@johnfwhitmore wrote:
Newbie, just starting out and confused by the results of a fresh build of a 350 Quad copter with a Pixhawk flight controller. Once in the air, in stabalise mode, the quad vibrated back and forward badly in the roll axis. I fixed that by going into the advanced config/tune settings and reducing the Roll Angle P factor by 10%.
One point I would make about that was that the nice GUI interface documented on the web site bares zero resemblance to what was displayed in APM Planner 2 (Installed a deb for Ubuntu).
That's the Roll vibration sorted but I then switch into Loiter mode and the quad dropped out of the sky at a fairly constant rate to land on the ground. I'd say it was from about 10m (I've not sorted out log files as yet, have to read up and enable that) So that made me wonder do I have to configure Loiter mode.
That made me wonder what is the lazy flight controller doing? Surely the whole point of the flight controller is in the title. The Pixhawk has access to barametric pressure, and with a GPS lock it knows it's altitude. It also has accelerometers so why would I have to configure Loiter? Surely it has more then enough info to be able to set throttle to required settings to maintain its position.
That line of thinking brought me back to the vibration in the roll axis. The quad should know that it's oscillating back and forward in the roll axis. It should also know that this is not due to user input, as there is no oscillation in the transmitter input. No hand on that control so centered by default. So given that info surely it could decide that it needed to adjust it's control settings?
OK very basic questions and given I'm only starting out I know nothing so I'm just imagining how the system would work, in my head. Which is obviously totally wrong. Thank the maker that RTL worked as expected
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