On 18/06/12 23:56, Felix Ruess wrote:
Hi Tilman
since we don't really have one standard airframe setup for
beginners I would propose to make the Bixler that one (with
Lisa/M 2.0 and Aspirin 2.1).
The gains are not tuned (I don't have a Bixler), so this is
just a start... you also need to make sure the servo defines are
ok for your airframe.
I'll be happy to update that example if you have a known-to-work
config...
Sure, I will keep you posted.
If I don't crash it too soon. :)
But my plane is not quite original, I moved the rudder servo in the
tail fin which moved a lot of the weight to the far back. In
hindsight not such a good idea, but I did not like the long pushrod.
Also my Motor and ESC are not original. But tuning speed settings
should be harmless do do. The heavy motor adds to the tail
heaviness. I will have to put a lot of lead in the nose.
It is probably better for you to start with a basic setup
before you start adding/using some additional options and
picking random stuff together from other airframe files...
So in that example the IMU, AHRS and control runs at the
default 60Hz. You can do better if you increase that, but that
adds more complexity in configuration...
About the aileron diff... I guess it is nice but probably not
really needed in most cases (I didn't add it in the example to
limit confusion).
The adaptive control is not especially documented so far, but
you probably don't gain that much by using it if you don't have
an airspeed sensor...
To use it you would have to specify the type="new" for the
control subsystem.
Ah, "adaptive" is "new". Thanks.
Maybe later then when I have a airspeed sensor.
It would be really nice if we could get _one_ example setup
that is know to work really well. The Bixler is probably a good
choice there, but the drawback is that probably none of the
really experienced Paparazzi's has one? But it should be similar
to an EasyStar (but with ailerons).
It's kind of cheap enough to buy it just for that reason.
If there is general interest in getting this frame good, then we
could even share the cost so that someone who actually knows what he
is doing gets his hands on it. :)
Would be good to update that example with your final tuned
values once it flies well so the next one with a bixler doesn't
have to start tuning again...
I think that is a excellent idea. That model is cheap and versatile
and can carry some payload.
Also, fitting the electronics is super simple with this FPV mount
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=22731
(Far away from the CG. But that is hard to avoid with such a long
plane.)
It has quite swept wings. Is that rather good or bad for paprazzi?
Thanks. I go with defaults.
Anyways it would be good to get some input from some
fixedwing people on a standard setup...
Cheers, Felix
On Mon, Jun 18, 2012 at 9:39 PM, Tilman
Baumann
<address@hidden>
wrote:
My Bixler
Airframe is nearing completion.
But I'm absolutely overwhelmed by the number of magic values
in my airframe file.
I based my config on another 5 channel airframe I found in
the sources. Whic was basically cargo cult configuration.
With this I copied a lot of things that are probably
absolutely wrong for my plane.
I tried to reduce those magic values to a minimum but it
does not seem to compile with many of those. I commented out
a bunch but there is still a lot left.
For most of those values a Wiki search brings no results, or
no indication for safe defaults.
I'm sure that I have to eventually do some tuning. But I
would like to do this incrementally and based on some sane
defaults.
Also there is stuff like aileron mixing in the command laws.
They look cool. But should I use that or better not?
And this mixing of rudder and ailerons also happens in
MANUAL mode. Good?
Also there is this adaptive control loop. Is that on by
default? I don't find options for it. Or should I not use
that anyway?
I pasted a copy of my config. You see all the FIXME and the
commented stuff.
http://piratepad.net/FSUEQOzM99
I suppose I have to do a lot of tuning. But perhaps if any
of you see some big no-no's there or like to comment on
choices I have taken (or rather ignored).
I would hate to start with a totally botched up setup. Would
be nice if it actually flies. :)
Comments welcome.
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