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

From: Steven Wawryk
Subject: Re: [Paparazzi-devel] Maximize climb rate after take-off
Date: Mon, 11 May 2009 16:15:05 +0930
User-agent: Thunderbird (X11/20090318)

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.


Famille Chateauvieux-Hellwig wrote:
Hi Steven
do you have a Pitot or another airspeed sensor?


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

* 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


address@hidden wrote:

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 ?


----- 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


I'm working with David Bryant on the compressed air cannon launched

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

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?


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