{ "version": "2026-10-20", "license": "Dimension sheets: CC BY 4.0. Standard and published-size files: CC BY 4.0. Xem Studio's own designs (files_license = Xem Studio Design License): free to use and sell things from, not to redistribute as files — https://xemstudio.com/license/. Other publishers' files: their own license, linked beside them.", "slug": "wing-fence", "name": "Wing fence", "kind": "standard", "category": "Aircraft design", "group": "Wing features", "year": null, "question": "What do wing fences do on swept wings?", "tags": [ "vehicle design", "wing features", "rc design", "aerodynamics" ], "aliases": [ "wing fence", "boundary layer fence", "stall fence", "wing fences swept wing", "mig-15 wing fence", "spanwise flow fence", "wing fence placement", "wing fence rc jet" ], "overall_mm": { "length": null, "width": null, "height": null }, "official_cad": false, "xem_status": "free-files", "les": false, "free_files": 1, "url": "https://xemstudio.com/objects/wing-fence/", "sheet_txt": "https://xemstudio.com/objects/wing-fence/sheet.txt", "sheet": { "basis": "Design rules and figures from the cited sources; example geometry by Xem Studio", "overall_mm": { "length": null, "width": null, "height": null }, "notes": [ "A wing fence is a chordwise plate on the upper surface that blocks spanwise boundary-layer flow toward the tips of a swept wing.", "NACA tests of a 45 deg swept wing found 'severe longitudinal instability' without fences; fences greatly increased the lift capacity of the outer sections, and five fences per panel brought the pitching moment close to linear except for a mild break at the stall (NACA RM A53I21).", "The best single fence location was 50% semispan (NACA).", "Used on: NACA 45 deg swept research wing.", "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." ], "table": { "columns": [ "parameter", "value or range", "source" ], "rows": [ [ "Test wing", "45 deg sweep, AR 5.515, taper 0.532, 10% thick", "NACA RM A53I21" ], [ "Best single fence", "0.50 semispan", "NACA RM A53I21" ], [ "Five-fence stations", "0.20, 0.35, 0.50, 0.65, 0.80 semispan", "NACA RM A53I21" ], [ "Reference build", "fence 100 mm chord on a 300 mm panel", "illustrative" ] ] } }, "sheet_text": "Wing fence — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/wing-fence/ (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)\nBasis: Design rules and figures from the cited sources; example geometry by Xem Studio\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A wing fence is a chordwise plate on the upper surface that blocks spanwise boundary-layer flow toward the tips of a swept wing.\n- NACA tests of a 45 deg swept wing found 'severe longitudinal instability' without fences; fences greatly increased the lift capacity of the outer sections, and five fences per panel brought the pitching moment close to linear except for a mild break at the stall (NACA RM A53I21).\n- The best single fence location was 50% semispan (NACA).\n- Used on: NACA 45 deg swept research wing.\n- 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.\n\nparameter value or range source\nTest wing 45 deg sweep, AR 5.515, taper 0.532, 10% thick NACA RM A53I21\nBest single fence 0.50 semispan NACA RM A53I21\nFive-fence stations 0.20, 0.35, 0.50, 0.65, 0.80 semispan NACA RM A53I21\nReference build fence 100 mm chord on a 300 mm panel illustrative\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- NACA Ames (Cleary & Boddy), RM A53I21: Wind-Tunnel Investigation of a 45 deg Sweptback Wing ... Including the Effects of Fences (1953) — web — Publisher's page; dimensions are facts — https://ntrs.nasa.gov/api/citations/19930088248/downloads/19930088248.pdf\n\nFree files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/wing-fence/index.json\nAPI: https://xemstudio.com/api/geometry?object=wing-fence\n", "sources": [ { "publisher": "NACA Ames (Cleary & Boddy), RM A53I21", "title": "Wind-Tunnel Investigation of a 45 deg Sweptback Wing ... Including the Effects of Fences (1953)", "url": "https://ntrs.nasa.gov/api/citations/19930088248/downloads/19930088248.pdf", "formats": [ "web" ], "license": "Publisher's page; dimensions are facts", "license_verified": true, "hosted": false } ], "xem": { "status": "free-files", "sheet_free": true, "mesh_price_usd": null, "step_price_usd": null, "tolerance_mm": null }, "related": [ "plain-flap", "split-flap", "slotted-flap", "fowler-flap", "leading-edge-slat-slot", "gurney-flap" ], "fits": [], "dimensions": "exact (nominal, no printing tolerance)", "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no printing tolerance. Where a part meets another part, the object lists its mating features (feature, exact size, what it mates with, fit class: press, slide, run, socket, clamp or designed). Apply your process's allowance to those features only; 'designed' gaps are part of the design and stay as drawn.", "mating": [], "faq": [ { "q": "Where should one fence go?", "a": "NACA found mid-semispan (0.50) best for a single fence on its 45 deg wing." } ], "files_license": { "name": "Xem Studio Design License", "holder": "Xem Studio", "url": "https://xemstudio.com/license/", "note": "Xem Studio's own design: free to use, print, modify and sell things made from it; not to be republished or redistributed as files." }, "offers": [ { "file": "wing-fence-wing-segment", "formats": [ "step", "stl" ], "price_usd": 0, "license": "Xem Studio Design License", "step": "https://xemstudio.com/files/hardware/wing-fence/wing-fence-wing-segment.step", "stl": "https://xemstudio.com/files/hardware/wing-fence/wing-fence-wing-segment.stl", "note": "Wing segment with a chordwise fence at mid-span (illustrative height)" } ], "markdown": "https://xemstudio.com/objects/wing-fence/index.md" }