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Quadcopter rotates too slow

When I flew my drone yesterday, all the manoeuvres I did felt really slow. I then went into the OSD and changed the rates a bit. The drone then acted as it should, but when I then changed back it still felt fine.

When reviewing the blackbox logs afterwards I noticed that the gyro only registered around 340 deg/s rotation at full stick deflection (See the last part of the bad blackbox log)

After going into the OSD to change what I said above, the rotation speed was 900 deg/s at full stick deflection, as it should be with the rates I have.

To clarify a bit: It felt like I was using rates that were much lower than they actually were. The problem disappeared when I went in to the OSD menu and out again, but the next day I had the same problem again. It is not a major issue as it is easily fixable, but I would be glad if I could get some help to figure out what the problem could be.

The flight controller uses betaflight 4.1.

Here is a link to the blackbox logs.

One Answer

I think this problem had two different reasons; two screws that held the flight controller were a loose, and there was likely a problem with the connections between the gimbals and mail board on the transmitter.

The screws that were loose were both on the same side, which caused the FC to "lag behind" the movement of the quad and thus giving false values to the PID-controller. At least that is my theory.

The problem with the transmitter was not as obvious, but I whan looking at the reciever tab in Betaflight Configurator, I noticed that the roll channel acted almost as if it was smoothed. Even if this wasn't visible in the radio I still tried to unplug and replug the connectors to both of the gimbals, something that was recommended on a few forum threads I found.

Correct answer by Hannes Hultergård on August 19, 2021

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