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Selig S3021 airfoil
What is the exact shape of the Selig S3021 airfoil? · Standard part · basis: Coordinates from the UIUC Airfoil Coordinates Database; thickness, camber and section by Xem Studio
Also called: s3021, s3021-095-84, Selig S3021 coordinates, Selig S3021 dat, Selig S3021 STEP, Selig S3021 STL, Selig S3021 profile
Exact dimensions. True size, with no printing tolerance added.
- length
- 100.0 mm
- width
- 20.0 mm
- height
- 9.47 mm
Notes
- Selig S3021: Michael Selig (S series). Maximum thickness 9.47 % of chord at 30.0 % chord; maximum camber 2.96 % of chord at 39.2 % chord.
- Coordinates from the UIUC Airfoil Coordinates Database (M. Selig, UIUC Applied Aerodynamics Group), file s3021.dat, titled 'S3021-095-84'. Thickness and camber are computed by Xem Studio from those points (vertical distance at equal x, linear between points).
- The published trailing edge is sharp, so the section uses it as printed.
- The file is a 100 mm chord section, 20 mm deep: scale it uniformly to your chord, or import the STEP and sweep or loft it into a wing. Thickness scales with chord; the shape is the same at any size.
Selig S3021 airfoil size chart
| parameter | value | source |
|---|---|---|
| Max thickness | 9.47 % chord at 30.0 % chord | computed from the UIUC coordinates |
| Max camber | 2.96 % chord at 39.2 % chord | computed from the UIUC coordinates |
| Published points | 61 (32 upper, 30 lower, shared leading edge) | UIUC coordinates |
| Trailing edge as published | sharp (closed) | UIUC coordinates |
| y at x = 1.25 % chord | upper +1.679 / lower -0.928 % chord | linear between the published points (UIUC coordinates) |
| y at x = 2.5 % chord | upper +2.548 / lower -1.263 % chord | linear between the published points (UIUC coordinates) |
| y at x = 5 % chord | upper +3.753 / lower -1.631 % chord | linear between the published points (UIUC coordinates) |
| y at x = 7.5 % chord | upper +4.643 / lower -1.845 % chord | linear between the published points (UIUC coordinates) |
| y at x = 10 % chord | upper +5.334 / lower -1.975 % chord | linear between the published points (UIUC coordinates) |
| y at x = 15 % chord | upper +6.341 / lower -2.073 % chord | linear between the published points (UIUC coordinates) |
| y at x = 20 % chord | upper +6.982 / lower -2.063 % chord | linear between the published points (UIUC coordinates) |
| y at x = 25 % chord | upper +7.386 / lower -1.988 % chord | linear between the published points (UIUC coordinates) |
| y at x = 30 % chord | upper +7.596 / lower -1.874 % chord | linear between the published points (UIUC coordinates) |
| y at x = 40 % chord | upper +7.498 / lower -1.599 % chord | linear between the published points (UIUC coordinates) |
| y at x = 50 % chord | upper +6.861 / lower -1.304 % chord | linear between the published points (UIUC coordinates) |
| y at x = 60 % chord | upper +5.805 / lower -1.015 % chord | linear between the published points (UIUC coordinates) |
| y at x = 70 % chord | upper +4.494 / lower -0.744 % chord | linear between the published points (UIUC coordinates) |
| y at x = 80 % chord | upper +3.063 / lower -0.493 % chord | linear between the published points (UIUC coordinates) |
| y at x = 90 % chord | upper +1.567 / lower -0.251 % chord | linear between the published points (UIUC coordinates) |
| y at x = 95 % chord | upper +0.768 / lower -0.103 % chord | linear between the published points (UIUC coordinates) |
| Coordinates source | UIUC Airfoil Coordinates Database: s3021.dat ('S3021-095-84') | UIUC Applied Aerodynamics Group (M. Selig) |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| UIUC Applied Aerodynamics Group (M. Selig) | UIUC Airfoil Coordinates Database: s3021.dat ('S3021-095-84') | web | UIUC Airfoil Coordinates Database, public research data; coordinates are facts, cited and linked, not rehosted |
| UIUC Applied Aerodynamics Group (M. Selig) | UIUC Airfoil Coordinates Database (original: Michael Selig (S series)) | web | UIUC Airfoil Coordinates Database, public research data; coordinates are facts, cited and linked, not rehosted |
Free files
★ Free files 1 parts. Xem Studio design: free to use, print and sell things from; not to be republished as files. Xem Studio Design License. index.json
| s3021-airfoil-section-100mm-chord | Selig S3021 section, 100 mm chord × 20 mm span, 60 points from the published coordinates, single trailing-edge point (scale to your chord) | STEP · STL |
https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.Plain text: sheet.txt · JSON: /api/geometry?object=s3021-airfoil
Fits with
Questions
How thick is the Selig S3021?
Maximum thickness 9.47 % of chord at 30.0 % chord: 9.47 mm on a 100 mm chord (computed from the UIUC coordinates).
How much camber does the Selig S3021 have?
Maximum camber 2.96 % of chord at 39.2 % chord (computed from the UIUC coordinates).
How do I use it for my wing?
Scale the 100 mm section to your chord (e.g. 180 mm chord = 180 % scale), then extrude or loft between root and tip sections. For a tapered wing, scale a root and a tip copy and loft between them.