Coupled ailerons and rudder — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/coupled-aileron-rudder/  (sheet CC BY 4.0)
Basis: Design rules and figures from the cited sources; example geometry by Xem Studio
Catalog version: 2026-10-20

Sizes: see table below
- Coupled controls link the rudder to the ailerons with interconnect springs, so aileron input also deflects the rudder to counter adverse yaw; the pilot can override the springs to slip (FAA PHAK ch.6).
- The rudder requirement is greatest at low airspeed, high AoA and large aileron deflection (FAA), which is why RC 'aileron-to-rudder mix' is popular on slow models.

parameter  value or range  source
Rudder demand peak  low speed, high AoA, large aileron  FAA PHAK ch.6

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

No true-size file yet: the published figures do not fix the whole shape; a measured scan is planned.
API: https://xemstudio.com/api/geometry?object=coupled-aileron-rudder