Differential ailerons — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/differential-ailerons/  (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
- Differential ailerons deflect the up-going aileron farther than the down-going one, adding drag on the descending wing; adverse yaw is reduced but not eliminated (FAA PHAK ch.6).
- Sadraey notes Piper aircraft generally use differential ailerons; a Cessna 182's 20 up / 14 down and a 777's 30 up / 10 down show the asymmetry (Sadraey Table 12.1).
- Used on: Cessna 182, Boeing 777-200, Piper aircraft (generally).
- 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
Cessna 182 up/down  20 / 14 deg  Sadraey Table 12.1
Boeing 777-200 up/down  30 / 10 deg  Sadraey Table 12.1
Air Tractor AT-802 up/down  17 / 13 deg  Sadraey Table 12.1
Reference build  chord 200, 20% aileron, 20 deg up  Cessna 182 ratio

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/differential-ailerons/index.json
API: https://xemstudio.com/api/geometry?object=differential-ailerons