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Brian Davis, … Rob McDonald6

Nov 15

VSPAERO Issues with wing-body in 3.45.X

My recommendation is to use the thick representation for the body and fairing, and thin for the wing.

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VSPAERO Issues with wing-body in 3.45.X

My recommendation is to use the thick representation for the body and fairing, and thin for the wing.

Nov 15

Diego Elvira, Brandon Litherland6

Nov 14

VSPAERO CDi convergence issues

Thanks for the advice. I'll look into these suggestions as soon as I'm able. El El jue, 13

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VSPAERO CDi convergence issues

Thanks for the advice. I'll look into these suggestions as soon as I'm able. El El jue, 13

Nov 14

danie...@gmail.com, … Rob McDonald5

Nov 14

Bias OpenVSP Results

Sounds good, thanks guys! On Friday, November 14, 2025 at 1:38:44 PM UTC-5 Rob McDonald wrote: No.

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Bias OpenVSP Results

Sounds good, thanks guys! On Friday, November 14, 2025 at 1:38:44 PM UTC-5 Rob McDonald wrote: No.

Nov 14

Michael Kang, Brandon Litherland3

Nov 13

vspscript analysis result issue

At the step where you set the analysis input defaults, it will overwrite the saved variables in the

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vspscript analysis result issue

At the step where you set the analysis input defaults, it will overwrite the saved variables in the

Nov 13

Nov 13

Xnp shifts back by 17% cref in newer versions of OpenVSP

Starting with OpenVSP version 3.45.0 the Xnp result after a steady stability analysis shifts rearward

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Xnp shifts back by 17% cref in newer versions of OpenVSP

Starting with OpenVSP version 3.45.0 the Xnp result after a steady stability analysis shifts rearward

Nov 13

Juan Lavirgen, Rob McDonald2

Nov 12

VSPAero acronyms

Search this group, it has been explained numerous times. Rob On Wednesday, November 12, 2025 at 11:29

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VSPAero acronyms

Search this group, it has been explained numerous times. Rob On Wednesday, November 12, 2025 at 11:29

Nov 12

Mike Kelly, Rob McDonald5

Nov 12

Problems with flaps using thick analysis

It will account for camber, but not thickness. You can see the camber in the thin-surface mesh of the

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Problems with flaps using thick analysis

It will account for camber, but not thickness. You can see the camber in the thin-surface mesh of the

Nov 12

Cindy Chen, Rob McDonald4

Nov 12

User-defined step size for stability derivative calculation

No, you'll need to use 3.46.0 to use it. Rob On Wed, Nov 12, 2025 at 9:20 AM Cindy Chen <chen.

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User-defined step size for stability derivative calculation

No, you'll need to use 3.46.0 to use it. Rob On Wed, Nov 12, 2025 at 9:20 AM Cindy Chen <chen.

Nov 12

Joshua Bigland, Rob McDonald2

Nov 12

VSP aero crashing

You have all your components in both the Thick and Thin Sets. One is set to Shown (which has

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VSP aero crashing

You have all your components in both the Thick and Thin Sets. One is set to Shown (which has

Nov 12

Nov 9

Issue with FEA mm units and OpenVSP stability

Hello All, I am facing a weird issue with structures module of OpenVSP. I have generated a simple

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Issue with FEA mm units and OpenVSP stability

Hello All, I am facing a weird issue with structures module of OpenVSP. I have generated a simple

Nov 9

Carlos Rodriguez, … lsol...@gmail.com4

Nov 8

OpenVSP on Fedora 42 / Arch Linux and Wayland

I was finally able to build 3.46.0 ... using a prebuilt version of stepcode from a successful openvsp

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OpenVSP on Fedora 42 / Arch Linux and Wayland

I was finally able to build 3.46.0 ... using a prebuilt version of stepcode from a successful openvsp

Nov 8

Tijs van Stijn, Rob McDonald3

Nov 4

Weird results from VSPAERO

Oh thank you! I must have missed that somehow. Thank you for your assistance! Op dinsdag 4 november

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Weird results from VSPAERO

Oh thank you! I must have missed that somehow. Thank you for your assistance! Op dinsdag 4 november

Nov 4

Nov 4

P Stability analysis

Hi! I've run the P stability analysis for my aircraft. It produces different results for Clp,

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P Stability analysis

Hi! I've run the P stability analysis for my aircraft. It produces different results for Clp,

Nov 4

Maryam Alkhateri, Brandon Litherland11

Nov 3

Different Propeller RPMs Effect

I think that watching Rob's VSPAERO walkthrough will solve a lot of your issues. https://www.

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Different Propeller RPMs Effect

I think that watching Rob's VSPAERO walkthrough will solve a lot of your issues. https://www.

Nov 3

ReynoldsNo, Rob McDonald3

Oct 30

Thick & Thin Set Drop Downs are swapped between Case Setup & Moment Reference Position Sections

Great! And as always, Thank you for the very rapid response!!! On Thursday, October 30, 2025 at 4:28:

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Thick & Thin Set Drop Downs are swapped between Case Setup & Moment Reference Position Sections

Great! And as always, Thank you for the very rapid response!!! On Thursday, October 30, 2025 at 4:28:

Oct 30

Oct 30

Strange Value for derivatives in STAB Files

Good afternoon, I have build a somehow simplified model of a cessna 182 (cf file attached). I am

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Strange Value for derivatives in STAB Files

Good afternoon, I have build a somehow simplified model of a cessna 182 (cf file attached). I am

Oct 30

Ron, Rob McDonald2

Oct 29

Mesh Failure involving Multi-Section Wings with Cambered Airfoils

I can't give much in the way of suggestions without playing with your model. Please post it if

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Mesh Failure involving Multi-Section Wings with Cambered Airfoils

I can't give much in the way of suggestions without playing with your model. Please post it if

Oct 29

Filippo Pattacini

Oct 29

Non-dimensionalization in Stability analysis

Hello everyone, I need to clarify a few doubts about the non-dimensionalization of derivatives in the

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Non-dimensionalization in Stability analysis

Hello everyone, I need to clarify a few doubts about the non-dimensionalization of derivatives in the

Oct 29

Mohamed Hetta, Rob McDonald2

Oct 29

Getting NaN values for material laminates with cores.

3.46.0 introduced a new variant of lamination theory. The new theory can calculate the 3d through-

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Getting NaN values for material laminates with cores.

3.46.0 introduced a new variant of lamination theory. The new theory can calculate the 3d through-

Oct 29

赵天铭, … Brandon Litherland6

Oct 29

Can OpenVSP Calculate Propeller with Vx inflow and Vz inflow?

You should update to the latest OpenVSP for starters but that isn't the main issue. I understand

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Can OpenVSP Calculate Propeller with Vx inflow and Vz inflow?

You should update to the latest OpenVSP for starters but that isn't the main issue. I understand

Oct 29

Kudakwashe Mbisva, Rob McDonald3

Oct 28

creating a native open vsp model from stl files

When you import the STL file, you should be able to rotate the corresponding MeshGeom to align with

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creating a native open vsp model from stl files

When you import the STL file, you should be able to rotate the corresponding MeshGeom to align with

Oct 28

Leonardo Ungureanu, … Rob McDonald4

Oct 27

Advanced Flow Conditions tab

Wow, good catch. Looks like I need to change that format specifier to some variant of %g instead of %

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Advanced Flow Conditions tab

Wow, good catch. Looks like I need to change that format specifier to some variant of %g instead of %

Oct 27

José Roberto Clark Reis, Rob McDonald2

Oct 26

Flow field vectors on wake/behind wing/Treftz plane

Jose, You can specify a set of velocity survey points in the *.vspaero setup file. The GUI won't

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Flow field vectors on wake/behind wing/Treftz plane

Jose, You can specify a set of velocity survey points in the *.vspaero setup file. The GUI won't

Oct 26

Leonardo Ungureanu, Rob McDonald5

Oct 24

Diverging results when having wing-fuselage intersection

I see, thank you. I'll try. Best Regards, L. Ungureanu Il giorno mercoledì 22 ottobre 2025 alle

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Diverging results when having wing-fuselage intersection

I see, thank you. I'll try. Best Regards, L. Ungureanu Il giorno mercoledì 22 ottobre 2025 alle

Oct 24

Mike Vivaldi, … Brandon Litherland21

Oct 23

Fuselage model results in no VSPaero results

Hey Brandon and Rob, I was wondering if there had been any insight on your end about this issue

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Fuselage model results in no VSPaero results

Hey Brandon and Rob, I was wondering if there had been any insight on your end about this issue

Oct 23

Oct 23

Getting negative CDi from VSPAero analysis

It looks like this is coming down to panel resolution. I already have CDi in the positive by

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Getting negative CDi from VSPAero analysis

It looks like this is coming down to panel resolution. I already have CDi in the positive by

Oct 23

Simon Boudoux, Brandon Litherland3

Oct 23

Stability analysis

Ok thanks for the answer I understand. So just to be sure along x-axis on the positive side it is

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Stability analysis

Ok thanks for the answer I understand. So just to be sure along x-axis on the positive side it is

Oct 23

Simon Boudoux, Brandon Litherland3

Oct 23

Thick-Thin set propeller

Hey, so disk is perfectly fine for me. I was wondering also like adding a propeller to my model is

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Thick-Thin set propeller

Hey, so disk is perfectly fine for me. I was wondering also like adding a propeller to my model is

Oct 23

Simon Boudoux, … Brandon Litherland7

Oct 23

Trouble with no lift at trim condition

Thanks for the answer it is really nice but i think some stuffs are a bit off for me I am not really

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Trouble with no lift at trim condition

Thanks for the answer it is really nice but i think some stuffs are a bit off for me I am not really

Oct 23

Charlie Raskopf, Brandon Litherland6

Oct 23

Problems generating trimmed surface .STEP file

https://openvsp.org/wiki/doku.php?id=workshop2025 Look for the Structures content. Have you done any

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Problems generating trimmed surface .STEP file

https://openvsp.org/wiki/doku.php?id=workshop2025 Look for the Structures content. Have you done any

Oct 23

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