NACA 0021 airfoil — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/naca-0021-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 21.0
- NACA 0021: symmetric, 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  1.250  3.314  1.250  -3.314
2.5  2.500  4.576  2.500  -4.576
5  5.000  6.221  5.000  -6.221
7.5  7.500  7.350  7.500  -7.350
10  10.000  8.195  10.000  -8.195
15  15.000  9.354  15.000  -9.354
20  20.000  10.040  20.000  -10.040
25  25.000  10.396  25.000  -10.396
30  30.000  10.501  30.000  -10.501
40  40.000  10.150  40.000  -10.150
50  50.000  9.251  50.000  -9.251
60  60.000  7.957  60.000  -7.957
70  70.000  6.359  70.000  -6.359
80  80.000  4.500  80.000  -4.500
90  90.000  2.389  90.000  -2.389
95  95.000  1.232  95.000  -1.232
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-0021-airfoil/index.json
API: https://xemstudio.com/api/geometry?object=naca-0021-airfoil