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AG25 airfoil (Drela AG series)

Name: AG25 airfoil (Drela AG series) dimension sheet
Creator: Xem Studio
License: https://creativecommons.org/licenses/by/4.0/

What is the exact shape of the AG25 airfoil? · Standard part · basis: Coordinates from the UIUC Airfoil Coordinates Database; thickness, camber and section by Xem Studio

Also called: ag25, drela ag25, AG25 airfoil, AG25 coordinates, AG25 dat, AG25 STEP, AG25 STL, AG25 profile

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

length: 100.0 mm
width: 20.0 mm
height: 7.58 mm

Notes

AG25: Mark Drela (AG series; UIUC file titled 'AG25 Bubble Dancer DLG by Mark Drela'). Maximum thickness 7.58 % of chord at 24.7 % chord; maximum camber 2.40 % of chord at 45.4 % chord.
Coordinates from the UIUC Airfoil Coordinates Database (M. Selig, UIUC Applied Aerodynamics Group), file ag25.dat, titled 'AG25 Bubble Dancer DLG by Mark Drela'. 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 (0.096 % 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 0.048 % 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.

AG25 airfoil size chart

parameter	value	source
Max thickness	7.58 % chord at 24.7 % chord	computed from the UIUC coordinates
Max camber	2.40 % chord at 45.4 % chord	computed from the UIUC coordinates
Published points	160 (81 upper, 80 lower, shared leading edge)	UIUC coordinates
Trailing edge as published	open, 0.096 % chord thick	UIUC coordinates
y at x = 1.25 % chord	upper +1.438 / lower -0.876 % chord	linear between the published points (UIUC coordinates)
y at x = 2.5 % chord	upper +2.160 / lower -1.183 % chord	linear between the published points (UIUC coordinates)
y at x = 5 % chord	upper +3.157 / lower -1.542 % chord	linear between the published points (UIUC coordinates)
y at x = 7.5 % chord	upper +3.864 / lower -1.741 % chord	linear between the published points (UIUC coordinates)
y at x = 10 % chord	upper +4.402 / lower -1.852 % chord	linear between the published points (UIUC coordinates)
y at x = 15 % chord	upper +5.150 / lower -1.921 % chord	linear between the published points (UIUC coordinates)
y at x = 20 % chord	upper +5.606 / lower -1.860 % chord	linear between the published points (UIUC coordinates)
y at x = 25 % chord	upper +5.861 / lower -1.720 % chord	linear between the published points (UIUC coordinates)
y at x = 30 % chord	upper +5.965 / lower -1.530 % chord	linear between the published points (UIUC coordinates)
y at x = 40 % chord	upper +5.835 / lower -1.075 % chord	linear between the published points (UIUC coordinates)
y at x = 50 % chord	upper +5.369 / lower -0.607 % chord	linear between the published points (UIUC coordinates)
y at x = 60 % chord	upper +4.643 / lower -0.194 % chord	linear between the published points (UIUC coordinates)
y at x = 70 % chord	upper +3.703 / lower +0.118 % chord	linear between the published points (UIUC coordinates)
y at x = 80 % chord	upper +2.593 / lower +0.301 % chord	linear between the published points (UIUC coordinates)
y at x = 90 % chord	upper +1.354 / lower +0.284 % chord	linear between the published points (UIUC coordinates)
y at x = 95 % chord	upper +0.691 / lower +0.154 % chord	linear between the published points (UIUC coordinates)
Coordinates source	UIUC Airfoil Coordinates Database: ag25.dat ('AG25 Bubble Dancer DLG by Mark Drela')	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: ag25.dat ('AG25 Bubble Dancer DLG by Mark Drela')	web	UIUC 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: Mark Drela (AG series; UIUC file titled 'AG25 Bubble Dancer DLG by Mark Drela'))	web	UIUC 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

ag25-airfoil-section-100mm-chord

AG25 section, 100 mm chord × 20 mm span, 159 points from the published coordinates, single trailing-edge point (scale to your chord)

STEP · STL

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Plain text: sheet.txt · JSON: /api/geometry?object=ag25-airfoil

AG25 airfoil (Drela AG series), isometric render of a generated part — Render of ag25-airfoil-section-100mm-chord from the free STEP; not to scale.

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Questions

How thick is the AG25?

Maximum thickness 7.58 % of chord at 24.7 % chord: 7.58 mm on a 100 mm chord (computed from the UIUC coordinates).

How much camber does the AG25 have?

Maximum camber 2.40 % of chord at 45.4 % chord (computed from the UIUC coordinates).

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.