Leading-edge slat and fixed slot — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/leading-edge-slat-slot/  (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
- Fixed slots duct air to the upper surface to delay separation at high angle of attack; movable slats are leading-edge segments on tracks (FAA PHAK ch.6). Leading-edge flaps raise CLmax and reduce the nose-down moment of trailing-edge flaps (FAA).
- Section CLmax increments: fixed slot about 0.2, Krueger/drop flap about 0.3, slat about 0.4 x c'/c (Arnedo, Franchini data). Triple-slotted flaps with slats reach CLmax/cos(sweep) of 3.2-3.5 for landing (Arnedo).
- 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
Fixed slot dCLmax  0.2  Arnedo (Franchini)
Krueger / drop flap dCLmax  0.3  Arnedo
Slat dCLmax  0.4 c'/c  Arnedo
Triple slotted flap + slat, wing CLmax/cos  2.4-2.7 takeoff / 3.2-3.5 landing  Arnedo
Reference build  chord 100, 15% slat, 20 deg  illustrative

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- FAA: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25), Ch. 6 Flight Controls — web — Publisher's page; dimensions are facts — https://www.faa.gov/sites/faa.gov/files/08_phak_ch6.pdf
- LibreTexts (Arnedo, Fundamentals of Aerospace Engineering; data from Franchini et al.): 3.4.3 Increase in CLmax (high-lift devices) — web — Publisher's page; dimensions are facts — https://eng.libretexts.org/Bookshelves/Aerospace_Engineering/Fundamentals_of_Aerospace_Engineering_(Arnedo)/03%3A_Aerodynamics/3.04%3A_High-lift_devices/3.4.03%3A_Increase_in_CLmax

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