> I got two questions to ask...
> 
> 1.  When an aircraft has ZERO velocity, given some rudder input, and
> also when there is no wind, should the rudder actually have any effect
> at all?  I see the c-172 actually turn, and over a period of time, if
> left alone, flip over, do some gymnastics, sometimes reset itself to
> some random altitude...  Same applies to the elevator.  I've noticed
> that it happens when jitter is more pronounced (with no wind), that if
> u pull back on the stick, the aircraft actually tries to pitch up.  I
> don't know if this only on my version of FG9.8 (Windows)...

Strange. Are you sure there's no wind? I'll take a look.

> 2.  This would be more JSBsim related...  I run FG on 2 computers on
> campus... the jitter in the cessna is more pronounced.  I then ran FG
> with similar parameters (ie. no wind) on my personal laptop, again
> with Windows and with a similar configuration as one of the computers
> on campus.  There was NO jitter!!!  I have not edited any files,
> everything is being run as is after downloading the binaries.  Is
> there an explanation for this behavior?

I don't know why that would be. That's interesting.

Jon


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