Re: [Flightgear-devel] Autopilot fun
On Tuesday 23 March 2004 22:28, Martin Spott wrote: > Lee Elliott wrote: > > Ta for pointing out the high-speed oscillation problem - I've got to > > confess that all the recent AP changes were only tested at relatively low > > speeds i.e. flying circuits to check take-offs & landing. I'll have a > > look into it. > > When you're done with that I'll send you my suggestions for > auto-landing (despite the fact that I suspect auto-landing to be really > boring ;-)) > > Martin. It's not boring - it's an interesting problem:) LeeE ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Autopilot fun
Martin Spott said: > Lee Elliott wrote: > > > Ta for pointing out the high-speed oscillation problem - I've got to confess > > that all the recent AP changes were only tested at relatively low speeds i.e. > > flying circuits to check take-offs & landing. I'll have a look into it. > > When you're done with that I'll send you my suggestions for > auto-landing (despite the fact that I suspect auto-landing to be really > boring ;-)) > Hehe...well actually it is pretty exciting from an engineering perspective ;-) For the oscillations, it seems that using the PI simple controller setup fixed this issue in the 747...althought I would have to do a lot more testing at various altitudes and mach numbers to be sure that it is indeed fixed. One thing is that in some cases the 747 would climb to altitude and level off at a stable cruise, but things like turbulance and/or entering a command to change altitude would introduce the porpoising. To test for that quickly, I get the aircraft cruising nice and smooth, then pull the stick all the way back for a couple seconds and let it go (this is a joystick so it springs back to neutral). If things are ok the upset aircraft will stabilize in just a few seconds. Best, Jim ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Autopilot fun
Lee Elliott wrote: > Ta for pointing out the high-speed oscillation problem - I've got to confess > that all the recent AP changes were only tested at relatively low speeds i.e. > flying circuits to check take-offs & landing. I'll have a look into it. When you're done with that I'll send you my suggestions for auto-landing (despite the fact that I suspect auto-landing to be really boring ;-)) Martin. -- Unix _IS_ user friendly - it's just selective about who its friends are ! -- ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Autopilot fun
On Tuesday 23 March 2004 17:53, Martin Spott wrote: > Lee Elliott wrote: > > On Monday 22 March 2004 16:01, Martin Spott wrote: > >> Try this: Choose the YF-23, start FlightGear, set the autopilot for > >> altitude (1000+ ft) and heading in the first step, set speed (some 350 > >> kts) as a second step and watch a wild horse riding through the air :-) > > > > The latest YF-23 pending update (note name change from 'yf23') has an > > auto take-off function in the AP that does pretty much that just by > > selecting 'TO' mode. > > Great, the autopilot behaves much calmer than the previous one, > although it still starts to oscillate a bit when I exceed 650 kts, > > Martin. Ta for pointing out the high-speed oscillation problem - I've got to confess that all the recent AP changes were only tested at relatively low speeds i.e. flying circuits to check take-offs & landing. I'll have a look into it. LeeE ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Autopilot fun
Lee Elliott wrote: > On Monday 22 March 2004 16:01, Martin Spott wrote: >> Try this: Choose the YF-23, start FlightGear, set the autopilot for >> altitude (1000+ ft) and heading in the first step, set speed (some 350 >> kts) as a second step and watch a wild horse riding through the air :-) > The latest YF-23 pending update (note name change from 'yf23') has an auto > take-off function in the AP that does pretty much that just by selecting 'TO' > mode. Great, the autopilot behaves much calmer than the previous one, although it still starts to oscillate a bit when I exceed 650 kts, Martin. -- Unix _IS_ user friendly - it's just selective about who its friends are ! -- ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Autopilot fun
Lee Elliott wrote: > The latest YF-23 pending update (note name change from 'yf23') has an auto > take-off function in the AP that does pretty much that just by selecting 'TO' > mode. Hey, I thought, all these near-ground automatisms are for wimps o.k., I admit being a wimp and will try this out ;-) Thanks, Martin. -- Unix _IS_ user friendly - it's just selective about who its friends are ! -- ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Autopilot fun
On Monday 22 March 2004 16:01, Martin Spott wrote: > Try this: Choose the YF-23, start FlightGear, set the autopilot for > altitude (1000+ ft) and heading in the first step, set speed (some 350 > kts) as a second step and watch a wild horse riding through the air :-) > > Martin. The latest YF-23 pending update (note name change from 'yf23') has an auto take-off function in the AP that does pretty much that just by selecting 'TO' mode. It does wallow a bit, at first though. The take-off sequence finishes by leaving the a/c in a mach-hold climb. trouble is that the last time I tried it, it was at > 100,000ft and still climbing at > 50ft/s - whoops:( You shouldn't need to set anything else, although you can set a series of waypoints as long as you hit ctrl-h a couple of times to disable true-heading-mode beforehitting 'TO'. It'll switch to the waypoints, if set, after it's finished it's initial climb-out. LeeE ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
[Flightgear-devel] Autopilot fun
Try this: Choose the YF-23, start FlightGear, set the autopilot for altitude (1000+ ft) and heading in the first step, set speed (some 350 kts) as a second step and watch a wild horse riding through the air :-) Martin. -- Unix _IS_ user friendly - it's just selective about who its friends are ! -- ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
