Re: [Paparazzi-devel] Maximize climb rate after take-off

[Steven Wawryk]

Hi Martial,

Well, not yet.  I would like to put one in.  In the meantime, I plan to add a 
margin to the groundspeed set-point to allow for a level of wind, and limit 
launch to windspeeds below a threshold.

Cheers,
Steve


Famille Chateauvieux-Hellwig wrote:
> Hi Steven
> do you have a Pitot or another airspeed sensor?
>
> Martial
>
> Le lundi 11 mai 2009 08:24:53 Steven Wawryk, vous avez écrit :
> > Hi Pascal,
> >
> > For example, the MicroPilot autopilot allows the use the following
> > alternatives:
> >
> > * airspeed from throttle and altitude from pitch
> >
> > * altitude from throttle and airspeed from pitch
> >
> > depending on which of altitude or airspeed is to be most tightly controlled
> > in the current mode.
> >
> > In my case, throttle is set to max to increase altitude as quickly as
> > possible.
> >
> > Cheers,
> > Steve
> >
> > address@hidden wrote:
> > > Hi,
> > >
> > > If you don't set nor a climb rate (vmode=climb) neither an altitude
> > > (vmode=alt), what do you want to control with pitch=auto ?
> > >
> > > --Pascal
> > >
> > >
> > > ----- Original Message -----
> > > From: "Steven Wawryk" <address@hidden>
> > > To: address@hidden
> > > Sent: Monday, 11 May, 2009 04:19:36 GMT +01:00 Amsterdam / Berlin / Bern
> > > / Rome / Stockholm / Vienna Subject: [Paparazzi-devel] Maximize climb
> > > rate after take-off
> > >
> > >
> > > Hello,
> > >
> > > I'm working with David Bryant on the compressed air cannon launched
> > > system.
> > >
> > > What I would like to be able to do in the flight plan is to go into a
> > > maximum climb rate mode straight after launch until a given altitude is
> > > achieved.
> > >
> > > What I'd like to be able to do is something like:
> > >
> > > <attitude roll="0.0" pitch="auto" throttle="1.0" vmode="throttle"
> > > until="estimator_z >= ground_alt+security_height"/>
> > >
> > > the aim being to use pitch control at maximum throttle to achieve a given
> > > airspeed set-point.
> > >
> > > I'd rather not have to set the pitch or climb rate because then I'm just
> > > guessing what airspeed it will go at.  Too low and it will stall, too
> > > high and the higher drag means it won't climb as fast as it could.
> > >
> > > The problem is that the flight plan build doesn't allow auto-pitch with
> > > throttle vmode.
> > >
> > > The other vmodes don't seem appropriate, and with the default alt vmode,
> > > the build also fails because an alt attribute is needed.
> > >
> > > If I set the alt attribute, I'm not sure how it will behave.
> > >
> > > Is there a reason for prohibiting auto-pitch with throttle vmode?
> > >
> > > Does anyone have any other ideas?
> > >
> > > Thanks,
> > > Steve
> > >
> > >
> > >
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> > >
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