RE: [Paparazzi-devel] Re: MILIAMP_AT_FULL_THROTTLE

[mark.griffin]

Just to let you know that I updated the Wiki with this useful information. See: http://paparazzi.enac.fr/wiki/Airframe_Configuration#Bat

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From: address@hidden [mailto:address@hidden On Behalf Of Christophe De Wagter
Sent: Tuesday, 16 June 2009 11:08 PM
To: address@hidden
Subject: [Paparazzi-devel] Re: MILIAMP_AT_FULL_THROTTLE

Dear Joekadet,

MILLIAMP_AT_FULL_THROTTLE is the actual current flowing out of the battery in milliampere when the plane is full throttle. The autopilot uses it to integrate how much power is consumed out of the battery and sends it down in the bat.enery. This value can also be used in flight plans. So if at full throttle your motor consumes 10 Amp, fill in 10000. At 50% throttle it is likely to use about 5Amps so the autopilot can have a better idea how much power is left. You can "tweak" this number after a few flights to match the capacity of your battery. If upon landing your bat.energy messages says that you used 2500 mAh while the battery is only 2000mAh you could reduce the MILLIAMP_AT_FULL_THROTTLE by 20% to match your in-flight current consumption. 

To be accurate, the throttle servo setting should be correct. Also be aware that current to throttle is not 100% linear, and that full throttle often uses less milliampere in flight than in a static setup. 

 

Hope this helps,

Christophe

---------- Forwarded message ----------
From: "Joseph Schauber" <address@hidden>
To: <address@hidden>
Date: Mon, 15 Jun 2009 17:45:28 -0500 (Eastern Standard Time)
Subject: [Paparazzi-devel] MILIAMP_PER_PERCENT deprecated ... please use MILIAMP_AT_FULL_THROTTLE

After a svn update I'm getting a warning when I build a airframe in Paparazzi Center

 

... #warning "deprecated MILIAMP_PER_PERCENT --> Please use MILIAMP_AT_FULL_THROTTLE"

 

Is this actual ma draw of motor at full throttle, a percentage, or just how is it used?

I take it that the wiki explanation no longer applies.

The svn airframe file  funjet1.XML was changed 6 days ago to :

Define name="MILLIAMP_AT_FULL_THROTTLE" valve= "2000"/>

The svn airframe file microjet5.XML was changed 3 weeks ago to :

Define name="MILLIAMP_AT_FULL_THROTTLE" valve="11000" unit="ma"/>

 

Any help is appreciated

 

Joekadet