Joint 1 set “Dihed 1” to 15 and “Dihed 2” to 30.
c.
For Joint 2 set “Dihed 1” to 30 and “Dihed 2” to 45.
d.
For Joint 3 set “Dihed 1” to 45 and “Dihed 2” to 60.
e.
For Joint 4 set “Dihed 1” to 60 and “Dihed 2” to 75.
f.
For Joint 5 set “Dihed 1” to 75 and “Dihed 2” to 90.
g.
Double check to make sure you hit the
Rotate Foil To Match Dihedral
button for each joint, so that the box is yellow.
9.
Choose the
Sect tab
.
10.
Access Section 6 and delete it by clicking
Del
11.
Insert
one more section at the end (after Section 5) with a “Span” of 0.2.
12.
Choose the
Dihed tab
. For Joint 5, set “Dihed 1” to 75 and “Dihed 2” to 90. Make
sure the
Rotate Foil to Match Dihedral
button is activated.
13.
Click the
XForm tab
. Set “Symmetry” under the “Transforms” section to None.
