Obviously bad data does not give a better results. It is either repeatedly going back into restart mode or it is blatantly bad data. In either case you are just adding noise and messing up your fit over the good data.
There is nothing abetary about cutting out the data I chose to cut out. I chose that point assuming the ESC is still going in and out of start mode there. You don’t want the controllers to have to deal with that as it increases the load on the ESC and increases the chances of sync loss.
Given that you are not actually measuring the thrust curve here and I can’t actually tell if the motor is stuttering or if it is a bad current measurement this is just an exercise to demonstrate to other users how to approach the problem.
Statements like this make me wonder if you actually understand why we are doing this at all or if you are simply having fun trying to get a rise out of me. If you don’t understand I am happy to try to explain it to you in simpler terms. (see what I did there)
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For the benefit of others
-The process is define the minimum thrust level that will result in reliable operation of the esc/motors. To do this you need to get the motor/esc on a thrust stand and do step increases from minimum throttle to mid and max throttle. This defines the MOT_SPIN_MIN. You should also consider your ESC settings to ensure reliable operation during these tests.
-Then plot your thrust curve and check for a flat spot at the top of the ESC throttle range. If you have this set MOT_SPIN_MAX to take it out.
-Finally you set MOT_THST_EXPO to get the best fit of your thrust curve between MOT_SPIN_MIN and MOT_SPIN_MAX. There are some instances where there is an unusual thrust curve that this simple equation does not fit well to, often caused by over powering the prop. In that case you need to consider where in the thrust curve you will be operating generally and consider choosing a curve that does not increase the gain of your pid loops over the throttle point where you do your tuning.
For most people this isn’t necessary unless you are working with a wide range of take off weight, or are building a racing aircraft (think of it as TPA for racers).
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Yeh I called it EXPO because I thought people would relate to it through the EXPO function in their Tx. The equation is based on physical reality of propeller thrust vs voltage drive with some loss. That is why the single value approach works well. Thankfully the same equation can be still used when starting from a non-zero minimum thrust.
Oh, you do like to cause trouble don’t you 