Issue with full-chord rudder
Filippo Pattacini
Hi everyone,
I'm trying to model the FUNCUB Multiplex in OpenVSP, but I'm running into some issues with the rudder. As you can see in the image, the rudder is composed of two parts with different chords. Since OpenVSP doesn't allow varying the chord within a single control surface, I had to create two separate rudder surfaces: one at the tip, extending along the full chord, and one at the root, covering about half the chord of the vertical stabilizer.
However, the full-chord section of the rudder has an oblique leading edge, which causes the hinge rotation to be misaligned with the rest of the rudder (instead of giving a purely horizontal deflection). How can I fix this?
I'm sure this is a common issue, does anyone know how to solve it?
Thank you very much!
Rob McDonald
SubSurface based control surfaces always set the hinge point to the leading edge of the surface.
Rob
Filippo Pattacini
Thank you for your advice.
I tried to follow your suggestion, but I am still not fully sure how to correctly edit the *.csf file.
Referring to the image above, in the *.csf file I currently have the following situation for the full-chord rudder:
CSurf ID: FFFCFRVKZV
CSurf Name: RudderOut
Geom ID: YEWNNNUMNE
Geom Name: V-Tail
VSPAERO Name: V-Tail_Surf0_RudderOut
Tagfile Name: FUNCUB_defV-Tail_Surf0_RudderOut
Surface #: 0
Part #: 5
2 Both
2 Hinge UV
0.6000002667 0.5
1 0.5
I understand that the first values (0.6 and 1) refer to the spanwise direction, while the second ones are along the chordwise direction. However, I don’t understand why the values are set to 0.5 if my control surface actually starts from the leading edge. What should I change in order to fix this and obtain a purely horizontal deflection?