SD8020 symmetric airfoil — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/sd8020-airfoil/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)
Basis: Coordinates from the UIUC Airfoil Coordinates Database; thickness, camber and section by Xem Studio
Catalog version: 2026-10-20

Overall (mm): length 100.0, width 20.0, height 10.1
- 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.

parameter  value  source
Max thickness  10.10 % chord at 27.5 % chord  computed from the UIUC coordinates
Max camber  0 (symmetric)  computed from the UIUC coordinates
Published points  61 (31 upper, 31 lower, shared leading edge)  UIUC coordinates
Trailing edge as published  sharp (closed)  UIUC coordinates
y at x = 1.25 % chord  upper +1.448 / lower -1.447 % chord  linear between the published points (UIUC coordinates)
y at x = 2.5 % chord  upper +2.111 / lower -2.111 % chord  linear between the published points (UIUC coordinates)
y at x = 5 % chord  upper +2.964 / lower -2.964 % chord  linear between the published points (UIUC coordinates)
y at x = 7.5 % chord  upper +3.549 / lower -3.549 % chord  linear between the published points (UIUC coordinates)
y at x = 10 % chord  upper +3.977 / lower -3.977 % chord  linear between the published points (UIUC coordinates)
y at x = 15 % chord  upper +4.554 / lower -4.554 % chord  linear between the published points (UIUC coordinates)
y at x = 20 % chord  upper +4.863 / lower -4.863 % chord  linear between the published points (UIUC coordinates)
y at x = 25 % chord  upper +5.012 / lower -5.012 % chord  linear between the published points (UIUC coordinates)
y at x = 30 % chord  upper +5.042 / lower -5.042 % chord  linear between the published points (UIUC coordinates)
y at x = 40 % chord  upper +4.841 / lower -4.840 % chord  linear between the published points (UIUC coordinates)
y at x = 50 % chord  upper +4.383 / lower -4.383 % chord  linear between the published points (UIUC coordinates)
y at x = 60 % chord  upper +3.737 / lower -3.737 % chord  linear between the published points (UIUC coordinates)
y at x = 70 % chord  upper +2.946 / lower -2.946 % chord  linear between the published points (UIUC coordinates)
y at x = 80 % chord  upper +2.052 / lower -2.052 % chord  linear between the published points (UIUC coordinates)
y at x = 90 % chord  upper +1.100 / lower -1.100 % chord  linear between the published points (UIUC coordinates)
y at x = 95 % chord  upper +0.577 / lower -0.577 % chord  linear between the published points (UIUC coordinates)
Coordinates source  UIUC Airfoil Coordinates Database: sd8020.dat ('SD8020-010-88')  UIUC Applied Aerodynamics Group (M. Selig)

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- UIUC Applied Aerodynamics Group (M. Selig): UIUC Airfoil Coordinates Database: sd8020.dat ('SD8020-010-88') — web — UIUC Airfoil Coordinates Database, public research data; coordinates are facts, cited and linked, not rehosted — https://m-selig.ae.illinois.edu/ads/coord/sd8020.dat
- UIUC Applied Aerodynamics Group (M. Selig): UIUC Airfoil Coordinates Database (original: Michael Selig and John Donovan (SD series)) — web — UIUC Airfoil Coordinates Database, public research data; coordinates are facts, cited and linked, not rehosted — https://m-selig.ae.illinois.edu/ads/coord_database.html

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/sd8020-airfoil/index.json
API: https://xemstudio.com/api/geometry?object=sd8020-airfoil