Hof Markus wrote:
hi,
I've done some changes to A320, works fine, but auto coordination is worst.
Does anyone know how to calculate rudder pos due to bank or whatever to fly a
curve?
There is this easy approach:
fgfs --enable-auto-coordination
I need some delta(???) to do correction of this
I've done some changes to A320, works fine, but auto coordination is
worst.
Does anyone know how to calculate rudder pos due to bank or whatever to
fly a
curve?
There is this easy approach:
fgfs --enable-auto-coordination
see below
I need some delta(???) to do correction of this delta
Hello Erik,
Erik Hofman [EMAIL PROTECTED] wrote:
+ link rel=stylesheet type=text/css
href=http://www.flightgear.org/default.css;
[...]
+ a href=http://www.flightgear.org/;img id=titlebar
src=http://www.flightgear.org/images/fglogosm.jpg; alt=/a
You probably might want to use
Hi Curt,
the 'Contributors' link give 404. The link 'thanks.html' should be 'thanks.shtml'.
Regards,
-Fred
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hi,
is there a possibility to build a Differentiator of a property analog to the
integrator? I did not find somethink like this in the docs for
fcs-components.
I want to build a d/d(t) of a property. Is this the GRADIENT type of
COMPONENT, which is not impl. yet ?
for speed properties there is
hi,
is there a possibility to build a Differentiator of a property
analog to the
integrator? I did not find somethink like this in the docs for
fcs-components.
I want to build a d/d(t) of a property. Is this the GRADIENT type of
COMPONENT, which is not impl. yet ?
for speed properties
Hof Markus wrote:
IMHO this could not be right!
Example: you fly a turn at low bank angle lets say 5°, so you will need no
(or very less) aileron to hold the bank. (aileron = 0)
but at 5° Bank you have to use rudder to fly a correct(!) turn, and
rudder=aileron/ 2 = 0/2 = 0 != rudder needed.
As
Hof Markus wrote:
IMHO this could not be right!
Example: you fly a turn at low bank angle lets say 5°, so you will need
no
(or very less) aileron to hold the bank. (aileron = 0)
but at 5° Bank you have to use rudder to fly a correct(!) turn, and
rudder=aileron/ 2 = 0/2 = 0 != rudder
Hof Markus [EMAIL PROTECTED] said:
I'm not sure of this, but I think you are right! I'll think about.
I tried on A320 to fly turn at 25°BNK an ball was never centered! even
if BNK did'nt change.
Anyway:
to keep the ball centered, as you said, I'll need a rudder due to adverse
yaw (and
Jon Berndt wrote:
For JSBSim aircraft, of course, you can by adding in the appropriate control
channel in the flight control description for hte aircraft. I think
eromatic automatically adds a yaw damper to aircraft created for JSBSim that
way (Dave C.?) The X-15 aircraft has a SAS (Satbility
As David said, there is very little adverse yaw from aileron input on modern aircraft
designs. Now, I have no experience of anything but Cessnas but on an A320 for
example, I would be surprised if the aileron input required to perform say, a 20 deg.
bank turn would require *any* rudder input
On Thu, 08 Jan 2004 14:56:27 +0100
Erik Hofman [EMAIL PROTECTED] wrote:
Jon Berndt wrote:
For JSBSim aircraft, of course, you can by adding in the appropriate
control
channel in the flight control description for hte aircraft. I think
eromatic automatically adds a yaw damper to aircraft
Matthew Law wrote:
flameproof jacket on
So maybe the problem could be with the FDM representing the wrong adverse yaw amount
for that aircraft?
/flameproof jacket on
As someone else mentioned, it's simply a matter of implementing a yaw-damper
in the autopilot -- think of it as a device that
Jon Berndt [EMAIL PROTECTED] said:
It would be nice to have that feature [yaw damper] added to the autopilot
code. Usually it is activated on the ground and then turned off only to
keep
it from screwing up any kick-out on landing. The activating/deactivating
could be handled manually or
Jim Wilson wrote:
Same as solution for dutch roll effect. No?
Not exactly. An autocoordinator moves the rudder to counteract slip
angle. A yaw damper moves the rudder to counteract yaw rate, which is
the time derivative of slip angle. An aircraft can be held in a slip
and a yaw damper won't
Given the description of the 'goal' for the problem (keep the ball
centered), it does seem the idea of using some function of the yaw
acceleration would give sensible results, but I am not a FCS
designer
My 2 cents...
Adverse yaw is created by the difference in the drag produced by
Is position 0,0,0 of an aircraft model the same point as 0,0,0 of the JSBSim
FDM in FlightGear?
I know the JSBSim FDM defines everything using the nose as the origin but I'm
trying to figure out if my model and the FDM are lined up correctly.
BTW: What is this I hear about plib snapping
Paul Surgeon wrote:
Is position 0,0,0 of an aircraft model the same point as 0,0,0 of the JSBSim
FDM in FlightGear?
I know the JSBSim FDM defines everything using the nose as the origin but I'm
trying to figure out if my model and the FDM are lined up correctly.
No JSBSim does not.
JSBSim uses
Would it be possible to create a web based repository of data that we find on
the Net or elsewhere?
Sort of a central repository where everyone can go and look for info first
before they start crawling the Net for hours.
A lot of the FlightGear/JSBSim developers find useful sites with info on
* Paul Surgeon -- Thursday 08 January 2004 20:13:
I am thinking along the lines of a database driven web interface where we can
all submit useful links (URLs, books, etc) with descriptions and categories.
Then people can search for stuff using keywords.
Not directly a database and only
On Thursday, 8 January 2004 21:03, Erik Hofman wrote:
Paul Surgeon wrote:
Is position 0,0,0 of an aircraft model the same point as 0,0,0 of the
JSBSim FDM in FlightGear?
I know the JSBSim FDM defines everything using the nose as the origin but
I'm trying to figure out if my model and
Frederic BOUVIER writes:
Hi Curt,
the 'Contributors' link give 404. The link 'thanks.html' should be
'thanks.shtml'.
Thanks for catching this ...
Curt.
--
Curtis Olson HumanFIRST Program FlightGear Project
Twin Citiescurt 'at' me.umn.edu curt 'at'
Adverse yaw is created by the difference in the drag produced by the
ailerons when banking the aircraft where the 'down aileron' (which raises
the wing) is subject to the higher velocity (energy) of the relative wind
moving under the wing and the 'up aileron feeling less drag from air
moving
Paul Surgeon wrote:
On Thursday, 8 January 2004 21:03, Erik Hofman wrote:
Paul Surgeon wrote:
Is position 0,0,0 of an aircraft model the same point as 0,0,0 of the
JSBSim FDM in FlightGear?
I know the JSBSim FDM defines everything using the nose as the origin but
I'm trying to figure out if my
Hof Markus wrote:
It depends on A/C aerodynamics wheter the plane starts to turn w/ bank angle
!= 0 or not.
Usually the plane does not, so FCPC is mixing some rudder to make the plane
turn.
Which force would else make the plane turn? And I'm sure Bank Angle does
not, may help a little bit.
In
On Thursday, 8 January 2004 21:54, Erik Hofman wrote:
Ehrm, I just discovered it is not very helpful what I said.
I should have said that the *3d models* origin (0, 0, 0) would be places
at the FDM models static CG. The CG of the FDM is (again) relative to
the arbitrary reference point (which
Paul Surgeon wrote:
Shucks ... I must be tired or something because this is getting more and more
confusing by the minute.
What is this arbitrary point you are referring to?
It is a location which you can choose. You can use the CG, the nose of
the aircraft, the center location of the front of
On Thu, 08 Jan 2004 21:34:44 +0100
Erik Hofman [EMAIL PROTECTED] wrote:
Paul Surgeon wrote:
Shucks ... I must be tired or something because this is getting more
and more confusing by the minute.
What is this arbitrary point you are referring to?
It is a location which you can choose. You can
Hi,
I am playing with the autopilot and maintaining an altitidue above sea
level works great. Is there a method for maintaining an elevation above
the ground?
Seamus
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Seamus Thomas Carroll writes:
I am playing with the autopilot and maintaining an altitidue above sea
level works great. Is there a method for maintaining an elevation above
the ground?
Ctrl-t will toggle a mode that attempts to maintain the current
altitude above ground. The algorithm is
On Thu, 8 Jan 2004 20:41:00 +0100
Hof Markus [EMAIL PROTECTED] wrote:
Other topic: Are there any suggestions about how to build a d/d(t) of
a property in fdm
markus
Markus:
For JSBSim, you can use the flight control components. This is a
quick reply, so maybe I have not thought this all the
Dell doesn't seem to market machines with Linux installed anymore, do
they?
Can anyone point me to a major manufacturer that does?
Jon
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Jon S. Berndt wrote:
Dell doesn't seem to market machines with Linux installed anymore,
do they?
Can anyone point me to a major manufacturer that does?
You can get servers from IBM and HP (and maybe others) preinstalled
with Red Hat or SuSE's enterprise offerings, but I'm not aware of
anyone
- Original Message -
From: David Megginson [EMAIL PROTECTED]
To: FlightGear developers discussions [EMAIL PROTECTED]
Sent: Thursday, January 08, 2004 12:19 PM
Subject: Re: [Flightgear-devel] Autocoordination
Hof Markus wrote:
It depends on A/C aerodynamics wheter the plane starts to
On Thursday 08 January 2004 21:40, Curtis L. Olson wrote:
Seamus Thomas Carroll writes:
I am playing with the autopilot and maintaining an altitidue above sea
level works great. Is there a method for maintaining an elevation
above
the ground?
Ctrl-t will toggle a mode that attempts
John Wojnaroski wrote:
Believe it or not, what makes an airplane turn is LIFT... think
about it.
Well, OK. But let's not get too pedantic about things. What makes
any object change velocity is force. The best and most efficient way
to generate force with an airplane is with the wings
John Wojnaroski wrote:
Believe it or not, what makes an airplane turn is LIFT... think about it.
Same thing -- one wing develops more lift than the other, the plane banks
and wants to slip sideways, but as it does the horizontal stabilizer
develops (sideways) lift and swings the nose around
David Megginson wrote:
In the planes I've flown -- admittedly not a wide range of types --
holding rudder generally induces a bank before there's a significant
change in flight direction (as opposed to just heading).
Right, you need to hold it in the slip with opposing ailerons
On Thu, 08 Jan 2004 17:37:25 -0500
David Megginson [EMAIL PROTECTED] wrote:
John Wojnaroski wrote:
Believe it or not, what makes an airplane turn is LIFT... think
about it.
Same thing -- one wing develops more lift than the other, the plane
banks and wants to slip sideways, but as it does the
Andy Ross wrote:
An aircraft held in a level sideslip will turn, for
example, due to the side forces caused by the slip, no wing lift need
be involved.
In the planes I've flown -- admittedly not a wide range of types -- holding
rudder generally induces a bank before there's a significant change
Dell doesn't seem to market machines with Linux installed anymore, do
they?
Can anyone point me to a major manufacturer that does?
Actually they do. I just got a Dell 2650 with Redhat 9 on it. However,
they may not offer them in the home market. (The 2650 is an SMP
machine).
g.
David Megginson wrote:
In the planes I've flown -- admittedly not a wide range of types --
holding rudder generally induces a bank before there's a significant
change in flight direction (as opposed to just heading).
Right, you need to hold it in the slip with opposing ailerons
On Fri, 9 Jan 2004 00:09:08 +0100
Hof Markus [EMAIL PROTECTED] wrote:
Take the A320 (on FG) and watch the ball. All I want to know, which
property to use for trigger function to keep the ball centered.
since you discussed this topic so deeply, I'm sure someone can name
me the property...
I've
Hof Markus wrote:
I'll think about this on weekend, but anyway, wheter to use rudder
or not. Take the A320 (on FG) and watch the ball. All I want to
know, which property to use for trigger function to keep the ball
centered. since you discussed this topic so deeply, I'm sure
someone can
- Original Message -
From: Richard
Hornby
To: [EMAIL PROTECTED]
Sent: Wednesday, January 07, 2004 8:28 PM
Subject: Properties Tree and TSR2
Can somebody help here?
I am trying to see the properties tree using
telnetto localhost 5500. I don't see anything in the (telnet or fg)
* Richard Hornby -- Friday 09 January 2004 00:45:
I am trying to see the properties tree using telnet to localhost 5500.
I don't see anything in the (telnet or fg) console window.
Have you told fgfs to listen to telnet connections?
$ fgfs --telnet=5500
$ telnet localhost 5500
Trying
Quoting Jon S Berndt [EMAIL PROTECTED]:
Other topic: Are there any suggestions about how to build a d/d(t) of
a property in fdm
Markus:
For JSBSim, you can use the flight control components. This is a
quick reply, so maybe I have not thought this all the way out, yet.
But, I suspect
Jon S Berndt [EMAIL PROTECTED] said:
Dell doesn't seem to market machines with Linux installed anymore, do
they?
Can anyone point me to a major manufacturer that does?
Compaq has been doing it the longest. We've been using their stuff since they
bought DEC a few years ago (DEC was the
Jon S Berndt [EMAIL PROTECTED] said:
Within the FDM our math model really doesn't care about the specific
locations of anything. We really only care about the relative
distances from the aircraft CG of things like the wheels, the wings,
the aerodynamic reference point, the pilot eyepoint,
Andy Ross wrote:
John Wojnaroski wrote:
Believe it or not, what makes an airplane turn is LIFT... think
about it.
Well, OK. But let's not get too pedantic about things.
Well, excuse me
with an aircraft. An aircraft held in a level sideslip will turn, for
example, due to the side
Hof Markus wrote:
sorry guys, I don't know what to belive in anymore :)
I'll think about this on weekend, but anyway, wheter to use rudder or not.
Take the A320 (on FG) and watch the ball. All I want to know, which property to
use for trigger function to keep the ball centered.
since you
John Wojnaroski wrote:
Andy Ross wrote:
with an aircraft. An aircraft held in a level sideslip will turn, for
example, due to the side forces caused by the slip, no wing lift need
be involved.
Define 'level', if the wings are level, REALLY level, the rudder will
produce a torgue to turn
Everything you say is true. But none of it means that the aircraft
won't turn, which is all I said. You can make an aircraft turn with
forces that aren't produced by the wings (which should be obvious,
since some aircraft don't have wings yet can still turn). I tried
to be precise, but
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