Pete Morgan:
> "{re: http://tinypic.com/r/dndoip/6} The Path in Orange is the path the
> NAV hold took roughly to approach Barkway, indeed at the screenshot
> time it was still out. The yellow line is the path I would have expected.
> Ie the correction is not agressive enough, and the final fine correction
> seem to take a lot of track."
I'm not an expert, but is the "coarse course correction" really supposed to be
at almost a 90-degree angle as the yellow line predicts? I always felt that
the max course correction angle was closer to 30 degrees at full deflection --
meaning that the orange line is not too far off from what I would have
expected. I could be wrong, but a 90-degree correction just seems extreme. I
guess someone who knows more about the workings of the Primus1000 can comment
for sure?
Cheers,
-R.
Robert M. Shearman, Jr.
Transit Operations Supervisor,
University of Maryland Department of Transportation
also known as rm...@umd.edu
________________________________
From: Pete Morgan <ac...@daffodil.uk.com>
To: FlightGear developers discussions <flightgear-devel@lists.sourceforge.net>
Sent: Thu, January 21, 2010 10:51:50 PM
Subject: [Flightgear-devel] Bugs: Bravo
Bravo is one of my favourite aircraft, however the autopilot has a few
bugs. I've tried hacking some of this, but am not experienced in what to
change. So I will be following any changes or fixes below with a keen
interest.
*** Heading Hold is "wobbly" ***
At higher speeds, eg 220+ knots the Heading Hold starts to "wobble"
slightly, and sometimes gets into a "full osscialtion". When in an
osscialtion" a new heading, makes the aircraft turn smothly and cancel
ossilation.
Creating the wobble on demand is difficult as the problem seems
intermittent, however, a change in direction, or a change in speed can
"trigger" the effect. Likewise, just leaving the aircraft fly along and
after a few minutes the wobble can appear, maybe caused by turbulence.
*** Nav Hold VOR ***
The Nav Hold also has some "wobble", mostly when turning, although must
less than Heading Hold and sometimes gets into ossilation, sometimes
just a short burst.
----------
When passing over a VOR station, the aircraft wobbles violently.
--------
I'm a bit confused, as the change into a new course takes a long time
to correct. My experiment was over London, and as I cant explain this in
words, I 've made a link to this image below.
http://tinypic.com/r/dndoip/6
The intention was to approach daventry 116.4 at 90, then at deventry,
set course to Barkway 116.25 at 90
The first part in green shown the aircraft on a Heading Hold of 180, I
switched to Nav hold, and the aircraft then continued at 180, then
turned into the Daventry 90 degree as expected indicated by the purple line.
The Path in Orange is the path the NAV hold took roughly to approach
Barkway, indeed at the screenshot time it was still out. The yellow line
is the path I would have expected.
Ie the correction is not agressive enough, and the final fine correction
seem to take a lot of track.
*** Nav Hold - Localizer ***
Localizer- A NAV on a locliser, seems to turn and behave as expected.
This is what above needs to do ;-)
-----
When approaching ILS localiser, the navigation wobbles slightly. It
also can sometimes oscillate to the left and right of the approach.
-------
Just following the localiser, ie NOT the glideslope, eg at 1000ft, then
the aircraft will fly along runway. Once over the localiser, I would
expect the aircraft to continue on the same heading but instead, it goes
off all sorts of places.
eg Alt at 1000ft with localiser to Heathrow 27L, it approached ok, near
the end of the runway it turned right 20 degree, then immedeatley left
until heading at 90, parallel to runway, then for some reason, a while
later turned south heading 180. I would have expected it to just
continue at 270.
-*** Glide Slope ***
Glide Slope - Am unsure how to engage the glideslope, clicking VNAV has
no effect until APPR has been pressed, etc..
---------
When the glideslope is engaged, then the aircraft nose ossilates up and
down from 0 to -4 and makes me feel sick.
*** Altitude hold ***
When changing altitude then there is a bounce.
eg changing from 2000 to 1000 cause the aircraft to immedeately tip
down, then bounce up and down a few times before settling on descent angle.
*** ADF ***
The ADF pointer, selected left of the PFD does not point correctly,
indeed I'm not sure where its pointing at ?. Its not NAV1?
Regards
Pete
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world's best and brightest in the field, creating opportunities for Conference
attendees to learn about information security's most important issues through
interactions with peers, luminaries and emerging and established companies.
http://p.sf.net/sfu/rsaconf-dev2dev
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