A friend of mine built a Kissed Alien with Lumenier 2205 2350KV motors and a gopro 3 in the front but we have a hard time tuning that quad. The FC is flashed with the latest (RC28?) kiss software and the ESCs (24A) also run latest and greatest. It is a setup which is werry similar to what Finalglide is using, and by watching one of the latest videos from Joshua Bardwell, he had a similar setup but with emax red bottoms instead, and it flies good with Finalglides PIDs, so he propose to just use them to get it to fly. I know that different setups need different PIDs, but it shouldn't be that much off.

The problems seems to be the Pitch axis as when raising P higher than 4.5 it starts to oscillate at mid-throttle and increases with the throttle. 

Finalglide PIDs
Roll 4.3    0.037    11
Pitch 7.1   0.038   18
Yaw 9.8    0.05     4
TPA 0.45   0.2     0.4 
LPF Off


From my experience with Betaflight, you can raise P quite a bit before seeing major oscillations, but with the Kiss it goes from sloppy to oscillating long before you get that "locked in" feeling. I told him to try out Betaflight 3.0 on it, which he will, and see if that solves anything.

I find it strange that Kiss is so hard to tune, isn't that why it is called KISS - Keep It Super Simple?

I have been thinking hardware error, but I can't find anything out of the ordinary with his gear. The motors are smooth, new HQ props, FC is fixed on nylon standoffs with some O-rings. all the bolts are thightened up.

I have no previous experience with kiss, but maybe someone here have some tips on how to tune this bastard of an Alien?

I found I have to lower my gains quite a bit on my QAV-X with full kiss. and looking at your settings, have you tried using the LPF, maybe set it to high?

(30-Aug-2016, 03:08 PM)JimmyLe813 Wrote: I found I have to lower my gains quite a bit on my QAV-X with full kiss. and looking at your settings, have you tried using the LPF, maybe set it to high?

Yeah, tried the filter on high and medium, but the oscillations just get worse

Maybe Aliens don't like to be kissed on the chin? haha just kidding.

I noticed with KISS setup that, rate/expo actually affects your PID as well.
Before when my rate/expo wasn't setup correctly, the quad just oscillates no matter how low I set my PID...
Try this : Rate 0.84 RC Rate 0.85 Expo 0.03 and let me know if it does anything

you might need to play with Rate /expo to get it perfect for you quad

These are the rates he is using. They are copied from mr. Steele

Rates:
Pitch/Roll: 1.11 0.8 0.04
Yaw: 1.25 0.7 0.04