Control Loader Math Model Software for Aircraft

Servos & Simulation has designed and written software for the feedback control loader systems that accurately model the flight controls for many aircraft.  The software contains a precision math model of the flight control system for the specified aircraft. See the list below for a comprehensive list of aircraft. The models typically include the following:

Feel Spring, Breakout, Stops, Friction, Damping, Force Trim (helicopters), Beep trim (typically fixed-wing aircraft), Stick Shaker, Stick Pusher, Coupling between Axes, Autopilot, Boost actuators with hydraulic failure modes, Aerodynamic forces on the control surfaces, Trim tab, Servo tab operation, Separable aileron controls (wheels), Separable elevator controls (column), Boost failure modes usually include manual reversion so the aircraft is still flyable

Separable aileron controls and elevator controls require a separate control loader actuator for each wheel or column.  The two-wheel control loaders are connected and disconnected in software.  This is the same for the two-column control loaders.

An aircraft with fore and aft cockpits such as the Apache may have the flight controls in the forward cockpit can be connected mechanically or in software to the flight controls in the aft cockpit.

Variables that are returned to the host computer include but are not limited to:

  • Flight control roll angle (wheel or stick)
  • Flight control pitch angle (column or stick)
  • Flight control pedal position
  • Flight control collective stick position (helicopters only)
  • Aileron angle
  • Elevator angle
  • Rudder angle
  • Others available upon request

Fixed Wing Aircraft Experience

Embraer EMB-120

Beechcraft King Air

Boeing 737 Loft

Boeing 737 JTS


Cessna T-37

Cessna T-38 Talon

Beechcraft King Air C-90

Beechcraft Baron

Northrop F-5 Tiger

Piper Cheyenne Pa-42

Boeing C-17 Globemaster

Lockheed C-141 Starlifter

Cessna 421

Beechcraft Super King Air B200

Douglas A-1 Skyraider

Boeing B-52 Stratofortress


Beechcraft T-34 Mentor

McDonnell Douglas AV-8B Harrier II

Bombardier CL-415 Water Bomber

McDonnell Douglas DC-9


Cessna Ironbird Jet

Bombardier CRJ (Canadian Regional Jet)

McDonnell Douglas F-15 Eagle

Dornier 328

Northrop Grumman EA-6B Prowler

Beechcraft C-12 Huron

Lockheed C-130 Hercules

Lockheed F117 Nighthawk

Boeing KC-135 Stratotanker

Rotary Wing - Helicopter Experience

Robinson R-44

Airbus HH-65 Dolphin

Sikorsky MH-60 / SH-60 Seahawk

Bell B212

Bell UH-1N Twin Huey

Boeing AH-64 Apache

Boeing AH-64 Apache Longbow

Sikorsky MH-53 Pave Low

Boeing CH-47 Chinook

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