Archive > Flight Simulation
Weight calculation
EHM-1001 Robert:
I think, the autopilot problem is a typical controlling/automation problem.
In simple: the system that had to be controlled (now, the aircraft) have always many parameters about responding an effect that moves it out from the stable state. The controller have principles, how to control the system, how much effect and when should it apply on the system, to keep in a stable state. These two functions have some common parts. In a good situation, the controller will keep the system in a stable state for every kind of outer effects. In a bad situation, the controller cannot follows the outer effects and will move the system into an unstable state, which means a typical oscillation of the system.
Lets turn it into aviation language: the aircraft have many aerodynamical parameters, like center of gravity, weight, different locations of loads, drag, lifting force, angle of attack... many parameters. The controller: autopilot, have some programmed principles, that how much vertical trim should it apply to keep the plane in the given descending/climbing rate. If you change the system -modifying the center of gravity, aircraft weight, loads...- without fine tuning also the controller, you will probably got an unstable working system, so the autopilot will not be able to keep the plane in a stable climbing/descending rate.
We are in a bad situation, because we can easily change the aircraft parameters, as these are all stored in the aircraft.cfg file, but we cannot change the autopilot response, because it is stored in the aircraft.air file, which is not perfectly discovered.
EHM-0001 Gergely:
In FS2004 they are also in the cfg file (check the [autopilot] section), although I don't quite understand what effects does those settings have...
EHM-0695 Scott:
Indeed.... I suggest adjusting the pitch stability (lowering) in the [flight_tuning] section and observe the effect. The pitch oscillation is an age old problem dating back to FS98.... The MOI's are not properly configured for the offending aircraft. You should recalculate the MOI's.
Also, increasing/decreasing the elevator_trim_effectiveness value may help.
EHM-0962 Zhen Yi:
--- Quote ---Originally posted by YR-TGM
In FS2004 they are also in the cfg file (check the [autopilot] section), although I don't quite understand what effects does those settings have...
--- End quote ---
Well just modify some settings and see what happens! :P
EHM-0641 Rico:
--- Quote ---Originally posted by EHM-0962
Well just modify some settings and see what happens! :P
--- End quote ---
LOL ;D
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version