Fuselage calculation problem

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Di Wu

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Mar 21, 2026, 7:39:28 AMMar 21
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Hello VSP team,

I am a new beginner of OpenVSP. Recently, I am trying to build the first airplane. However I met a problem in aerodynamics calculation on fuselage. The iteration shows NAN in calculation even I only caldulted the fuselage. I do not know where was the problem.

ps. the same settings are also used to calculate the wing and tail, it seems OK.

7c299153d45ff97b45a843f96ce7925c.png
TEST_cal.vsp3

Rob McDonald

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Mar 21, 2026, 11:53:14 AMMar 21
to ope...@googlegroups.com
First, you're using an old version of OpenVSP with an old version of VSPAERO.  You should upgrade.

The problem with the fuselage is something to do with the final cross section.  It may be the skinning settings, or perhaps something else.  I added an additional final XSec, set it to a point, and changed skinning to achieve what you're after here.  I also ran the fuselage as a thick body -- since that is likely what you want.

So, update to the new version, work on the aft cross section, you should make some progress.

Rob


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