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NACA 2418 airfoil
What is the exact shape of the NACA 2418 airfoil, and what do the digits mean? · Standard part · basis: Computed from the NACA equations (Report 460 / Report 610, restated in NASA TM-4741)
Also called: NACA 2418, NACA 2418 coordinates, NACA 2418 dat, NACA 2418 profile, NACA 2418 DXF, NACA 2418 STEP, NACA 2418 STL, perfil NACA 2418, Profil NACA 2418, naca2418, NACA 2418 wing section
Exact dimensions. True size, with no printing tolerance added.
- length
- 100.0 mm
- width
- 20.0 mm
- height
- 18.0 mm
Notes
- NACA 2418: 2 % camber at 40 % chord, 18 % thick.
- NACA 4-digit: first digit = maximum camber in % of chord, second = its position in tenths of chord, last two = maximum thickness in % of chord (NACA Report 460).
- Ordinates are in % of chord from the leading edge, computed from the published equations with the closed-trailing-edge thickness coefficient (−0.1036, as in NASA TM-4741). The original reports use an open trailing edge (−0.1015); the difference is under 0.03 % of chord near the trailing edge.
- 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.
NACA 2418 airfoil size chart
| x (% chord) | upper x | upper y | lower x | lower y |
|---|---|---|---|---|
| 0 | 0.000 | 0.000 | 0.000 | 0.000 |
| 1.25 | 0.976 | 2.951 | 1.524 | -2.705 |
| 2.5 | 2.134 | 4.147 | 2.866 | -3.663 |
| 5 | 4.535 | 5.780 | 5.465 | -4.843 |
| 7.5 | 6.990 | 6.959 | 8.010 | -5.599 |
| 10 | 9.475 | 7.879 | 10.525 | -6.129 |
| 15 | 14.500 | 9.221 | 15.500 | -6.783 |
| 20 | 19.570 | 10.095 | 20.430 | -7.095 |
| 25 | 24.666 | 10.624 | 25.334 | -7.186 |
| 30 | 29.775 | 10.873 | 30.225 | -7.123 |
| 40 | 40.000 | 10.700 | 40.000 | -6.700 |
| 50 | 50.088 | 9.873 | 49.912 | -5.984 |
| 60 | 60.152 | 8.597 | 59.848 | -5.041 |
| 70 | 70.182 | 6.947 | 69.818 | -3.947 |
| 80 | 80.171 | 4.965 | 79.829 | -2.742 |
| 90 | 90.114 | 2.656 | 89.886 | -1.433 |
| 95 | 95.064 | 1.373 | 94.936 | -0.734 |
| 100 | 100.000 | -0.000 | 100.000 | 0.000 |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| NACA (NASA Technical Reports Server) | Report 460: The characteristics of 78 related airfoil sections from tests in the variable-density wind tunnel (Jacobs, Ward, Pinkerton, 1933) | web | Publisher's page; dimensions are facts |
| NASA | TM-4741: Computer program to obtain ordinates for NACA airfoils (Ladson, Brooks, Hill, Sproles, 1996) | web | Publisher's page; dimensions are facts |
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
| naca-2418-airfoil-section-100mm-chord | NACA 2418 section, 100 mm chord × 20 mm span, closed trailing edge, 160 points from the equations (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=naca-2418-airfoil
Fits with
Questions
How thick is the NACA 2418?
Maximum thickness 18.00 % of chord at 30.0 % chord: 18.00 mm on a 100 mm chord.
Where is the NACA 2418's camber?
Maximum camber 2.00 % of chord at 40.0 % chord.
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.