[Paparazzi-devel] motor current calculation ?

[Chris]

Hi.
I was watching my plane's current draw at various throttle levels  and 
it looks like the calculation is a bit off.
When the throttle is at 50% the current draw is ~25% of the:
<define name="MILLIAMP_AT_FULL_THROTTLE" value="40000"/>
It is logical since at 50% rpm the propeller only produces 25% of it's 
full rpm power.
Here is what i used instead in main_fbw.c file (broken down for clarity):
#if ((! defined ADC_CHANNEL_CURRENT) && defined MILLIAMP_AT_FULL_THROTTLE)
#ifdef COMMAND_THROTTLE
    float percent_throttle = 
(float)commands[COMMAND_THROTTLE]/(float)MAX_PPRZ;
    percent_throttle *= percent_throttle;
    fbw_current_milliamp = Min((percent_throttle * 
(float)MILLIAMP_AT_FULL_THROTTLE), 65000);
//    fbw_current_milliamp = Min(((float)commands[COMMAND_THROTTLE]) * 
((float)MILLIAMP_AT_FULL_THROTTLE) / ((float)MAX_PPRZ), 65000);
#endif
#   endif

Is this correct or i am doing something wrong?