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Eppler E423 airfoil
What is the exact shape of the Eppler E423 airfoil? · Standard part · basis: Coordinates from the UIUC Airfoil Coordinates Database; thickness, camber and section by Xem Studio
Also called: e423, eppler 423, Eppler E423 coordinates, Eppler E423 dat, Eppler E423 STEP, Eppler E423 STL, Eppler E423 profile
Exact dimensions. True size, with no printing tolerance added.
- length
- 100.0 mm
- width
- 20.0 mm
- height
- 12.52 mm
Notes
- Eppler E423: Richard Eppler (Eppler airfoil series). Maximum thickness 12.52 % of chord at 24.0 % chord; maximum camber 10.03 % of chord at 44.9 % chord.
- Coordinates from the UIUC Airfoil Coordinates Database (M. Selig, UIUC Applied Aerodynamics Group), file e423.dat, titled 'E423'. 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.
Eppler E423 airfoil size chart
| parameter | value | source |
|---|---|---|
| Max thickness | 12.52 % chord at 24.0 % chord | computed from the UIUC coordinates |
| Max camber | 10.03 % chord at 44.9 % chord | computed from the UIUC coordinates |
| Published points | 72 (35 upper, 38 lower, shared leading edge) | UIUC coordinates |
| Trailing edge as published | sharp (closed) | UIUC coordinates |
| y at x = 1.25 % chord | upper +3.399 / lower -1.232 % chord | linear between the published points (UIUC coordinates) |
| y at x = 2.5 % chord | upper +4.885 / lower -1.429 % chord | linear between the published points (UIUC coordinates) |
| y at x = 5 % chord | upper +7.012 / lower -1.477 % chord | linear between the published points (UIUC coordinates) |
| y at x = 7.5 % chord | upper +8.653 / lower -1.239 % chord | linear between the published points (UIUC coordinates) |
| y at x = 10 % chord | upper +9.982 / lower -0.846 % chord | linear between the published points (UIUC coordinates) |
| y at x = 15 % chord | upper +12.045 / lower +0.129 % chord | linear between the published points (UIUC coordinates) |
| y at x = 20 % chord | upper +13.576 / lower +1.176 % chord | linear between the published points (UIUC coordinates) |
| y at x = 25 % chord | upper +14.655 / lower +2.140 % chord | linear between the published points (UIUC coordinates) |
| y at x = 30 % chord | upper +15.373 / lower +2.976 % chord | linear between the published points (UIUC coordinates) |
| y at x = 40 % chord | upper +15.828 / lower +4.146 % chord | linear between the published points (UIUC coordinates) |
| y at x = 50 % chord | upper +15.015 / lower +4.671 % chord | linear between the published points (UIUC coordinates) |
| y at x = 60 % chord | upper +13.190 / lower +4.719 % chord | linear between the published points (UIUC coordinates) |
| y at x = 70 % chord | upper +10.768 / lower +4.287 % chord | linear between the published points (UIUC coordinates) |
| y at x = 80 % chord | upper +7.933 / lower +3.381 % chord | linear between the published points (UIUC coordinates) |
| y at x = 90 % chord | upper +4.659 / lower +2.004 % chord | linear between the published points (UIUC coordinates) |
| y at x = 95 % chord | upper +2.624 / lower +1.125 % chord | linear between the published points (UIUC coordinates) |
| Coordinates source | UIUC Airfoil Coordinates Database: e423.dat ('E423') | 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: e423.dat ('E423') | 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: Richard Eppler (Eppler airfoil 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
| eppler-e423-airfoil-section-100mm-chord | Eppler E423 section, 100 mm chord × 20 mm span, 71 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=eppler-e423-airfoil
Fits with
Questions
How thick is the Eppler E423?
Maximum thickness 12.52 % of chord at 24.0 % chord: 12.52 mm on a 100 mm chord (computed from the UIUC coordinates).
How much camber does the Eppler E423 have?
Maximum camber 10.03 % of chord at 44.9 % 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.