# RG15 airfoil

> What is the exact shape of the RG15 airfoil?

- Category: Airfoils › Other airfoils
- Kind: Standard part
- Basis: Coordinates from the UIUC Airfoil Coordinates Database; thickness, camber and section by Xem Studio
- Page: https://xemstudio.com/objects/rg15-airfoil/ · JSON: https://xemstudio.com/api/geometry?object=rg15-airfoil · Plain text: https://xemstudio.com/objects/rg15-airfoil/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files Xem Studio Design License (free to use and sell from, not to redistribute as files: https://xemstudio.com/license/)
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

## Overall (mm)

| length | width | height |
|---|---|---|
| 100.0 | 20.0 | 8.92 |

**Exact dimensions.** True size, with no printing tolerance added.

## Notes

- RG15: Rolf Girsberger (RG series). Maximum thickness 8.92 % of chord at 30.2 % chord; maximum camber 1.76 % of chord at 39.7 % chord.
- Coordinates from the UIUC Airfoil Coordinates Database (M. Selig, UIUC Applied Aerodynamics Group), file rg15.dat, titled 'RG-15 8.9%'. 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.

## Sizes

| parameter | value | source |
|---|---|---|
| Max thickness | 8.92 % chord at 30.2 % chord | computed from the UIUC coordinates |
| Max camber | 1.76 % chord at 39.7 % chord | computed from the UIUC coordinates |
| Published points | 62 (32 upper, 31 lower, shared leading edge) | UIUC coordinates |
| Trailing edge as published | sharp (closed) | UIUC coordinates |
| y at x = 1.25 % chord | upper +1.414 / lower -1.007 % chord | linear between the published points (UIUC coordinates) |
| y at x = 2.5 % chord | upper +2.128 / lower -1.385 % chord | linear between the published points (UIUC coordinates) |
| y at x = 5 % chord | upper +3.113 / lower -1.863 % chord | linear between the published points (UIUC coordinates) |
| y at x = 7.5 % chord | upper +3.825 / lower -2.165 % chord | linear between the published points (UIUC coordinates) |
| y at x = 10 % chord | upper +4.371 / lower -2.378 % chord | linear between the published points (UIUC coordinates) |
| y at x = 15 % chord | upper +5.166 / lower -2.620 % chord | linear between the published points (UIUC coordinates) |
| y at x = 20 % chord | upper +5.675 / lower -2.743 % chord | linear between the published points (UIUC coordinates) |
| y at x = 25 % chord | upper +5.992 / lower -2.782 % chord | linear between the published points (UIUC coordinates) |
| y at x = 30 % chord | upper +6.155 / lower -2.763 % chord | linear between the published points (UIUC coordinates) |
| y at x = 40 % chord | upper +6.114 / lower -2.595 % chord | linear between the published points (UIUC coordinates) |
| y at x = 50 % chord | upper +5.709 / lower -2.287 % chord | linear between the published points (UIUC coordinates) |
| y at x = 60 % chord | upper +5.020 / lower -1.784 % chord | linear between the published points (UIUC coordinates) |
| y at x = 70 % chord | upper +4.097 / lower -1.102 % chord | linear between the published points (UIUC coordinates) |
| y at x = 80 % chord | upper +2.971 / lower -0.448 % chord | linear between the published points (UIUC coordinates) |
| y at x = 90 % chord | upper +1.657 / lower +0.007 % chord | linear between the published points (UIUC coordinates) |
| y at x = 95 % chord | upper +0.904 / lower +0.101 % chord | linear between the published points (UIUC coordinates) |
| Coordinates source | UIUC Airfoil Coordinates Database: rg15.dat ('RG-15 8.9%') | UIUC Applied Aerodynamics Group (M. Selig) |

## Where the files are

- UIUC Applied Aerodynamics Group (M. Selig): [UIUC Airfoil Coordinates Database: rg15.dat ('RG-15 8.9%')](https://m-selig.ae.illinois.edu/ads/coord/rg15.dat) — 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: Rolf Girsberger (RG series))](https://m-selig.ae.illinois.edu/ads/coord_database.html) — web — UIUC Airfoil Coordinates Database, public research data; coordinates are facts, cited and linked, not rehosted

## Free STEP/STL (1 parts, Xem Studio Design License, Xem Studio)

Index: https://xemstudio.com/files/hardware/rg15-airfoil/index.json · license: https://xemstudio.com/files/hardware/rg15-airfoil/LICENSE.md

- rg15-airfoil-section-100mm-chord: [STEP](https://xemstudio.com/files/hardware/rg15-airfoil/rg15-airfoil-section-100mm-chord.step) · [STL](https://xemstudio.com/files/hardware/rg15-airfoil/rg15-airfoil-section-100mm-chord.stl) — RG15 section, 100 mm chord × 20 mm span, 61 points from the published coordinates, single trailing-edge point (scale to your chord)

## Questions

**How thick is the RG15?**

Maximum thickness 8.92 % of chord at 30.2 % chord: 8.92 mm on a 100 mm chord (computed from the UIUC coordinates).

**How much camber does the RG15 have?**

Maximum camber 1.76 % of chord at 39.7 % 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.

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