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SD8020 symmetric airfoil

What is the exact shape of the SD8020 symmetric airfoil? · Standard part · basis: Coordinates from the UIUC Airfoil Coordinates Database; thickness, camber and section by Xem Studio

Also called: sd8020, sd8020-010-88, SD8020 symmetric coordinates, SD8020 symmetric dat, SD8020 symmetric STEP, SD8020 symmetric STL, SD8020 symmetric profile

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

length
100.0 mm
width
20.0 mm
height
10.1 mm

Notes

  • SD8020 symmetric: Michael Selig and John Donovan (SD series). Maximum thickness 10.10 % of chord at 27.5 % chord; symmetric (no camber).
  • Coordinates from the UIUC Airfoil Coordinates Database (M. Selig, UIUC Applied Aerodynamics Group), file sd8020.dat, titled 'SD8020-010-88'. 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.

SD8020 symmetric airfoil size chart

parametervaluesource
Max thickness10.10 % chord at 27.5 % chordcomputed from the UIUC coordinates
Max camber0 (symmetric)computed from the UIUC coordinates
Published points61 (31 upper, 31 lower, shared leading edge)UIUC coordinates
Trailing edge as publishedsharp (closed)UIUC coordinates
y at x = 1.25 % chordupper +1.448 / lower -1.447 % chordlinear between the published points (UIUC coordinates)
y at x = 2.5 % chordupper +2.111 / lower -2.111 % chordlinear between the published points (UIUC coordinates)
y at x = 5 % chordupper +2.964 / lower -2.964 % chordlinear between the published points (UIUC coordinates)
y at x = 7.5 % chordupper +3.549 / lower -3.549 % chordlinear between the published points (UIUC coordinates)
y at x = 10 % chordupper +3.977 / lower -3.977 % chordlinear between the published points (UIUC coordinates)
y at x = 15 % chordupper +4.554 / lower -4.554 % chordlinear between the published points (UIUC coordinates)
y at x = 20 % chordupper +4.863 / lower -4.863 % chordlinear between the published points (UIUC coordinates)
y at x = 25 % chordupper +5.012 / lower -5.012 % chordlinear between the published points (UIUC coordinates)
y at x = 30 % chordupper +5.042 / lower -5.042 % chordlinear between the published points (UIUC coordinates)
y at x = 40 % chordupper +4.841 / lower -4.840 % chordlinear between the published points (UIUC coordinates)
y at x = 50 % chordupper +4.383 / lower -4.383 % chordlinear between the published points (UIUC coordinates)
y at x = 60 % chordupper +3.737 / lower -3.737 % chordlinear between the published points (UIUC coordinates)
y at x = 70 % chordupper +2.946 / lower -2.946 % chordlinear between the published points (UIUC coordinates)
y at x = 80 % chordupper +2.052 / lower -2.052 % chordlinear between the published points (UIUC coordinates)
y at x = 90 % chordupper +1.100 / lower -1.100 % chordlinear between the published points (UIUC coordinates)
y at x = 95 % chordupper +0.577 / lower -0.577 % chordlinear between the published points (UIUC coordinates)
Coordinates sourceUIUC Airfoil Coordinates Database: sd8020.dat ('SD8020-010-88')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: sd8020.dat ('SD8020-010-88')webUIUC 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: Michael Selig and John Donovan (SD series))webUIUC 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

sd8020-airfoil-section-100mm-chordSD8020 symmetric section, 100 mm chord × 20 mm span, 60 points from the published coordinates, single trailing-edge point (scale to your chord)STEP · STL
Let your AI pull this. Add 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.
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Plain text: sheet.txt · JSON: /api/geometry?object=sd8020-airfoil

SD8020 symmetric airfoil, isometric render of a generated part
Render of sd8020-airfoil-section-100mm-chord from the free STEP; not to scale.

Fits with

Clark Y airfoil, isometric render of a generated part
Clark Y airfoil100.0×20.0×11.71 mm★ 1 file
Eppler E387 airfoil, isometric render of a generated part
Eppler E387 airfoil100.0×20.0×9.07 mm★ 1 file
MH 32 airfoil, isometric render of a generated part
MH 32 airfoil100.0×20.0×8.7 mm★ 1 file
AG35 airfoil (Drela AG series), isometric render of a generated part
AG35 airfoil (Drela AG series)100.0×20.0×8.72 mm★ 1 file
Selig S7075 airfoil, isometric render of a generated part
Selig S7075 airfoil100.0×20.0×9.0 mm★ 1 file
SD7037 airfoil, isometric render of a generated part
SD7037 airfoil100.0×20.0×9.2 mm★ 1 file
NACA 2412 airfoil, isometric render of a generated part
NACA 2412 airfoil100.0×20.0×12.0 mm★ 1 file
NACA 0012 airfoil, isometric render of a generated part
NACA 0012 airfoil100.0×20.0×12.0 mm★ 1 file

Questions

How thick is the SD8020 symmetric?

Maximum thickness 10.10 % of chord at 27.5 % chord: 10.10 mm on a 100 mm chord (computed from the UIUC coordinates).

How much camber does the SD8020 symmetric have?

None: it is symmetric.

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.