### Thrust - stabilizer.thrust and height relationship

Posted:

**Tue Jul 23, 2019 11:23 am**Hello,

Using CrazyFlie 2.0 I am trying to find a relationship between the input thrust (that I type from the keyboard in python) and the output thrust, that the drone sees.

As for now I can't find any conclusive data as for an input thrust of let's say 40000, I get a stabilizer.thrust of 16384. However, when I input a thrust of 30000, I get an output of 24576 ( so it is bigger than the previous although the input thrust was smaller).

Even more surprising is when I input a thrust of 20000 and I get the same output thrust of 16384(that was for 40000) and also for an input thrust of 15000 I get 24576 as an output (the same as for 30000).

Why do I try to figure this out?

Basically I want to find a relationship between the thrust that I introduce from the computer(in python) and a certain height. However, my final purpose would be finding a function of thrust based on height, so that the input thrust would change depending on the changes of height. ( I don't use any joysticks, just python).

I know about the Kalman, however my thrust function is something like this:

thrust = thrust_offset + Kalman_feedback

To be more precise, that "thrust_offset" is the unknown variable for me. How should I choose that based on the height

Do you have any suggestions on what I should do?

Using CrazyFlie 2.0 I am trying to find a relationship between the input thrust (that I type from the keyboard in python) and the output thrust, that the drone sees.

As for now I can't find any conclusive data as for an input thrust of let's say 40000, I get a stabilizer.thrust of 16384. However, when I input a thrust of 30000, I get an output of 24576 ( so it is bigger than the previous although the input thrust was smaller).

Even more surprising is when I input a thrust of 20000 and I get the same output thrust of 16384(that was for 40000) and also for an input thrust of 15000 I get 24576 as an output (the same as for 30000).

Why do I try to figure this out?

Basically I want to find a relationship between the thrust that I introduce from the computer(in python) and a certain height. However, my final purpose would be finding a function of thrust based on height, so that the input thrust would change depending on the changes of height. ( I don't use any joysticks, just python).

I know about the Kalman, however my thrust function is something like this:

thrust = thrust_offset + Kalman_feedback

To be more precise, that "thrust_offset" is the unknown variable for me. How should I choose that based on the height

Do you have any suggestions on what I should do?