NACA 4421 airfoil — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/naca-4421-airfoil/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)
Basis: Computed from the NACA equations (Report 460 / Report 610, restated in NASA TM-4741)
Catalog version: 2026-10-20

Overall (mm): length 100.0, width 20.0, height 20.98
- NACA 4421: 4 % camber at 40 % chord, 21 % 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.

x (% chord)  upper x  upper y  lower x  lower y
0  0.000  0.000  0.000  0.000
1.25  0.620  3.500  1.880  -3.008
2.5  1.657  4.982  3.343  -4.013
5  3.928  7.065  6.072  -5.190
7.5  6.321  8.614  8.679  -5.895
10  8.784  9.854  11.216  -6.354
15  13.840  11.719  16.160  -6.844
20  19.001  12.991  20.999  -6.991
25  24.222  13.805  25.778  -6.930
30  29.476  14.238  30.524  -6.738
40  40.000  14.150  40.000  -6.150
50  50.206  13.137  49.794  -5.360
60  60.353  11.505  59.647  -4.394
70  70.423  9.345  69.577  -3.345
80  80.398  6.705  79.602  -2.260
90  90.264  3.596  89.736  -1.152
95  95.149  1.862  94.851  -0.584
100  100.000  -0.000  100.000  0.000

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- 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 — https://ntrs.nasa.gov/citations/19930091108
- NASA: TM-4741: Computer program to obtain ordinates for NACA airfoils (Ladson, Brooks, Hill, Sproles, 1996) — web — Publisher's page; dimensions are facts — https://www.pdas.com/refs/tm4741.pdf

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/naca-4421-airfoil/index.json
API: https://xemstudio.com/api/geometry?object=naca-4421-airfoil