> Yikes! That's interesting. It's interesting that the file is called
> "roll_stick_limits". Judging by the title alone it would seem to be simply
> a complicated way to calculate the limits of pilot stick roll inputs. In
> fact, this is what the comment at the top of the file says:
>
> "this function calculates the roll command limits for the honeywell control
> laws"
>
> I'd like to see a verbal description of this. It's probably a variable roll
> rate limit based on alpha -- it is an experimental high alpha research
> vehicle after all.
>
> No matter what system is in place in FlightGear, this kind of research stuff
> would only be possible with special custom code.
Hmm, I have not looked very deep in that. But as far as I understood this
honeywell control laws are also implemented in the standard fa-18, not only
the research HARV fa-18.
What I have understood up to now is as follows:
One can get roll moment via the ailerons, this is the normal case. Also by
differential stabilizer (elevator) deflections and using the rudder. This is
what is modeled in this file. Also some of these vaious papers about those
two fa-18 planes which were(are?) owned by the NASA, I have found some
references which claim that the trailing edge flaps together with the leading
edge flaps are used under some circumstances to produce a roll moment.
But back to the aileron, stabilizer and rudder. This control law tries to
compute the most effective combination of surface deflections with a minimum
of movement of those surfaces. It will also take in account the deflection
and rate limts for this aerosurfaces. This is done by some linear
optimization algorythm.
And I guess that this is too hard to do with blocks ...
Other than that I guess that more and more flightcontrol systems will become
more sophisticated in the future. Because if there is already a computer in
the flightcontrol system, why not use it for more then those control theory
blocks.
Greetings
Mathias
--
Mathias Fr�hlich, e-mail: [EMAIL PROTECTED]
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