Eppler E423 airfoil — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/eppler-e423-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 12.52
- Eppler E423: Richard Eppler (Eppler airfoil series). Maximum thickness 12.52 % of chord at 24.0 % chord; maximum camber 10.03 % of chord at 44.9 % chord.
- Coordinates from the UIUC Airfoil Coordinates Database (M. Selig, UIUC Applied Aerodynamics Group), file e423.dat, titled 'E423'. 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  12.52 % chord at 24.0 % chord  computed from the UIUC coordinates
Max camber  10.03 % chord at 44.9 % chord  computed from the UIUC coordinates
Published points  72 (35 upper, 38 lower, shared leading edge)  UIUC coordinates
Trailing edge as published  sharp (closed)  UIUC coordinates
y at x = 1.25 % chord  upper +3.399 / lower -1.232 % chord  linear between the published points (UIUC coordinates)
y at x = 2.5 % chord  upper +4.885 / lower -1.429 % chord  linear between the published points (UIUC coordinates)
y at x = 5 % chord  upper +7.012 / lower -1.477 % chord  linear between the published points (UIUC coordinates)
y at x = 7.5 % chord  upper +8.653 / lower -1.239 % chord  linear between the published points (UIUC coordinates)
y at x = 10 % chord  upper +9.982 / lower -0.846 % chord  linear between the published points (UIUC coordinates)
y at x = 15 % chord  upper +12.045 / lower +0.129 % chord  linear between the published points (UIUC coordinates)
y at x = 20 % chord  upper +13.576 / lower +1.176 % chord  linear between the published points (UIUC coordinates)
y at x = 25 % chord  upper +14.655 / lower +2.140 % chord  linear between the published points (UIUC coordinates)
y at x = 30 % chord  upper +15.373 / lower +2.976 % chord  linear between the published points (UIUC coordinates)
y at x = 40 % chord  upper +15.828 / lower +4.146 % chord  linear between the published points (UIUC coordinates)
y at x = 50 % chord  upper +15.015 / lower +4.671 % chord  linear between the published points (UIUC coordinates)
y at x = 60 % chord  upper +13.190 / lower +4.719 % chord  linear between the published points (UIUC coordinates)
y at x = 70 % chord  upper +10.768 / lower +4.287 % chord  linear between the published points (UIUC coordinates)
y at x = 80 % chord  upper +7.933 / lower +3.381 % chord  linear between the published points (UIUC coordinates)
y at x = 90 % chord  upper +4.659 / lower +2.004 % chord  linear between the published points (UIUC coordinates)
y at x = 95 % chord  upper +2.624 / lower +1.125 % chord  linear between the published points (UIUC coordinates)
Coordinates source  UIUC Airfoil Coordinates Database: e423.dat ('E423')  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: e423.dat ('E423') — web — UIUC Airfoil Coordinates Database, public research data; coordinates are facts, cited and linked, not rehosted — https://m-selig.ae.illinois.edu/ads/coord/e423.dat
- UIUC Applied Aerodynamics Group (M. Selig): UIUC Airfoil Coordinates Database (original: Richard Eppler (Eppler airfoil 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/eppler-e423-airfoil/index.json
API: https://xemstudio.com/api/geometry?object=eppler-e423-airfoil