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Anuj Kumar, … Steven Zhu8

Oct 4

Errors while obtaining aero coefficients with control suface deflection on OpenVSP 3.45.4

Hi, I was using VSP 3.46.0 and believe I may have found a potential bug related to the naming of

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Errors while obtaining aero coefficients with control suface deflection on OpenVSP 3.45.4

Hi, I was using VSP 3.46.0 and believe I may have found a potential bug related to the naming of

Oct 4

Séraphin Remy, … Rob McDonald16

Oct 2

Stall modelling using 2DClmax

Not really, no. I'll pass it on to the developer of VSPAERO. For now, I would just set Clo2D to

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Stall modelling using 2DClmax

Not really, no. I'll pass it on to the developer of VSPAERO. For now, I would just set Clo2D to

Oct 2

Mike Vivaldi, … Brandon Litherland20

Oct 1

Fuselage model results in no VSPaero results

Hi Brandon and Rob, I've tried to isolate the issue one parameter at a time and I can't

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Fuselage model results in no VSPaero results

Hi Brandon and Rob, I've tried to isolate the issue one parameter at a time and I can't

Oct 1

Tim Swait, … Constantine Kryvomaz4

Oct 1

Winglet optimisation

Thanks Tim, for sharing info Greatly appreciated On Wed, 1 Oct 2025 at 14:25, Tim Swait <timswait@

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Winglet optimisation

Thanks Tim, for sharing info Greatly appreciated On Wed, 1 Oct 2025 at 14:25, Tim Swait <timswait@

Oct 1

Rob McDonald, Mike Vivaldi2

Sep 30

OpenVSP 3.46.0 Released

"The FitAFCST API call had a bug that kept it from ever working. This bug dates to 2015.

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OpenVSP 3.46.0 Released

"The FitAFCST API call had a bug that kept it from ever working. This bug dates to 2015.

Sep 30

p lei, Rob McDonald2

Sep 30

NGon mesh has non manifold edges so vspaero cannot handle it

Please be sure to post the version of a file that can replicate the problem. You mentioned being able

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NGon mesh has non manifold edges so vspaero cannot handle it

Please be sure to post the version of a file that can replicate the problem. You mentioned being able

Sep 30

Charlie Raskopf, Rob McDonald2

Sep 30

VSPAero Crashes (3.45.5) with fairly simple geometries?

Please go watch the VSPAERO videos from the recent OpenVSP Workshop. https://openvsp.org/wiki/doku.

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VSPAero Crashes (3.45.5) with fairly simple geometries?

Please go watch the VSPAERO videos from the recent OpenVSP Workshop. https://openvsp.org/wiki/doku.

Sep 30

Rexus Gan, Rob McDonald4

Sep 30

Exporting Cross section Using Xsec(.hrm) to Freecad

You may want to try exporting as a STEP file as a first attempt. Rob On Tue, Sep 30, 2025 at 10:05 AM

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Exporting Cross section Using Xsec(.hrm) to Freecad

You may want to try exporting as a STEP file as a first attempt. Rob On Tue, Sep 30, 2025 at 10:05 AM

Sep 30

Kartikey Karnwal, … Rob McDonald5

Sep 29

Difficulty in Obtaining Aerodynamic Coefficients for Lenticular Geometry

Dear Sir, Thank you very much for your prompt response. I will certainly review all the parameters

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Difficulty in Obtaining Aerodynamic Coefficients for Lenticular Geometry

Dear Sir, Thank you very much for your prompt response. I will certainly review all the parameters

Sep 29

Alex Maxwell, Mike Vivaldi3

Sep 27

VSPAero crashes upon clicking 'Prepare Solver' or 'Launch Solver' v3.45.0

A couple of other issues. It seems rotating the inlets -90 degrees results in a crash even with just

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VSPAero crashes upon clicking 'Prepare Solver' or 'Launch Solver' v3.45.0

A couple of other issues. It seems rotating the inlets -90 degrees results in a crash even with just

Sep 27

Zachary Law, Rob McDonald5

Sep 27

FEA Property Functionality in OpenVSP

Thank you for clarifying how the FEA Properties were working behind the scenes, I couldn't find

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FEA Property Functionality in OpenVSP

Thank you for clarifying how the FEA Properties were working behind the scenes, I couldn't find

Sep 27

Mike Vivaldi, Rob McDonald2

Sep 24

Documentation regarding VSPAERO Convergence Factors variables

VSPAERO has multiple convergence loops. In a normal solve, there are two main loops. There is a

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Documentation regarding VSPAERO Convergence Factors variables

VSPAERO has multiple convergence loops. In a normal solve, there are two main loops. There is a

Sep 24

Brandon Litherland, skyc...@gmail.com3

Sep 23

OpenVSP Ground School is Moving!

Awesome, thanks Brandon! On Monday, September 22, 2025 at 1:40:18 PM UTC-7 Brandon Litherland wrote:

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OpenVSP Ground School is Moving!

Awesome, thanks Brandon! On Monday, September 22, 2025 at 1:40:18 PM UTC-7 Brandon Litherland wrote:

Sep 23

skyc...@gmail.com

Sep 23

VSPAero .lod results with new thin/thick method

Hello, I'm missing the component summation portion of the .lod file when running analysis in

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VSPAero .lod results with new thin/thick method

Hello, I'm missing the component summation portion of the .lod file when running analysis in

Sep 23

مريم راشد, Brandon Litherland2

Sep 19

Question about AeroVSP Analysis with Rotating Propellers

VSPAERO does not compute the "steady" stability derivatives in unsteady mode. The steady

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Question about AeroVSP Analysis with Rotating Propellers

VSPAERO does not compute the "steady" stability derivatives in unsteady mode. The steady

Sep 19

Abdullah Mejbil, Rob McDonald3

Sep 18

VSPAERO Input Files and Aerostructural Analysis

Thank you for the explanation Rob! If anyone knows how the loads are transferred from the VLM

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VSPAERO Input Files and Aerostructural Analysis

Thank you for the explanation Rob! If anyone knows how the loads are transferred from the VLM

Sep 18

湯勛云, Brandon Litherland2

Sep 17

[OpenVSP] Propeller prediction and experimental testing

We see this fairly often and not just in the Google Group. I'll credit XKCD with the image below

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[OpenVSP] Propeller prediction and experimental testing

We see this fairly often and not just in the Google Group. I'll credit XKCD with the image below

Sep 17

Filippo Pattacini, Rob McDonald3

Sep 17

Issue with full-chord rudder

Thank you for your advice. I tried to follow your suggestion, but I am still not fully sure how to

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Issue with full-chord rudder

Thank you for your advice. I tried to follow your suggestion, but I am still not fully sure how to

Sep 17

Mike Kelly, Rob McDonald4

Sep 17

Landing Gear Rim Size

Thanks for that additional information. That may help me track down the issue... Rob On Tuesday,

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Landing Gear Rim Size

Thanks for that additional information. That may help me track down the issue... Rob On Tuesday,

Sep 17

Vivian Kaspar, … Omer Kandemir4

Sep 15

Changing Airfoil shape parameters

Hi Vivian, I think you need to call "vsp.Update()" after changing XSecShape as follows:

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Changing Airfoil shape parameters

Hi Vivian, I think you need to call "vsp.Update()" after changing XSecShape as follows:

Sep 15

Mike Vivaldi, Rob McDonald2

Sep 15

VSPAero Stall model on wing with multiple airfoils

I would probably look at the load distribution to see where the wing stalls first and then use the

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VSPAero Stall model on wing with multiple airfoils

I would probably look at the load distribution to see where the wing stalls first and then use the

Sep 15

Mike Vivaldi, Rob McDonald4

Sep 15

Discontinuity handling in fit model.

OK, in that case, LowStr is being driven to zero. You can set it to something reasonable and then

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Discontinuity handling in fit model.

OK, in that case, LowStr is being driven to zero. You can set it to something reasonable and then

Sep 15

Peter Hauschild, … skyc...@gmail.com23

Sep 10

Creating FEM models for CalculiX

This is reopening a very old thread, but at the beginning of this thread I tried to show a simple

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Creating FEM models for CalculiX

This is reopening a very old thread, but at the beginning of this thread I tried to show a simple

Sep 10

danie...@gmail.com, Rob McDonald2

Sep 9

How to hide Centerline Plane

That is a representation of the VSPAERO slice plane. It will go away if you close the VSPAERO GUI. Or

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How to hide Centerline Plane

That is a representation of the VSPAERO slice plane. It will go away if you close the VSPAERO GUI. Or

Sep 9

Steven Zhu, … Brandon Litherland7

Sep 9

VLM Solver Stuck on Wake Grid Merging with Control Surface

Weird. Reducing the num U and W down to 21 lets it run fine. I tried again and got it working by only

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VLM Solver Stuck on Wake Grid Merging with Control Surface

Weird. Reducing the num U and W down to 21 lets it run fine. I tried again and got it working by only

Sep 9

Mike Vivaldi, … Brandon Litherland5

Sep 9

Fit Model question

The 2025 OpenVSP Workshop has a great presentation by Rob covering surface representation in detail.

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Fit Model question

The 2025 OpenVSP Workshop has a great presentation by Rob covering surface representation in detail.

Sep 9

Kilian, … Rob McDonald5

Sep 8

Completely different results for CMy after switching to 3.45.4

Can you provide a simplified test case that exhibits the change you're seeing? Rob On Monday,

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Completely different results for CMy after switching to 3.45.4

Can you provide a simplified test case that exhibits the change you're seeing? Rob On Monday,

Sep 8

Mike Vivaldi, Rob McDonald14

Sep 6

stl face deletion

If you import a Xsec (*.hrm) or Plot3D (*.p3d) file as wireframe (not as a mesh), then OpenVSP will

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stl face deletion

If you import a Xsec (*.hrm) or Plot3D (*.p3d) file as wireframe (not as a mesh), then OpenVSP will

Sep 6

Mike Vivaldi, Rob McDonald2

Sep 6

Result interpretation

There are a bunch of related coefficients with different subscripts. This has changed somewhat from

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Result interpretation

There are a bunch of related coefficients with different subscripts. This has changed somewhat from

Sep 6

Kilian, Mikel Catania3

Sep 5

Aerodynamic Coefficients per Component

Thanks Mikel, I guess you are right. However, I only have VortexSheet 1 to 6 although my model should

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Aerodynamic Coefficients per Component

Thanks Mikel, I guess you are right. However, I only have VortexSheet 1 to 6 although my model should

Sep 5

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