HT08 airfoil (Drela tail section) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/ht08-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 5.0
- HT08: Mark Drela (HT tail series). Maximum thickness 5.00 % of chord at 20.2 % chord; symmetric (no camber).
- Coordinates from the UIUC Airfoil Coordinates Database (M. Selig, UIUC Applied Aerodynamics Group), file ht08.dat, titled 'HT08'. Thickness and camber are computed by Xem Studio from those points (vertical distance at equal x, linear between points).
- The published trailing edge is open (0.347 % chord thick). As on the NACA pages, the file uses a single sharp trailing-edge point: each surface is shifted linearly from zero at the leading edge to meet at the mid point of the published trailing edge, a change of at most 0.174 % chord, at the trailing edge itself.
- 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  5.00 % chord at 20.2 % chord  computed from the UIUC coordinates
Max camber  0 (symmetric)  computed from the UIUC coordinates
Published points  160 (80 upper, 81 lower, shared leading edge)  UIUC coordinates
Trailing edge as published  open, 0.347 % chord thick  UIUC coordinates
y at x = 1.25 % chord  upper +1.060 / lower -1.057 % chord  linear between the published points (UIUC coordinates)
y at x = 2.5 % chord  upper +1.421 / lower -1.419 % chord  linear between the published points (UIUC coordinates)
y at x = 5 % chord  upper +1.853 / lower -1.851 % chord  linear between the published points (UIUC coordinates)
y at x = 7.5 % chord  upper +2.110 / lower -2.107 % chord  linear between the published points (UIUC coordinates)
y at x = 10 % chord  upper +2.275 / lower -2.272 % chord  linear between the published points (UIUC coordinates)
y at x = 15 % chord  upper +2.449 / lower -2.447 % chord  linear between the published points (UIUC coordinates)
y at x = 20 % chord  upper +2.500 / lower -2.498 % chord  linear between the published points (UIUC coordinates)
y at x = 25 % chord  upper +2.478 / lower -2.476 % chord  linear between the published points (UIUC coordinates)
y at x = 30 % chord  upper +2.411 / lower -2.409 % chord  linear between the published points (UIUC coordinates)
y at x = 40 % chord  upper +2.200 / lower -2.199 % chord  linear between the published points (UIUC coordinates)
y at x = 50 % chord  upper +1.937 / lower -1.936 % chord  linear between the published points (UIUC coordinates)
y at x = 60 % chord  upper +1.640 / lower -1.639 % chord  linear between the published points (UIUC coordinates)
y at x = 70 % chord  upper +1.313 / lower -1.312 % chord  linear between the published points (UIUC coordinates)
y at x = 80 % chord  upper +0.959 / lower -0.959 % chord  linear between the published points (UIUC coordinates)
y at x = 90 % chord  upper +0.582 / lower -0.582 % chord  linear between the published points (UIUC coordinates)
y at x = 95 % chord  upper +0.382 / lower -0.382 % chord  linear between the published points (UIUC coordinates)
Coordinates source  UIUC Airfoil Coordinates Database: ht08.dat ('HT08')  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: ht08.dat ('HT08') — web — UIUC Airfoil Coordinates Database, public research data; coordinates are facts, cited and linked, not rehosted — https://m-selig.ae.illinois.edu/ads/coord/ht08.dat
- UIUC Applied Aerodynamics Group (M. Selig): UIUC Airfoil Coordinates Database (original: Mark Drela (HT tail 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/ht08-airfoil/index.json
API: https://xemstudio.com/api/geometry?object=ht08-airfoil