Re: [Flightgear-devel] Autopilot and violent roll

2009-10-10 Thread leee
On Saturday 10 Oct 2009, Pete Morgan wrote: > Roy Vegard Ovesen wrote: > > On Saturday 10 October 2009 22:33:01 Curtis Olson wrote: > >> Really, this is all in how the autopilot is tuned and > >> configured. > >> > >> FlightGear doesn't model realistic control surface deflection > >> rates so it's

[Flightgear-devel] time.h (was Re: GPS / route-manager landing)

2009-10-10 Thread James Turner
On 10 Oct 2009, at 08:56, Olaf Flebbe wrote: >> Also, if we have two consistent time_t, why not simply subtract one >> from >> the other, ABS it, and voila you have the time difference ? Or am I >> missing something regarding usage of difftime ? > > yes. there is no _standard_ mapping of the da

Re: [Flightgear-devel] Autopilot and violent roll

2009-10-10 Thread Jon S. Berndt
> From: Roy Vegard Ovesen [mailto:roy.v.ove...@haugnett.no] > > Control surface deflection rate can be limited by inserting a low-pass > filter > between the output of the final PID-controller and the control surface. > THis > is done in the autopilot config file. > For JSBSim aircraft, you also

Re: [Flightgear-devel] Autopilot and violent roll

2009-10-10 Thread Pete Morgan
Roy Vegard Ovesen wrote: > On Saturday 10 October 2009 22:33:01 Curtis Olson wrote: > >> Really, this is all in how the autopilot is tuned and configured. >> >> FlightGear doesn't model realistic control surface deflection rates so it's >> possible to command an instantaneous deflection of the c

Re: [Flightgear-devel] Autopilot and violent roll

2009-10-10 Thread Roy Vegard Ovesen
On Saturday 10 October 2009 22:33:01 Curtis Olson wrote: > > Really, this is all in how the autopilot is tuned and configured. > > FlightGear doesn't model realistic control surface deflection rates so it's > possible to command an instantaneous deflection of the control surfaces. Control surface

Re: [Flightgear-devel] Autopilot and violent roll

2009-10-10 Thread Curtis Olson
On Sat, Oct 10, 2009 at 3:23 PM, Heiko Schulz wrote: > If you mean this sudden banking when after reaching a new wayoint: yes. It > is known and is still on the bug-list on flightgear.org anywhere. > > There were some aircraft authors who had a workaround with nasal- to my > knowledge the 787 For

Re: [Flightgear-devel] Autopilot and violent roll

2009-10-10 Thread Heiko Schulz
> > This is a problem across the whole system and  a mega > fault. > If you mean this sudden banking when after reaching a new wayoint: yes. It is known and is still on the bug-list on flightgear.org anywhere. There were some aircraft authors who had a workaround with nasal- to my knowledge t

Re: [Flightgear-devel] Autopilot and violent roll

2009-10-10 Thread Pete Morgan
Alan Teeder wrote: > Do you really expect much help after that "stuff you lot" remark? > Sorry.. guess it my frustration... > As a former autopilot designer I would suggest that what is needed is a rate > limit on roll angle demand within the autopilot. You could also try to add > some roll damp

[Flightgear-devel] Autopilot

2009-10-10 Thread Pete Morgan
We need to define the autopilot properly and define its behaviour. At it's most basic I expect the autpoilot to fullfil the following functions. 1) maintain a heading - ie go that way direction - this "jerks" violently in the sim 2) Altitude hold - this works, and on the motion platform it work

Re: [Flightgear-devel] Autopilot and violent roll

2009-10-10 Thread Alan Teeder
Do you really expect much help after that "stuff you lot" remark? As a former autopilot designer I would suggest that what is needed is a rate limit on roll angle demand within the autopilot. You could also try to add some roll damping within the autopilot. It is possible that the FDM for your air

Re: [Flightgear-devel] Autopilot and violent roll

2009-10-10 Thread Pete Morgan
Actually my motion platform is at the momnet I am taking it one step at a time.. ie so far its banking left to right by around 10 degree's which kinda exagarrated the sim and is useful.. Anyone as a pilot at the moment can tip the aircfaft to lbank.. However this jerk needs solving.. SO what y

Re: [Flightgear-devel] Autopilot and violent roll

2009-10-10 Thread Curtis Olson
I haven't looked at these autopilot configurations (at least not for a long time) but off the top of my head, I think this can all be fixed by tuning the autopilot. For instance, lowering the max aileron deflection from (-1 ... 1) down to maybe (-0.1 ... 0.1) might be an interesting thing to start

[Flightgear-devel] Autopilot and violent roll

2009-10-10 Thread Pete Morgan
I'm working on my motion sim for xmas. Its powered by a vacum cleaner atmo.. One BIG BIG problem - am basicng the cockpit on Bravo and 787 The autopilot heading bug is very violent and JERKS to direction.. How can we solve that problem please because on my motion platform, I cant keep up with th

Re: [Flightgear-devel] SimGear compile error

2009-10-10 Thread Anders Gidenstam
On Sat, 10 Oct 2009, dave perry wrote: > I have --build=i686 as a switch to configure. Where do I supply "-march="? You set CXXFLAGS and CFLAGS (but the latter might not be needed). My configure line starts with: configure CFLAGS="-O2 -g -march=core2 -mfpmath=sse -Wall" CXXFLAGS="-O2 -g -pipe

Re: [Flightgear-devel] SimGear compile error

2009-10-10 Thread dave perry
Mathias Fröhlich wrote: > Hi, > > A recent checkin into SGAtomic.cxx brakes that. > > Either provide a -march= option higher than i386 to your compile, or revert > to > rev 1.3 of SGAtomic.cxx. > > I am currently asking the author of that change what this patch should fix. > > > I have --build

Re: [Flightgear-devel] SimGear compile error

2009-10-10 Thread Mathias Fröhlich
Hi, A recent checkin into SGAtomic.cxx brakes that. Either provide a -march= option higher than i386 to your compile, or revert to rev 1.3 of SGAtomic.cxx. I am currently asking the author of that change what this patch should fix. Greetings Mathias -

Re: [Flightgear-devel] SimGear compile error

2009-10-10 Thread Anders Gidenstam
On Sat, 10 Oct 2009, dave perry wrote: > With today's SimGear CVS, I am getting the following compile error > Making all in props > make[3]: Entering directory `/home/dad/source-osg/SimGear/simgear/props' > g++ -g -O2 -D_REENTRANT -lOpenThreads -o props_test props_test.o > libsgprops.a ../../sim

[Flightgear-devel] SimGear compile error

2009-10-10 Thread dave perry
With today's SimGear CVS, I am getting the following compile error Making all in props make[3]: Entering directory `/home/dad/source-osg/SimGear/simgear/props' g++ -g -O2 -D_REENTRANT -lOpenThreads -o props_test props_test.o libsgprops.a ../../simgear/xml/libsgxml.a ../../simgear/misc/libsgmisc.

Re: [Flightgear-devel] Exposing a property over MP

2009-10-10 Thread Mathias Fröhlich
Hi, On Thursday 08 October 2009 22:09:40 Martin Spott wrote: > If bandwidth is not a matter, then you'd probably want to jump on the > HLA train and join the CERTI/VirtualAir effort. They're offering > everything like subscribing to attributes and the such yet I have > to state that reduced

Re: [Flightgear-devel] Exposing a property over MP

2009-10-10 Thread Mathias Fröhlich
Hi, On Thursday 08 October 2009 17:29:21 James Turner wrote: > Related to the new route-manager: I could very easily define a string > property which contains a plain text summary of the filed flight-plan. > What is the magic required to expose that string (which be 200 or 400 > bytes, I guess, d

Re: [Flightgear-devel] GPS / route-manager landing

2009-10-10 Thread Olaf Flebbe
Hi, > > Also, if we have two consistent time_t, why not simply subtract one from > the other, ABS it, and voila you have the time difference ? Or am I > missing something regarding usage of difftime ? yes. there is no _standard_ mapping of the data type time_t to any standard C/C++ data type.