Forward-swept wing — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/forward-swept-wing/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)
Basis: Design rules and figures from the cited sources; example geometry by Xem Studio
Catalog version: 2026-10-20

Sizes: see table below
- Leishman describes forward sweep as aeroelastically unstable and rarely used, because aerodynamic load twists the tips to higher incidence (ERAU).
- NASA's X-29 used composite aeroelastic tailoring, letting the wing bend but limiting twist to prevent divergence; reversed spanwise flow kept the tips and ailerons from stalling at high angle of attack, with good control to 45 deg (NASA FS-008).
- Forward sweep gives an unstable dihedral effect, so it needs more geometric dihedral than straight or swept-back wings (Kitplanes, Wainfan). The X-29 did not show the drag reduction earlier studies predicted (NASA).
- Used on: Grumman X-29.
- The file is a reference example built by Xem Studio from the numbers above. Sizes the sources do not fix are illustrative; scale the example to your own vehicle.

parameter  value or range  source
X-29 span / length  27.2 ft / 48.1 ft  NASA FS-008
X-29 controllable AoA  excellent to 45 deg; limited at 67 deg  NASA FS-008
X-29 wash  washin toward tip (forward-swept)  ERAU (Leishman)
Reference build sweep  -30 deg LE (illustrative; no published angle fetched)  illustrative

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Embry-Riddle (Leishman), Introduction to Aerospace Flight Vehicles: Wing Shapes and Nomenclature — web — Publisher's page; dimensions are facts — https://eaglepubs.erau.edu/introductiontoaerospaceflightvehicles/chapter/wing-shapes-and-nomenclature/
- NASA Armstrong: X-29 Fact Sheet FS-008 — web — Publisher's page; dimensions are facts — https://www.nasa.gov/wp-content/uploads/2021/09/fs-008-afrc.pdf
- Kitplanes (B. Wainfan): Wind Tunnel: Roll's role in lateral stability (2008) — web — Publisher's page; dimensions are facts — https://www.kitplanes.com/wind-tunnel-135/

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