Strange autotune behaviour on large Y6 (28in prop)

@JMare wrote:

Hi,

Come across some strange behavior trying to autotune a big y6 with Pixhawk 2.1.

Autotune is setup as a CH_7 option. Procedure was as follows:

Takeoff in stabilize, switch to alt-hold, engage autotune. Ground station reports "autotune started" and shows flight mode as "autotune"

Every time the pilot positions the copter and releases the sticks, the copter will do one twitch and then stop. It will not twitch again until the pilot again moves the copter and then releases the stick.

My initial thought was bad stick centering, but we have tried now with futaba and with taranis, and have double checked there are no trims or anything that should stop it centering.

Aircraft is a Y6 using Tmotor U10's and 28*9 inch props.

Does anyone have any suggestions?
Logs are here: https://dl.dropboxusercontent.com/u/101318664/autotuneissue.BIN

Cheers

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