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[Paparazzi-devel] Re: MILIAMP_AT_FULL_THROTTLE

From: Stephen L Hulme
Subject: [Paparazzi-devel] Re: MILIAMP_AT_FULL_THROTTLE
Date: Wed, 17 Jun 2009 18:04:40 +1200

Christophe wrote:
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 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,

Dear Christophe
Can I assume that the updated ~funjet1.xml file showing: Define name="MILLIAMP_AT_FULL_THROTTLE" valve= "2000"/> 
should be changed to say: Define name="MILLIAMP_AT_FULL_THROTTLE" valve="10000" unit="ma"/>, in the first instance
if I am running an AXI 2212/26 motor specified to draw a maximum efficiency current of 10 amps. 

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