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#307 ASK-13: YASim solution failure
Originally created by: gijsrooy
Originally owned by: gijsrooy
What steps will reproduce the problem?
1. Launch Flightgear with --aircraft=ask13
What is the expected output? What do you see instead?
FlightGear crashes with the following console message:
YASim SOLUTION FAILURE:
Solution failed to converge after 10000 iterations
Other YASim gliders (or aircraft) that I tried do not show this error.
What version (or GIT date / Hudson build number)?
Today's fgdata, with Hudson from April 16, win32-installer.
What operating system and graphics card?
Windows Vista
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Originally posted by: aeitsch...@yahoo.de
Sounds like an issue with the last change in YASim, seems like the aircraft has to be adapted
Labels: Aircraft
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Originally posted by: gijsrooy
Jannis at wiki: "Changing line 46 in ask13.xml from <stall aoa="12"... to <stall aoa="30"... (taken from ASK21) makes it work again."
I can confirm that it does indeed make the error go away, but is it the right fix? Doesn't it make the FDM less realistic? I have no idea :P
Maybe a YASim guru can help?
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Originally posted by: vivian.m...@lineone.net
Stall AoA of 30 degrees looks more reasonable than 12 degrees to me. I would suggest the FDM config is amended pending any better info.
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Originally posted by: gijsrooy
Fix pushed https://gitorious.org/fg/fgdata/commit/55281d85b74cf20033c609717da2d1856e5c0812
YASim people: feel free to correct if there's a better solution.
Status: Fixed
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Originally posted by: gijsrooy
Not sure if it is the best fix (or even 'a' fix, eventough it does load now), so let's keep it open ;)
Status: Testing
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Originally posted by: aeitsch...@yahoo.de
The author created the fdm after the real one. He said that it came as close as possible to the original one,which he flew in RL. So it would be better to inform the author about the change.
As the YASim fix is probably the cause of the new behaviour, I would rather look at the approach/glide settings.
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Originally posted by: bre... (code.google.com)@gmail.com
The "fix" isn't too great - the ASK13 is almost unflyable - well, rather "unlandable" now. Before the YASim fix the approach glide-angle was used in places where the cruise glide-angle is used now. So, a better fix is to restore the aoa to 30 - but set the cruise glide-angle to 23 instead of 2 (so it's the same as the approach glide-angle). ASK13 flies (lands) much better then. Can s.o. contact the author?
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Originally posted by: gijsrooy
> Can s.o. contact the author?
Tried to do so, but the gmail address that he used on the mailinglist gives a "delivery failure"...
I agree that I should have done so before, it just looked like a low-impact fix to me at the time. I'm rather suprised that you call the ASK13 unflyable now, on my sytem it flies pretty well. It's even weirder that Vivian reported that the ASK13 still doesn't load with the 30-degree-"fix" on his system.
Setting "hstab stall aoa" back to 12 and "cruise glide-angle" to 23 seems to work as well. I don't notice any difference between this and the commited "fix" though, apart from a small change in elevator effectiveness. But both version are flyable (and landable) here...
Did YASim update recently? :S
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Originally posted by: gijsrooy
As "hstab stall aoa=12" (original setting) and "cruise glide-angle=23" (new setting by Thorsten) works for me and apparently for others as well; should we commit that? Now that the author is impossible to contact?
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Originally posted by: bre... (code.google.com)@gmail.com
@gijs: yes, sounds good.
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Originally posted by: gijsrooy
Pushed as of https://gitorious.org/fg/fgdata/commit/86ce43bb9263a268075666e7e6becbf8fbebbc7d
Status: Done
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Originally posted by: bre... (code.google.com)@gmail.com
(No comment was entered for this change.)
Status: Fixed
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Originally posted by: bre... (code.google.com)@gmail.com
(No comment was entered for this change.)
Status: Temp
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Originally posted by: bre... (code.google.com)@gmail.com
(No comment was entered for this change.)
Status: Fixed