Servos & Simulation is a  designer, manufacturer, and integrator of precision motion control products and systems.

Feedback Control Loader System Software


Servos and Simulation engineers have designed and written software for the control loaders that accurately models the flight controls in many aircraft.  Among these aircraft are listed below.


The software contains an precision math model of the flight control system.  All the models are similar but, are specific for each 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 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 connected mechanically or in software to the flight controls in the aft cockpit.


Variables which are returned to the host computer:

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


Control Loader Aircraft Types that Servos and Simulation has experience with:


Fixed Wing Aircraft:


Embraer EMB-120

Beechcraft King Air

Boeing 737 Loft

Boeing 737 JTS


Cessna T-37

Cessna T-38 Talon

Beechcraft King Air C-90

Boeing KC-135 Stratotanker

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




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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105 Commerce Street Suite 101

Lake Mary, FL 32746


Servos & Simulation is a  designer, manufacturer, and integrator of precision motion control products and systems.