Looks like a spin, does not it ? ;)
That is with stock JSBSim FDM ... attachment: spin.jpg
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Subject: Re: [Flightgear-devel] Aerobatics using flight gear and JSBSim
Looks like a spin, does not it ? ;)
That is with stock JSBSim FDM ...
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Objet : Re: [Flightgear-devel] Aerobatics using flight gear and JSBSim
Very cool. I guess you survived, or you would not be writing this. ;-)
Did the spin seem to enter and exit normally?
Jon
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Jon S. Berndt wrote:
..another big deal to dig up: Downwash.
There may end up being some things that don't get specifically addressed,
but must be defined by the user with functions and tables. What I'd like
most to do is to provide all the basic building blocks needed so that the
user is
On Fri, 16 Jun 2006 09:54:39 +0200, Erik wrote in message
[EMAIL PROTECTED]:
Jon S. Berndt wrote:
..another big deal to dig up: Downwash.
There may end up being some things that don't get specifically
addressed, but must be defined by the user with functions and
tables. What I'd
Isn't downwash just a matter of a high angel-of-attack?
Erik
When air passes over the wing, an incremental downward redirection is
induced, so the horizontal tail sees a different airflow than the wing.
Jon
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Jon S. Berndt wrote:
Isn't downwash just a matter of a high angel-of-attack?
When air passes over the wing, an incremental downward redirection is
induced, so the horizontal tail sees a different airflow than the wing.
Oh, downwash of the aircraft itself. I was thinking because of wind but
I
Jon S. Berndt wrote:
Isn't downwash just a matter of a high angel-of-attack?
When air passes over the wing, an incremental downward redirection is
induced, so the horizontal tail sees a different airflow than the wing.
Oh, downwash of the aircraft itself. I was thinking because of wind
Jon S. Berndt wrote:
If I understand it correctly it should be possible to simulate the
effects of downwash by creating a function of flap-settings and airspeed
(and possible alpha), no?
Maybe. I haven't thought about that much, yet. Try it. ;-)
I did try something like this, but for
Did you get the Sukhoi ?
If you want I can send you a slightly updated model...
rgrds
Enrique
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Just came across this video:
http://www.angelfire.com/il2/aphs/what_up_dog.wmv
Are we ready to model this kind of aerobatics in FG?
Andras
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On Jun 14, 2006, at 8:23 PM, Jon S. Berndt wrote:
Maybe said a different way, imagine your wing is riding on the
edge of
the amount of air it can push down without stalling. Now you deflect
the aileron down and try to push the air down even more.
Stupid me. I forgot something. OK,
On Jun 14, 2006, at 8:33 PM, Josh Babcock wrote:
Jon S. Berndt wrote:
Snap roll:
This is indeed the recipe for a snap roll: starting from a speed
slightly
above the stall, apply a sudden yaw with the rudder, apply
opposite aileron,
and pull back on the yoke. SNAP! --- One wing stalls
Adam Dershowitz wrote:
I don't believe so. Remember that a snap roll is a type of spin. So
We are probably both right. If the wing were to be split into several
sections, the effect that you describe would be approximated (a-la
X-plane), or you could add another table which could be much
On Thu, 15 Jun 2006 18:08:25 -0500, Jon wrote in message
[EMAIL PROTECTED]:
Hmm, so how would JSBSim model low speed control reversals like
this? Could it be done in a way that would also be able to model
transonic control reversals that are caused by shockwaves near the
control surface
..another big deal to dig up: Downwash.
--
..med vennlig hilsen = with Kind Regards from Arnt... ;o)
There may end up being some things that don't get specifically addressed,
but must be defined by the user with functions and tables. What I'd like
most to do is to provide all the basic
On Thu, 15 Jun 2006 18:45:22 -0500, Jon wrote in message
[EMAIL PROTECTED]:
..another big deal to dig up: Downwash.
There may end up being some things that don't get specifically
addressed, but must be defined by the user with functions and tables.
What I'd like most to do is to provide
Using derivations very similar to those described by Jon in his latest paper, I
have managed having my Su-26 alpha model do most of these figures :
http://aerobatics.ws/acro_figures.html
The ones that still are a little dirty for me are the tailslide and sided
loops (the former because I
Hey toaster :-),
I love your idea of trying to simulate aerobatics correctly and I'd want
to try to help you once you're able to release the first version. I'm
not too familiar with flightgear (I'm only using it as a flight data
display) so far (especially not JSBSim, can't help you with
On Wed, 14 Jun 2006 22:12:31 +0200 (CEST), flying.toaster wrote in
message
[EMAIL PROTECTED]:
Now for a few questions :
- Are both half wings treated separately in JSBSim ?
..AFAIK, no, yasim yes.
..2 option for JSBSim, cut your Su-26 in 2, Su-26Left and Su-26Right,
or rewrite JSBSim with
Using derivations very similar to those described by Jon in his
latest paper, I have managed having my Su-26 alpha model do most
of these figures :
http://aerobatics.ws/acro_figures.html
The ones that still are a little dirty for me are the tailslide
and sided loops (the former because I
Jon S. Berndt wrote:
But, I'm also wondering if there is a way to obtain the same effect with a
three-dimensional table. Can someone give a detailed describption of a snap
roll?
My understanding of a snap roll is that at some speed (probably well
above traditional stall speed) you command
Jon S. Berndt wrote:
But, I'm also wondering if there is a way to obtain the same
effect with a
three-dimensional table. Can someone give a detailed
describption of a snap
roll?
My understanding of a snap roll is that at some speed (probably well
above traditional stall speed)
Snap roll:
This is indeed the recipe for a snap roll: starting from a speed slightly
above the stall, apply a sudden yaw with the rudder, apply opposite aileron,
and pull back on the yoke. SNAP! --- One wing stalls and the plane rolls
over.
[I liked the clever use of the word, recipe with the
Sorry about that, prematurely hit send. Here is the link:http://forums.x-plane.org/index.php?showtopic=13050st=0Might be interesting, or maybe even relevant to modelling things like snap rolls in JSBSim.
Regards,Hugo Vincent.On 6/15/06, Hugo Vincent [EMAIL PROTECTED] wrote:
I came across this
This would be hard to model using lookup tables, but it might be possible
using JSBSim functions and a table or tables, together. Could be
fun. I need
to think about this one. The first idea that comes to mind is that if the
aircraft speed minus the yaw rate times some characteristic lateral
On Wed, 14 Jun 2006 20:22:05 -0500, Jon wrote in message
[EMAIL PROTECTED]:
Jon S. Berndt wrote:
But, I'm also wondering if there is a way to obtain the same
effect with a three-dimensional table. Can someone give a detailed
describption of a snap roll?
My understanding of a snap
I came across this discussion about adding a new open source FDM to
X-Plane, using CFD methods to get really really high fidelity models.
On Wed, 2006-06-14 at 20:32 -0500, Jon S. Berndt wrote:
Snap roll:
This is indeed the recipe for a snap roll: starting from a speed slightly
above the
My understanding of a snap roll is that at some speed (probably well
above traditional stall speed) you command a large nose up
elevator deflection -- if you have enough elevator authority you
can quickly force the wing to a high alpha so that the wing stalls
(at a much higher
Jon S. Berndt wrote:
Partially right:
http://www.av8n.com/how/htm/snaps.html
Rudder is involved.
The link you quote describes a situation where you get into a snap
roll/spin when you don't want to. I had something similar happen when I
was looping my R/C cub and tried to tighten up
Curt,
I can do this in many of my R/C planes. Just pull back the elevator to
Ah, how come I haven't until now realized that you're into model
aircraft...? What a great collection of models you have, too.
First I accelerate to full speed and pull the aircraft into a vertical
climb, then I
Also note that if your left wing is dropping due to being on the edge of
a stall and you try to compensate with right aileron,
Right aileron as in trying to roll to the right?
that will cause the left side aileron to deflect down.
Left aileron TED follows from right aileron TEU. The pilot
This would be hard to model using lookup tables, but it might be possible
using JSBSim functions and a table or tables, together. Could be fun. I need
to think about this one. The first idea that comes to mind is that if the
aircraft speed minus the yaw rate times some characteristic lateral
Disclaimer: my degree is in computer science, I only walk through the
aerospace engineering department on they way to my driving simulator
lab. :-)
Jon S. Berndt wrote:
Also note that if your left wing is dropping due to being on the edge of
a stall and you try to compensate with right
BUT! Had I known then what I know now and steered with the rudder
rather than the ailerons, it probably wouldn't have been nearly such a
close call.
There are a few very spectacular inadvertent stalls and spins and
suchlike in this video as well. It's actually quite funny to watch:
Maybe said a different way, imagine your wing is riding on the edge of
the amount of air it can push down without stalling. Now you deflect
the aileron down and try to push the air down even more.
Stupid me. I forgot something. OK, deflecting an aileron is like deflecting
a flap. If you look
Jon S. Berndt wrote:
Snap roll:
This is indeed the recipe for a snap roll: starting from a speed slightly
above the stall, apply a sudden yaw with the rudder, apply opposite aileron,
and pull back on the yoke. SNAP! --- One wing stalls and the plane rolls
over.
[I liked the clever use of
On Wed, 2006-06-14 at 19:34 -0500, Jon S. Berndt wrote:
All this to say that it looks very good.
Now for a few questions :
- Are both half wings treated separately in JSBSim ? That can be
important for snap rolls, even though I do them day in day out now
Yes, I know. The
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