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1:58 PM

Guidance on building models with vertical tails

Hi all, I am running a VSPAero analysis on a BWB with two vertical fins near the trailing edge of the

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Guidance on building models with vertical tails

Hi all, I am running a VSPAero analysis on a BWB with two vertical fins near the trailing edge of the

1:58 PM

Ayush Jain, Rob McDonald3

11:31 AM

Trimmed IGES and STEP Internal Structures Export

Thank you! On Tuesday, May 12, 2026 at 11:11:55 AM UTC-4 Rob McDonald wrote: Instead of calling

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Trimmed IGES and STEP Internal Structures Export

Thank you! On Tuesday, May 12, 2026 at 11:11:55 AM UTC-4 Rob McDonald wrote: Instead of calling

11:31 AM

Patrick Hammer, Rob McDonald5

10:52 AM

Download Archive

Nevermind, I need to hold it longer. I'm good now. Patrick On Thu, May 14, 2026 at 10:51 AM

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Download Archive

Nevermind, I need to hold it longer. I'm good now. Patrick On Thu, May 14, 2026 at 10:51 AM

10:52 AM

Jannis Heinemann, Rob McDonald6

May 13

Strange second dataset

I re-ran both cases best of the first case with Re = 1.01199e7 and they were identical, so the

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Strange second dataset

I re-ran both cases best of the first case with Re = 1.01199e7 and they were identical, so the

May 13

Carla Conejero Amarilla

May 13

Thin-thick analysis

Hi everyone, I've been having trouble using the thin and thick surface analysis methods,

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Thin-thick analysis

Hi everyone, I've been having trouble using the thin and thick surface analysis methods,

May 13

Agustin Buffa, … Rob McDonald4

May 13

Build geometry from STL file

Wow, I had no memory of writing that. Thanks for bringing it back to the surface. Rob On Wednesday,

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Build geometry from STL file

Wow, I had no memory of writing that. Thanks for bringing it back to the surface. Rob On Wednesday,

May 13

Agustin Buffa, Rob McDonald2

May 12

Air intake model

You should check out the 'Integrated Flowpath Modeling' presentation from the 2025 Workshop

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Air intake model

You should check out the 'Integrated Flowpath Modeling' presentation from the 2025 Workshop

May 12

Edward Pickens, … Zach Hazen8

May 11

Replicating Karoo's non-planar geometry paper

I turned XZ symmetry on in the VSPAERO menu. I deleted the slice at Y = 0 (not sure if this matters).

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Replicating Karoo's non-planar geometry paper

I turned XZ symmetry on in the VSPAERO menu. I deleted the slice at Y = 0 (not sure if this matters).

May 11

Jaime García, Rob McDonald8

May 10

Help needed with Unsteady analysis: store dropped

Thanks, Rob! I've build the software with the change and it still doesn't work. It must be

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Help needed with Unsteady analysis: store dropped

Thanks, Rob! I've build the software with the change and it still doesn't work. It must be

May 10

catherine a, … Jannis Heinemann5

May 10

A320neo model — spikes in load distribution and unusually low drag polar (VSPAERO 3.45.4, Windows)

There seem to be several post regarding this topic with no solution so far: https://groups.google.com

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A320neo model — spikes in load distribution and unusually low drag polar (VSPAERO 3.45.4, Windows)

There seem to be several post regarding this topic with no solution so far: https://groups.google.com

May 10

May 9

OpenVSP 3.50.2 Released

Don't forget to register for the OpenVSP Workshop. August 4-6 in Daytona Beach Florida. Mostly

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OpenVSP 3.50.2 Released

Don't forget to register for the OpenVSP Workshop. August 4-6 in Daytona Beach Florida. Mostly

May 9

Andreas Chris, … Rob McDonald4

May 9

Issue Exporting IGES Structure – FEA Parts Not Recognized After ReadVSPFile

Thanks Rob, this method works perfectly. Appreciate the explanation and workaround until the next

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Issue Exporting IGES Structure – FEA Parts Not Recognized After ReadVSPFile

Thanks Rob, this method works perfectly. Appreciate the explanation and workaround until the next

May 9

Lin Livrin, Rob McDonald2

May 9

Different solutions to same setup on different versions of vspAERO

A ton of stuff changed in the solver during that time. The adjoint capability in the solver was

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Different solutions to same setup on different versions of vspAERO

A ton of stuff changed in the solver during that time. The adjoint capability in the solver was

May 9

Koaib Kaleem, Brandon Litherland3

May 8

degen_geom not importable after pip install -r requirements-dev.txt (OpenVSP 3.49.0, Python 3.11)

Great, Thank You On Friday, May 8, 2026 at 4:09:41 PM UTC+5 Brandon Litherland wrote: the degen_geom

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degen_geom not importable after pip install -r requirements-dev.txt (OpenVSP 3.49.0, Python 3.11)

Great, Thank You On Friday, May 8, 2026 at 4:09:41 PM UTC+5 Brandon Litherland wrote: the degen_geom

May 8

Demetrio Cucarella

May 7

Stability analisis

Hi everyone, i am currently working on the analisys of stability of a modified MQ9 Reaper. I have a

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Stability analisis

Hi everyone, i am currently working on the analisys of stability of a modified MQ9 Reaper. I have a

May 7

Avijeet Acharya, … Brandon Litherland4

May 7

Building Python API on Windows

Rob, Thanks for the detailed step-by-step instructions. It worked!! Brandon, I'll try it out.

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Building Python API on Windows

Rob, Thanks for the detailed step-by-step instructions. It worked!! Brandon, I'll try it out.

May 7

Jasper, … Rob McDonald5

May 7

Flaps curving instead of being straight when extended spanwise with fixed length

Dear Brandon and Rob, Thank you for the quick responses, that makes it clear. I have now adjusted the

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Flaps curving instead of being straight when extended spanwise with fixed length

Dear Brandon and Rob, Thank you for the quick responses, that makes it clear. I have now adjusted the

May 7

Rob McDonald, … Mike Kelly4

May 6

To clarify, my use of the term "digital twin" was inaccurate. It is more of a trim solver

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To clarify, my use of the term "digital twin" was inaccurate. It is more of a trim solver

May 6

Miro Grulovic, … Brandon Litherland6

May 5

WHERE IS PANEL METHOD

I'm wondering what issues you have had with Thick components. On Sunday, May 3, 2026 at 7:20:03

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WHERE IS PANEL METHOD

I'm wondering what issues you have had with Thick components. On Sunday, May 3, 2026 at 7:20:03

May 5

Brian Davis, Rob McDonald4

May 5

VSPAERO stability increments

I just ran a super simple case with unsteady adjoint - and it worked fine. So, there must be

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VSPAERO stability increments

I just ran a super simple case with unsteady adjoint - and it worked fine. So, there must be

May 5

Flavio, Rob McDonald7

May 4

Issue with wetted area ????

OK, 3.50.1 is available now with this fixed. Rob On Monday, May 4, 2026 at 12:39:45 PM UTC-7 Rob

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Issue with wetted area ????

OK, 3.50.1 is available now with this fixed. Rob On Monday, May 4, 2026 at 12:39:45 PM UTC-7 Rob

May 4

George Noble, Rob McDonald4

May 4

Ribs being generated at an angle

The file you attached does not have any structure definition in it. There are a few videos on the

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Ribs being generated at an angle

The file you attached does not have any structure definition in it. There are a few videos on the

May 4

aschrist, … George Efrem5

May 3

How to modify Eta and XoC of a FEA_POLY_SPAR via API?

Thank you, Rob. I appreciate the quick update and for including it in the API. That solves the issue

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How to modify Eta and XoC of a FEA_POLY_SPAR via API?

Thank you, Rob. I appreciate the quick update and for including it in the API. That solves the issue

May 3

May 2

OpenVSP 3.50.0 Released

This release comes with a handful of small features and some nice bug fixes. It probably would have

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OpenVSP 3.50.0 Released

This release comes with a handful of small features and some nice bug fixes. It probably would have

May 2

Simon Boudoux, Rob McDonald6

May 1

Problem Difference in C.G in Mass Props

You can absolutely use both. Use the volumetric density and priorities to handle the volume. Use area

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Problem Difference in C.G in Mass Props

You can absolutely use both. Use the volumetric density and priorities to handle the volume. Use area

May 1

May 1

How to build a flap using hinge coordinate system?

Sua solicitação (80) foi recebida e está sendo analisada por nossa equipe de suporte. Para adicionar

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How to build a flap using hinge coordinate system?

Sua solicitação (80) foi recebida e está sendo analisada por nossa equipe de suporte. Para adicionar

May 1

Lorenzo “Lollo” Minnozzi2

Apr 30

VSPaero issues while analyzing THICK control surfaces

I'm pretty sure there will be someone who encounters the same problem so here it is how I "

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VSPaero issues while analyzing THICK control surfaces

I'm pretty sure there will be someone who encounters the same problem so here it is how I "

Apr 30

Michael Stalls, Rob McDonald3

Apr 29

Structures and (FAR23) loads

thanks for this! On Monday, April 27, 2026 at 2:15:09 PM UTC+10 Rob McDonald wrote: Check out the

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Structures and (FAR23) loads

thanks for this! On Monday, April 27, 2026 at 2:15:09 PM UTC+10 Rob McDonald wrote: Check out the

Apr 29

Hans, … Brandon Litherland6

Apr 27

VSPAERO Fuselage Issue

Rob and Brandon thanks you all Got it. These "rows" is dissapeared when the geometry for

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VSPAERO Fuselage Issue

Rob and Brandon thanks you all Got it. These "rows" is dissapeared when the geometry for

Apr 27

Adrian Fistoli, Rob McDonald2

Apr 27

Torque sign convention in VSPAero

I recommend you conduct some simple experiments to test this out and convince yourself of the sign

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Torque sign convention in VSPAero

I recommend you conduct some simple experiments to test this out and convince yourself of the sign

Apr 27

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