Help with actuator model

Hello All,

I am working in a project of UAV
In this project we have a piloted step before the flight was automatic and we are using FlightGear as a training tool for the pilot. We would like to add to our aircraft model (Jsbsim model) the behaviour of the actuators and I have read in http://jsbsim.wiki.sourceforge.net/JSBSim+Users+Manual the following information:

'' Actuator Component''
Encapsulates an Actuator component for the flight control system. The actuator can be modeled as a "perfect actuator", with the Output being set directly to the input. The actuator can be made more "real" by specifying any/all of the following additional effects that can be applied to the actuator. In order of application to the input signal, these are:

*System lag (input lag, really)
*Rate limiting
*Deadband
*Hysteresis (mechanical hysteresis)
*Bias (mechanical bias)
*Position limiting ("hard stops")

There are also several malfunctions that can be applied to the actuator by setting a property to true or false (or 1 or 0).
Syntax:

<actuator name="name">
<input> {[-]property} </input>
<lag> number </lag>
<rate_limit> number <rate_limit>
<bias> number </bias>
<deadband_width> number </deadband_width>
<hysteresis_width> number </hysteresis_width>
[<clipto>
<min> {property name | value} </min>
<max> {property name | value} </max>
</clipto>]
[<output> {property} </output>]
</actuator>

However When i have tried it the actuator component is not recognized as a real component.
How can i implement in my aircraft model a model for the behaviour of the actuators?
I would much appreciate any help because it is very important to me checking if my aircraft is going to be controlable at high speed.
Thank you in advance,
juanma

Juan Manuel de las Heras
Departamento de Programas Aeronauticos
Instituto Nacional de Técnica Aerospacial (INTA)
Carretera de Ajalvir km.4
28850 Torrejon de Ardoz
Madrid
Tlf. 915201284

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