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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 15:54:53 +0930
User-agent: Thunderbird (X11/20090318)

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.


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 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?


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