Hi Alexis, (Second attempt at sending this - the first seems to have vanished)
I just had a quick look at the config (and stand-alone YASim output) and it does look as though the elevator does have too much authority. Try changing the hstab lift and drag values to 1.475 1.5 respectively. This should increase the Approach Elevator (norm) from -0.461570 to -0.777591, effectively reducing it's authority. The autopilot altitude modes will probably need some re-tuning though. A big problem with joystick/pedal/control surface sensitivity in a sim is the lack of force-feedback (or force-input for side-stick controllers) from the stick/pedals. LeeE On Friday 25 January 2008 00:00, alexis bory wrote: > Hi all, > > We are proud to announce a brand new fuel system and a > rewamped start procedure for the A-10. > > And... as a new year gift, here is the begining of the A-10 SAS > (Stability Augmentation System). > > Well, the fuel system is now accuratly modeled, thanks to David > Bastien aka davidB21. David also reworked the engines and > APU. The start procedure is slightly different now. He did a > great and huge job on this part. > > Short explaination on how to start it: > Start the APU as usual, Click on one throttle hotspot to engage > it to IDDLE, the engine starts. Wait for the Engine Start Cycle > to be over (see the warning light) Then do the same for the > second engine. > More documentation to come. > > ...And the SAS: > > Now the A-10 is really smooth in pitch and it dives perfectly. > Andy was right when saying "are you sure that your elevator > hasn't too much authority?" > > I removed the dirty workaround with the moving ballast. I have > now to work the air brakes pitch compensation and the rudder. > > Enjoy, and thanks again to David > > Alexis > > > -- > > Here the CVS commit description: > > - Major update: > > DavidB21: Fuel System and Engine/APU related stuff. > > - Flaps lever animation near throttle. > - Real A-10 fuel pumps logic implemented (both main and wing). > - Fuel pumps will not provide enough pressure during negative G > flight. Engine have sufficient fuel in his collector for 10 > seconds operation at maximum power. > - In case of main pump failure, the affected engine will > suction-feed from the tank for all power settings up to an > altitude of 10,000ft on a standard day (29.92 InHG pressure at > sea-level). > - In case of wing pump failure, fuel will gravity feed to its > associated main tank if the main tank fuel level is below 600 > lbs. > - Real fuel valves logic implemented (tank gate, cross feed, > external tanks and internal fill disable valves). > - Air-Air refuel slipway door is now powered by the right > hydraulic system. - Nasal function (see > A10fuel.aar_reset_button()) to reset the air-air refuel system > from "disconnected" state to "ready" state without having to > close the recover lever. This function could be tied to a > joystick button. > - New APU code. APU starts can be made up to an altitude of > 15,000ft on a standard day. APU pressure output will be > sufficient to start an engine up to an engine of 10,000ft on a > standard day. > - APU generator now cooling the APU. During ground operation, if > the APU EGT exceed 720°C it will be automatically shutdown. If > temperature exceed 850°C the APU is killed. > - Right and left hydraulic pressures tied to the engines core > speed. - Throttle have now an OFF and IDLE positions. You have to > click on a hotspot in order to move the throttle from OFF to IDLE > and reciprocally. - Real engines autostart logic and engine start > cycle implemented (like real A-10 block 45 and superior). > - "NORM" and "MOTOR" engine operate switchs logic implemented. > Switches are spring-loaded from "IGN" to "NORM" position. > - "NORM" engine operate switch is used for normal operation and > autostart. "MOTOR" is used for air-purging of excessive fuel in > the collector tanks (if throttle is in OFF position). > - New engine start system: now engine start require low pressure > from the APU or cross bleed air from the other engine (85% core > rpm minimum). > > > Alexis Bory: Pitch SAS (Stability Augmentation System) > > This the first part of the A-10 SAS. (more to come) > > - Panel with Pitch SAS switches (right of the throttles). Try a > 30° dive with the Pitch SAS off. > - Pitch SAS smooths the elevator stick input (function of time). > - Pitch SAS compress and damps the elevator output when positive > (diving) and > AoA < 2°. > - Removed the movable ballast wich was a dirty workaround. > > > > ----------------------------------------------------------------- >-------- This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft(R) Visual Studio 2008. > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > _______________________________________________ > Flightgear-devel mailing list > Flightgear-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/flightgear-devel ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
