This is not the first time i tune the harmonic Notch, but its the first time i cant figure out whats going on.

This is a 690 frame with a Cube Orange Plus. I have verified that my frame does not have flex, my cube is screwed on properly, all cables secured and not jumping around. Propellers are verified to be balanced and still i cant make sense of it. 17" Props and my initial params set same as always.

So far pid is bad, but good enough to perform stable hover in order to find Hover throttle and small 1-2 minute flights to run FFT on all 3 imu so i can tune my harmonic notch filter. But still i can figure out what am i doing wrong with this one. I have taken it apart a number of times to check that all parts are in proper condition and everything works as it should and here are my pictures and logs.

All Logs in this link and names can be seen on the FFT pictures. Logs FFT 690 Issue - pCloud

I take of with my HNTC Frequency set to 56 as i had found from my last flight and here is the result.

On this my Y and Z vibes average between 11-12 on Imu2 and X around 5

IMU0 X 1,6, Y 2,2 and Z 5,5

IMU1 X 1.7, Y 2.3 and Z 3.8

On which i realized that i had forgotten mu mode to 4, when it should of been 1.

Same HNTC with correct Mode (Set to 1 for throttle, but still my REF value is Hover Throttle*0.6 as i had seen on a post here)

I could see instantly that my Gyro on FFT changed frequency. Peak on IMU0 is 44hz the cube sweatspot, IMU1 is 90 which is another cube sweatspot and IMU2 is at 324hz

Dropping down to 44hz *the log is FFT 56hz _mode1 test.bin) and my vibes as follows.

IMU0 all axis below 10, but at some point X jumps to 80 or so and Clipping starts kicking in)

IMU1 Same as IMU0

IMU2 X and Y average arounf 10-12 and Z at 9 and NO CLIPPING

Next round was to start from scratch by disabling Harmonic Notch. High Peak on IMU0 was 46Hz and the log is Disabled INS_HNTC.bin

This was not even a flight is was takeoff and also instant land since clipping kicked in on IMU0 and IMU1.

And from what i understood so far is the Vibes are within reason but the frequency is right where is the Cube isolation Cant take it and goes Haywire.

Enabled HNTC at 46hz and Mode1 with Ref at 0.26 which is my hover throttle and my FFT looked like this:

On which i have not two minor peaks at 56 and 107hz on Imu0, almost similar on IMU1 and a really low amplitude on at 105hz on Imu2. which is similar to all other tests i have done so far when i use a harmonic between 43 and 46hz.

Log is 690 Flight test 46hz.bin

Vibes:

IMU0 X lean 3.2, Y 3.2, Z 8

IMU1 X3.3, Y3.5, Z8.8

IMU2 X8.8, Y14, Z11.6

Would the Harmonic GODS here suggest i have my Harmonic at the 46hz and add s static at 105, or the proper way would have to be the other way around since from my test i conclude that my frame harmonics are on the Cubes isolation frequency?