[Flightgear-devel] Weekly CVS Changelog Summary: FlightGear source

[Curtis L. Olson]

2f585eeea02e2c79d7b1d8c4963bae2d

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[Flightgear-devel] Weekly CVS Changelog Summary: FlightGear data

[Curtis L. Olson]

2f585eeea02e2c79d7b1d8c4963bae2d

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[Flightgear-devel] Weekly CVS Changelog Summary: SimGear

[Curtis L. Olson]

2f585eeea02e2c79d7b1d8c4963bae2d

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[Flightgear-devel] OT: First solo cross-country

[Ralf Gerlich]

Hi all,

in the well-established tradition of reporting one's milestones on the
way to a license I would like to give a short account on my first
cross-country solo, which I flew today.

As a reminder: I am currently undergoing training for what is called in
Germany a sports pilots license (SPL) for aerodynamically controlled
microlights. I had started this training pretty exactly a year ago and
my practical exam is coming near (last week of April). What has taken me
so long? Lack of time! (Martin has been nagging me the past months to
finally get done with it! ;-)

Yesterday and today we had great weather here in Germany. In South
Germany and at my homebase EDNY (Friedrichshafen) there was not a single
cloud to be seen and visibility must have been well above 50km. Today a
few clouds came up and currently a cold front is going through from the
west (as I'm looking out my window I see pretty dark clouds and I'm
happy that I'm not still up there ;-)

As I'm nearing finalisation of my training I will have to do precision
landing training myself, so first my instructor went to a nearby airport
with less traffic and cheaper landing fees (EDTM - Mengen), to show me
the procedure. From there we went directly back to EDNY to drop my
instructor off, I had a short drink (non-alcoholic of course!) and then
went off by myself.

I already did not feel that nervous on my first solo traffic circuits
(when you have flown that much in a simulator like FlightGear it's hard
to convince your subconciousness of the difference, even though it's
obvious to the other parts of your mind) but today I seemed to be
totally calm.

I returned to EDTM and did a few circuits (aside from the three previous
and not so good precision landings I hadn't had landing training for
some weeks). I didn't do precision landing training because the circuit
was a bit too full.

After 7 landings I was pleased by how the landings went. After I had
paid the landing fees I thought that just returning to EDNY would be a
bit dull. I remembered my instructor (who had replaced "Good bye" with a
cheering "Now finally piss off!" ;-) saying that I should also take this
as a bit of "feel-good-flying" and not just training technicalities.

So I decided to do a trip along the northern shore of Lake of Constance
from west to east, overhead my hometown. I had flown this trip in
FlightGear with our old custom scenery many times so I now finally
wanted to see how it looks like in reality without having my instructor
babbling all the time and telling me that the sphere of the turn
coordinator had wandered about 2mm left of center ;-) (Interestingly,
whenever I looked on the turn coordinator when flying alone, the sphere
was exactly centered. And you can bet that I instinctively looked often ;-)

Still sitting on ground in the plane I improvised some orientation
landmarks, such as a railway starting south of EDTM and leading me
towards the right direction for part of my route. While you can see the
lake already from EDTM when going to about 4000ft MSL (about 2000ft
GND), I just wanted to praktice IFR (I Follow Railroads) a bit. (Yes, I
know, my instructor told me not to practice too much, but that's me
flying, not him, isn't it? ;-)

The railroad was shown as ending in a town called Pfullendorf, from
where I could go straight south to get where I wanted at the lake shore.
So figured that I would be in Pfullendorf when I would find the railroad
to end.

I took off from EDTM, flying straight south to pick up the railroad and
then following it to the west. After some time I reached what looked
like a town which could have been Pfullendorf, but I could see the
railroad seemingly extending westward after that town, so that couldn't
be Pfullendorf.

So I continued westwards. At some point I had a quick check of my
instruments and looked out again. I was unable to locate the railroad
again. I looked backwards towards the town's station. There were the
tracks! Following on to my position I suddenly realised that what I had
followed after the town was the embankment of railroad tracks that had
been. No tracks, just a trail of what had once been a railroad line in
the scenery. I fell for the "neglegience" of the German Railway Company
that had not flatted down the embankment after removing the tracks! ;-)

So I returned and tried to locate the small grass strip - again, for
training - of that town. I finally found it. It had hidden just below
me. :-)

Going south it was easy to identify where I was. You might want to know
that the Lake of Constance is the source of drinking water for a big
part of Southwestern Germany (the state is called "Baden-Wuerttemberg")
up to Stuttgart. So there is a well-visibile pumping and storing station
for the water from the lake at the northwest-most end of the lake.

Up to now flying alone was nothing of great importance. It was just a
natural thing to do. No nervousness or any other big important feelings
of that kind. Just the pleasure of normalc

Re: [Flightgear-devel] "Wild accelerations at low speeds"

[Anders Gidenstam]

On Sat, 7 Apr 2007, Jon S. Berndt wrote:


Anders: Thanks for looking into this. I've got this email marked and hope to
take a look at this soon. This weekend being what it is, I may not get to it
before Wednesday. I also have to report for jury duty on Monday.

Feel free to keep investigating it. :-)


Hi Jon,

In FlightGear and with the c172p the 
.../jsbsim/accelerations/a-pilot-z-ft_sec2 property switches 
sign when I release the brakes and the aircraft starts moving (from 32 
ft/sec^2 to -32 ft/sec^2). I didn't notice this before.


This seems very strange and could explain the instrument problems.

The behaviour is reproducible in JSBSim standalone using the JSBSim 
c172p and the attached script (which sets the c172p off down the runway 
with brakes applied). The pilot acceleration a-pilot-z-ft_sec2 starts out 
as +32 but switches to -32 when the aircraft starts moving.



Cheers,

Anders
--
---
Anders Gidenstam
mail: anders(at)gidenstam.org
WWW: http://www.gidenstam.org/FlightGear/JSBSim-LTA/

c172pbrake.xml
Description: application/xml
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Re: [Flightgear-devel] Flight tracking

[Gabor Toth]

And don't forget the FG tracker site.

  http://fgfs.i-net.hu

Happy long weekend :)
Gabor

On Saturday 07 April 2007 00:43, Curtis Olson wrote:
> It wouldn't hurt if I posted the url to my flight track ...
>
> http://trekme.com/clolson/
>
> Happy Easter,
>
> Curt.
>
> On 4/6/07, Curtis Olson wrote:
> > Here's another wrinkle on flight tracking.  I've figured out how to plot
> > periodic points of a flight live on the trekme.com site.  It's an
> > interesting way to archive your flight tracks if you want.  You can also
> > upload gps tracks from hikes, bikes, kayaking adventures, drives, and
> > just about any other motion related activity ...  It's also a pretty cool
> > site because along with your track, you can attach pictures and a blog to
> > individual points ... a neat way to share your adventures ... and I'm
> > abusing it (with permission) to track a flightgear flight.
> >
> > Curt.
> > --
> > Curtis Olson - University of Minnesota - FlightGear Project
> > http://baron.flightgear.org/~curt/ 
> >   http://www.humanfirst.umn.edu/   http://www.flightgear.org
> > Unique text: 2f585eeea02e2c79d7b1d8c4963bae2d

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[Flightgear-devel] H4-Hercules-wrong FDM author name

[gh.robin]

Hello, 
I notice, these two files 

___data/Aircraft/H4-Hercules/h4-hercules-base.xml

___data/Aircraft/H4-Hercules/h4-hercules-jsbsim.xml

refer to my name, Gérard ROBIN.
In spite of the honor to be taken as a specialist,
i never did anything regarding the FDM, but explaining on how to use 
Aeromatic. 

Does someone with CVS access can correct it, and remove my name from these two 
files.


Thanks
-- 
Gérard

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Re: [Flightgear-devel] New [lightning] refueling demo

[Nick Warne]

On Saturday 07 April 2007 16:34:29 Julien Pierru wrote:
> Yes i would be interested in that demo.

:-)

Attached is the file 'lightning_demo.xml'.  This lives in /data/AI/  
directory.  To use, in the /data/Aircraft/Lightning/lightning-set.xml  file 
change the  option  from:

refueling_demo1

to:

lightning_demo

That is all you need do.  Then start at KSFO, use TACAN to locate the tanker 
(040X)... and fly in formation!

http://www.nick.ukfsn.org/fg/lightning/lightning_refuel3.jpg

Nick




 

  
 The following scenario puts an aerial tanker in orbit over
 KSFO at 3000 ft AGL. The tanker uses the 737 model,
 but you can use any model (a KC-135 model can be
 found at:
 http://home.comcast.net/~davidculp2/hangar/hangar.html).
 The center of the orbit is actually west of KSFO, and the
 eastern edge of the orbit passes over the airport.  Note
 that AI aircraft do not react to wind, therefore your speed
 and bank angle will have to vary along the orbit since
 your "user" aircraft *does* react to the wind.

 I recommend using the T-38 as your airplane for four
 reasons: (1) it has a radar screen which may be needed
 to find the tanker;  (2) it has the speed to catch the
 tanker; (3) it uses a JSBSim FDM, which means it can
 onload fuel; (4) it has a green light added to the
 instrument panel, between the fuel gauges, which comes
 on when you are in the refueling envelope.

 Right now the air refueling envelope is very loose, and I
 plan on tightening it up in the future.  Currently no
 aerodynamic effects of refueling are modeled
 (i.e downwash, bow wave, vortices).

 Dave Culp,  davidculp2 at comcast.net

 
	Lightning refueling demo (lightning_demo.xml).

 I have extended the above basic demo from David, and added
 in four AI Lightning aircraft flying in formation;  this
 adds to and causes you to concentrate more on refueling
 or just to practice your skill at flying in a (sort of)
 formation.  Primarily it is designed for the use with the
 English Electric Lightning aircraft, but you can use any
 aircraft you wish, of course.
 
 It does take extra CPU/GPU power, so if four aircraft are too
 much for your system, you can   out the aircraft
 as required.

 Screenshots:
	http://www.nick.ukfsn.org/fg/lightning/lightning_refuel1.jpg
	http://www.nick.ukfsn.org/fg/lightning/lightning_refuel2.jpg
	http://www.nick.ukfsn.org/fg/lightning/lightning_refuel3.jpg

Nick Warne,	 nick at linicks . net - 7th April, 2007
 
  
 
  
   ESSO1
   aircraft
   tanker
   Models/Geometry/KC135/KC135.xml
   37.61633
   -122.38334
   3500
   020
   280
   -15
  

  
   Lightning1
   aircraft
   fighter
   ../Aircraft/Lightning/Models/lightning-model.xml
   37.61580
   -122.38280
   3440
   020
   280
   -15
  

  
   Lightning2
   aircraft
   fighter
   ../Aircraft/Lightning/Models/lightning-model.xml
   37.61580
   -122.38384
   3400
   020
   280
   -15
  

  
   Lightning3
   aircraft
   fighter
   ../Aircraft/Lightning/Models/lightning-model.xml
   37.61663
   -122.38284
   3460
   020
   280
   -15
  

  
   Lightning4
   aircraft
   fighter
   ../Aircraft/Lightning/Models/lightning-model.xml
   37.61693
   -122.38384
   3420
   020
   280
   -15
  

 


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Re: [Flightgear-devel] New [lightning] refueling demo

[Julien Pierru]

Yes i would be interested in that demo.
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Re: [Flightgear-devel] terragear problem

[Curtis Olson]

Do your intermediate files (before terrafit) look good?  Is it an hgtchop
problem or a terrafit problem?  Double check your paths very carefully,
that's usually where things can go wrong.

Curt.

On 4/7/07, Didier Fabert wrote:


Hi,

I forgot to tell you i'm on an amd64 !
today, I see that Chris Metzler have the same problem on the terragear
devel
list.

Didier.

--
Didier Fabert
[EMAIL PROTECTED]
KFreeFlight project : A FlightGear GUI-Frontend designed for KDE users
http://kfreeflight.sourceforge.net

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--
Curtis Olson - University of Minnesota - FlightGear Project
http://baron.flightgear.org/~curt/  http://www.humanfirst.umn.edu/
http://www.flightgear.org
Unique text: 2f585eeea02e2c79d7b1d8c4963bae2d
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Re: [Flightgear-devel] terragear problem

[Didier Fabert]

Hi,

I forgot to tell you i'm on an amd64 !
today, I see that Chris Metzler have the same problem on the terragear devel 
list.

Didier.

-- 
Didier Fabert
[EMAIL PROTECTED]
KFreeFlight project : A FlightGear GUI-Frontend designed for KDE users
http://kfreeflight.sourceforge.net

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Re: [Flightgear-devel] "Wild accelerations at low speeds"

[Jon S. Berndt]

Anders: Thanks for looking into this. I've got this email marked and hope to
take a look at this soon. This weekend being what it is, I may not get to it
before Wednesday. I also have to report for jury duty on Monday.

Feel free to keep investigating it. :-)

Jon

> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] Behalf Of
> Anders Gidenstam
> Sent: Saturday, April 07, 2007 7:44 AM
> To: FlightGear developers discussions
> Subject: Re: [Flightgear-devel] "Wild accelerations at low speeds"
>
>
> On Sat, 7 Apr 2007, Anders Gidenstam wrote:
>
> > On Fri, 6 Apr 2007, Jon S. Berndt wrote:
> >
> > It turns out that the slip-skid ball is driven by the properties
> > /accelerations/pilot/y-accel-fps_sec and
> > /accelerations/pilot/z-accel-fps_sec
> >
> > which seem to be copied from the JSBSim properties
> > .../jsbsim/accelerations/a-pilot-y-ft_sec2 and
> > .../jsbsim/accelerations/a-pilot-z-ft_sec2 .
> >
> > What is remarkable about the a-pilot-*-ft_sec2 properties is that they
> > are nonzero even when the aircraft and pilot is at rest on the ground.
> > E.g. a-pilot-z-ft_sec2 is 32.1 ft/sec^2 (= g I presume - I'm a
> SI person;)
> >
> > I don't know if that behaviour in JSBSim is intended or not - but the
> > SlipSkidBall.cxx clearly does assume such behaviour.
>
> Typo: SlipSkidBall.cxx clearly does /NOT/ assume such behaviour.
>
> Sorry!
>
> /Anders
> --
> --
> -
> Anders Gidenstam
> mail: anders(at)gidenstam.org
> WWW: http://www.gidenstam.org/FlightGear/JSBSim-LTA/
>
> -
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Re: [Flightgear-devel] "Wild accelerations at low speeds"

[Anders Gidenstam]

On Sat, 7 Apr 2007, Anders Gidenstam wrote:

> On Fri, 6 Apr 2007, Jon S. Berndt wrote:
>
> It turns out that the slip-skid ball is driven by the properties
> /accelerations/pilot/y-accel-fps_sec and
> /accelerations/pilot/z-accel-fps_sec
>
> which seem to be copied from the JSBSim properties
> .../jsbsim/accelerations/a-pilot-y-ft_sec2 and
> .../jsbsim/accelerations/a-pilot-z-ft_sec2 .
>
> What is remarkable about the a-pilot-*-ft_sec2 properties is that they
> are nonzero even when the aircraft and pilot is at rest on the ground.
> E.g. a-pilot-z-ft_sec2 is 32.1 ft/sec^2 (= g I presume - I'm a SI person;)
>
> I don't know if that behaviour in JSBSim is intended or not - but the
> SlipSkidBall.cxx clearly does assume such behaviour.

Typo: SlipSkidBall.cxx clearly does /NOT/ assume such behaviour.

Sorry!

/Anders
-- 
---
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mail: anders(at)gidenstam.org
WWW: http://www.gidenstam.org/FlightGear/JSBSim-LTA/

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Re: [Flightgear-devel] "Wild accelerations at low speeds"

[Anders Gidenstam]

On Fri, 6 Apr 2007, Jon S. Berndt wrote:

> If the engine is off and the brakes are released, what happens, then? That
> is, does it only happen when brakes are on, while at rest?
>
> Which property drives the inclinometer?

Hi,

It turns out that the slip-skid ball is driven by the properties
/accelerations/pilot/y-accel-fps_sec and
/accelerations/pilot/z-accel-fps_sec

which seem to be copied from the JSBSim properties
.../jsbsim/accelerations/a-pilot-y-ft_sec2 and 
.../jsbsim/accelerations/a-pilot-z-ft_sec2 .

What is remarkable about the a-pilot-*-ft_sec2 properties is that they
are nonzero even when the aircraft and pilot is at rest on the ground.
E.g. a-pilot-z-ft_sec2 is 32.1 ft/sec^2 (= g I presume - I'm a SI person;)

I don't know if that behaviour in JSBSim is intended or not - but the 
SlipSkidBall.cxx clearly does assume such behaviour.

Cheers,

Anders
-- 
---
Anders Gidenstam
mail: anders(at)gidenstam.org
WWW: http://www.gidenstam.org/FlightGear/JSBSim-LTA/

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[Flightgear-devel] New [lightning] refueling demo

[Nick Warne]

Hi all,

I have set up a new refueling demo, makes it a bit more interesting:

http://www.nick.ukfsn.org/fg/lightning/lightning_refuel1.jpg

http://www.nick.ukfsn.org/fg/lightning/lightning_refuel2.jpg

I will tidy up the demo and submit if anybody is interested in this.

Nick

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