* Jim Wilson -- Wednesday 04 August 2004 02:55:
Melchior FRANZ said:
[...]
When I noticed that the skids didn't work correctly, I found this VRP bug.
I shifted the model so that the VRP would agree with the YASim origin
and changed the view look-at point accordingly. This fixed the skid
Melchior,
This stuff can get confusing, and I hate to reopen a big can of worms,
and I didn't really pay attention to the JSBsim VRP discussion a while back.
With YAsim you can pick any point as the (0,0,0) point and reference all
your dimensions and positions from there. YAsim handles this
Curtis L. Olson wrote:
Melchior,
This stuff can get confusing, and I hate to reopen a big can of worms,
and I didn't really pay attention to the JSBsim VRP discussion a while
back.
With YAsim you can pick any point as the (0,0,0) point and reference all
your dimensions and positions from
Curt quipped:
If you want to use the same 3d model for multiple FDM configurations
which choose different reference points, then that makes life a lot
harder. I think that is what the JSBsim VRP is for.
I had to laugh when reading these two sentences together. It sort of read ( to me )
* Curtis L. Olson -- Wednesday 04 August 2004 13:58:
[...]
Where you might be getting confused is with the view system. If (0,0,0)
is the nose, then all the external views will center around the nose.
[...]
You wrote pretty much the same as Jim, but you obviously didn't read my
response to
Melchior FRANZ said:
I know. But still, YASim's origin (the nose) is the (unchangeable) VRP, or what
JSBSim calls VRP, right? And the 3D model would also have to be moved such
that the nose is at YASim's 0/0/0, too. But the bo105 does only turn around the
CG if the main *rotor axis* wrongly
Jon Berndt said:
Curt quipped:
If you want to use the same 3d model for multiple FDM configurations
which choose different reference points, then that makes life a lot
harder. I think that is what the JSBsim VRP is for.
I had to laugh when reading these two sentences together. It
* Jim Wilson -- Wednesday 04 August 2004 15:28:
Melchior FRANZ said:
The only difference is JSBSim has the extra feature of specifying the VRP
which is an offset from where 0,0,0 ends up being specified. It saved
changing all the entries for existing flight model configs that had 0,0,0 at
Melchior FRANZ wrote:
* Curtis L. Olson -- Wednesday 04 August 2004 13:58:
[...]
Where you might be getting confused is with the view system. If (0,0,0)
is the nose, then all the external views will center around the nose.
[...]
You wrote pretty much the same as Jim, but you obviously
* Curtis L. Olson -- Wednesday 04 August 2004 16:37:
Could this be a bug in the helicopter specific dynamics of YAsim?
Possibly. It could also be a bug in the bo105 yasim config (one that
isn't obvious to me).
That is a relatively new addition and wasn't written by Andy. Can you
reproduce
Melchior FRANZ
Sent: 04 August 2004 14:49
To: [EMAIL PROTECTED]
Subject: [Flightgear-devel] Re: yasim + bo105 + vrp + @#%$#@ == argh!
* Jim Wilson -- Wednesday 04 August 2004 15:28:
Melchior FRANZ said:
The only difference is JSBSim has the extra feature of
specifying the
VRP
* Vivian Meazza -- Wednesday 04 August 2004 16:50:
Well, I don't know. I've just flown it using a recent CVS download. It
looked really good to me. The point of yaw seemed to be just about at the
rotor hub.
Yes, the version from CVS *seems* to behave right. But it has the 3d model
placed
Melchior FRANZ
Sent: 04 August 2004 16:05
To: [EMAIL PROTECTED]
Subject: [Flightgear-devel] Re: yasim + bo105 + vrp + @#%$#@ == argh!
* Vivian Meazza -- Wednesday 04 August 2004 16:50:
Well, I don't know. I've just flown it using a recent CVS
download. It
looked really good to me
* Vivian Meazza -- Wednesday 04 August 2004 19:15:
Yes, see what you mean, but I think we went through all this with fixed wing
aircraft. But once fully airborne, it's perfect. Weird. Is it trying to
rotate about a skid?
No, same when airborne, just harder to see. You better use the
Melchior FRANZ said:
Did you put the target offset in the right place, in the right file?
I think so, yes. (Well, I hope so, at least. :-)
Can you post what you have, with the model fixed and the target-offsets in, etc?
Best,
Jim
___
* Jim Wilson -- Wednesday 04 August 2004 20:49:
Can you post what you have, with the model fixed and the target-offsets in, etc?
Was already as attached to my first reply to Curt's message as diff.
I'll send it again privately, just in case. :-)
m.
Melchior FRANZ wrote
Sent: 04 August 2004 19:22
To: [EMAIL PROTECTED]
Cc: Maik Justus
Subject: [Flightgear-devel] Re: yasim + bo105 + vrp + @#%$#@ == argh!
* Vivian Meazza -- Wednesday 04 August 2004 19:15:
Yes, see what you mean, but I think we went through all this with
fixed
* Vivian Meazza -- Wednesday 04 August 2004 22:35:
I think all views are fine, although view 2 is a bit disconcerting or even a
bit disorientating. This seems to be a view-based issue. I'm convinced that
the aircraft is rotating appoximately around it's cofg.
This is *not* a view-based issue.
Melchior FRANZ wrote:
* Vivian Meazza -- Wednesday 04 August 2004 22:35:
I think all views are fine, although view 2 is a bit disconcerting or even a
bit disorientating. This seems to be a view-based issue. I'm convinced that
the aircraft is rotating appoximately around it's cofg.
This is
* Curtis L. Olson -- Wednesday 04 August 2004 22:58:
Perhaps you could export some of the FDM data (position, orientation,
etc.) into a text file and graph it. If you approached the problem
carefully, you should be able to get to the bottom of exactly what is
going on.
Good idea. I'll try
On Wed, 4 Aug 2004 23:04:16 +0200
Melchior FRANZ [EMAIL PROTECTED] wrote:
Good idea. I'll try that. Thanks.
Get some sleep, first !!
:-)
Jon
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* Jon S Berndt -- Wednesday 04 August 2004 23:12:
On Wed, 4 Aug 2004 23:04:16 +0200
Melchior FRANZ [EMAIL PROTECTED] wrote:
Good idea. I'll try that. Thanks.
Get some sleep, first !!
Hehe ... OK. It won't be a lot of fun, anyway. I should trace both
origin and CG in lon/lat. Have to
Melchior FRANZ said:
* Jim Wilson -- Wednesday 04 August 2004 20:49:
Can you post what you have, with the model fixed and the target-offsets
in, etc?
attached
m.
That looks fine (at least from pitch and roll angles). It is off a little
bit because the model offsets (in the
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