Leading-edge cuff (drooped leading edge) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/leading-edge-cuff/  (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
- A cuff extends the leading edge down and forward, lowering stall speed at a cruise-speed penalty (FAA PHAK ch.6).
- On NASA's canard GA model an outboard droop of about 6% chord extension and 3% camber over the outer 25% of span stopped premature tip stall, increased roll damping and eliminated wing rock; without it roll damping went unstable near 16 deg (NASA TP-2623).
- The reported cruise drag penalty was 0.0040 (NASA TP-2623, citing reference data).
- Used on: NASA canard GA model (TP-2623).
- 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
Outboard droop geometry  ~6% chord extension, ~3% camber, outer 25% span  NASA TP-2623
Roll damping without droop  unstable at ~16 deg AoA  NASA TP-2623
Cruise drag penalty  0.0040  NASA TP-2623
Reference build  chord 100, 6% extension on 25% of a 1200 span  NASA TP-2623

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
- NASA Langley (D. Satran): Wind-Tunnel Investigation of the Flight Characteristics of a Canard General-Aviation Airplane Configuration, NASA TP-2623 (1986) — web — Publisher's page; dimensions are facts — https://ntrs.nasa.gov/api/citations/19870000606/downloads/19870000606.pdf

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