so anyway i finally got my 4s 5inch back in the air after replacing a motor and thought id do a quick betaflight tune while i was at it. ran the RPM filter, did a blackbox log, adjusted the PIDs based on what i saw ? nothing crazy, just bumped P up a little on roll and pitch and lowered D a bit because it was feeling sluggish.

now the motors are running noticeably hotter than before, like uncomfortable to hold after a 4 minute pack. before this tune they were barely warm. i havent changed anything else, same props (hq 5.1x3.1 tri-blade), same 4s 1500 packs, same flying style.

blackbox is showing some oscillations but i cant fully read it well enough to know if thats the cause or something else. i feel like maybe i messed up the D term but i genuinely dont know. anyone dealt with this before?

yeah almost certainly a D term issue or your filters got messed up somewhere. hot motors after a tune are basically always either D too low letting high freq oscillations through, or the RPM filter not being configured right for your actual motor KV and prop combo. what KV are the motors and did you set the motor poles correctly in betaflight before running the RPM filter? thats a gotcha that gets people all the time ? if the pole count is wrong the notch filters end up in the wrong place and youre basically running without filtering on the harmonics that matter.

also lowering D when it felt sluggish might have been the wrong call ? sluggishness is sometimes too much D but it can also just be P being too low or your throttle curve. hard to say without seeing the actual log but id start by double checking the RPM filter setup before touching PIDs again

honestly just post the blackbox log somewhere, way easier to tell whats going on. plasmatree PID analyzer will show you the step response and youll see pretty quickly if its D oscillations. my guess is youll see a spiky D trace in the roll or pitch channel but im just guessing from what youve described. happened to me on my last build and it was exactly that ? dropped D too aggressively and the motors were cookin within two packs