OpenVSP Tutorial: Wing Dialog Modify Tab

In this OpenVSP Tutorial we discuss the various methods for shaping a wing rib from its original shape and orientation (including changing the Leading Edge and Trailing Edge Shape) using the Wing Dialog tab "Modify".
OpenVSP is a parametric airplane configuration tool to rapidly create a new airplane design.
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[@rmcdo1]

I wish you the best of success with these videos. You might also point your viewers at the OpenVSP University videos that Brandon has been putting together.
I saw your request for negative length tip caps at the end of your video -- it might be easy, but might not. I'll add it to my list... That said, perhaps RUclips videos are not the best place to make feature requests. I suggest you use the Google Group for that.
The Modify tab was born from the fact that in engineering work, there is always something wrong with the airfoil points you have available. Most often, it has to do with trailing edge bluntness. You may be given a file representing a sharp TE, but you want to model a realistic blunt TE for your aircraft -- say a constant 1/8" out the span, but your wing is tapered, so this is very not-constant in %chord terms. Airfoil files are always specified in %chord, in x, y coordinates. Another common problem is the opposite. You are given airfoil points that are blunt, the the analysis you need to perform only works for sharp TE airfoils. Closure - Extrapolate is really about this case. If you read in a set of airfoil points with a gap at the TE, extrapolate will extend the TE to a sharp point.
The modifications at the top of the tab - shift, rotate, scale, etc. are really about specifying control surfaces or high lift devices. First you build your cruise wing in OpenVSP. Set all the parameters as normal (sweep, dihedral, taper, etc.). Next, copy/paste a duplicate version of that wing. Leave all the normal wing parameters alone. Then, go to the Modify tab, change the shift x/c to 0.8 and scale to 0.2 and theta to 20deg. All of a sudden, you're specifying a control surface airfoil in 'airfoil coordinates' -- x & y in % chord -- but the result is in 3D along your wing.
The ShiftLE parameter is there for certain poorly behaved airfoil file types. For example, leading edge slats often have really nasty geometry. Think of a comma on a bad day. Depending on how the points along the slat foil are specified, OpenVSP may have difficulty figuring out where the leading edge is located. So, ShiftLE exists so you can adjust what OpenVSP thinks is the LE of that section. 99.9% of the time, nobody will ever need it. But, it is there if you do.

[@Designer103]

Hi Rob, Thanks for the great reply. I'll try to remember to mention the OpenVSP University. It is a great resource. I make these videos first for my Designer Tier Patrons on Patreon and then make them public 6 months later so it will be a while before most viewers will see new videos.
Any serious changes that I'd like to OpenVSP I will make through the OpenVSP forum.

[@JOHNWICK-hn3ng]

Good morning, thank you