Z-axis vibration observed during hover flight.

General
1

Hi everyone,

I’m flying a drone with a 140 kg AUW, and during my last two flights, I observed extremely high Z-axis vibration, which is causing noticeable altitude variations during flight.

In Mission Planner, the vibration graph shows the Z-axis vibration reaching around 99.37.

I’m currently using 56-inch propellers.

Has anyone experienced a similar issue on a heavy-lift/coaxial multirotor? If so, I would really appreciate your suggestions on how to identify the root cause and correct this vibration issue.

2

The root cause is that the frame is not stiff enough, and that the props are too close to the arms.

3

“Yeah, that’s true! My ESCs are mounted very close to the props. Can you suggest something I can change immediately, without modifying the overall design, to reduce the Z-axis vibration?”

4

Do you have any pictures? Of the arms, of where the avionics are mounted to the frame?

5

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