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Leading-edge slat and fixed slot
How do slats and slots delay the stall? · Standard part · basis: Design rules and figures from the cited sources; example geometry by Xem Studio
Also called: leading edge slat, slats, fixed slot, wing slot, handley page slot, slat vs slot, krueger flap, leading edge flap, stol slats rc, automatic slats
Exact dimensions. True size, with no printing tolerance added.
- sizes
- 5 in table
Notes
- 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.
Leading-edge slat and fixed slot size chart
| 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 |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| FAA | Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25), Ch. 6 Flight Controls | web | Publisher's page; dimensions are facts |
| 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 |
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
| leading-edge-slat-slot-wing-segment | Wing segment with a deployed leading-edge slat (gap and angle illustrative) | STEP · STL |
https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.Plain text: sheet.txt · JSON: /api/geometry?object=leading-edge-slat-slot
Fits with
Questions
Slot or slat for a STOL RC plane?
A fixed slot is simplest (dCLmax ~0.2); a slat extending the chord gives more (~0.4 c'/c) (Arnedo).