Aileron — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/aileron/  (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
- Ailerons on the outboard trailing edges move in opposite directions to roll the aircraft; the down-going aileron's drag yaws the nose away from the turn (adverse yaw), worst at low speed and large deflection (FAA PHAK ch.6).
- Sadraey's typical values: aileron area 5-10% of wing area, span 20-30% of wing span, chord 15-25% of wing chord, inboard edge at 60-80% semispan, max deflection about 30 deg, though he recommends keeping it under 25 deg to avoid aileron stall.
- A Cessna 182 uses 20% chord ailerons from 46% to 95% semispan with 20 deg up / 14 deg down (Sadraey Table 12.1).
- Used on: Cessna 182, Air Tractor AT-802, Gulfstream 200.
- 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
Sa/S  0.05-0.10  Sadraey ch.12
ba/b  0.20-0.30  Sadraey ch.12
Ca/C  0.15-0.25  Sadraey ch.12
Inboard edge bai/b  0.6-0.8  Sadraey ch.12
Max deflection  ~30 deg; keep < 25 deg up and down  Sadraey ch.12
Cessna 182  Ca/C 0.2, 0.46-0.95 semispan, 20/14 deg  Sadraey Table 12.1
Reference build  chord 200, 20% aileron, 300 mm long, 20 deg  Sadraey ranges

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
- Universidad de Sevilla course files (Sadraey, Aircraft Design, Ch. 12): Design of Control Surfaces (Aileron) — web — Publisher's page; dimensions are facts — https://aero.us.es/adesign/Slides/Extra/Stability/Design_Control_Surface/Chapter%2012.%20Desig%20of%20Control%20Surfaces%20%28Aileron%29.pdf

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