thanks lorbass,
I have update my parameters with the one you suggested.
Unfortunately I still have the same problem .
When in Qstabilize after some seconds of hover I loose control of pitch and the plane attempt to fly levelled after increasing motor speed.
I suspect because the pitch authority is poor , pitch correction via elevons is not enough .
Here is the log
https://www.dropbox.com/s/nwlzt42d7hshwxf/00000058.BIN?dl=0
I must take off holding the plane by hand because I need to adjust the yaw since it is not neutral .
How can I trim Yaw ?
Is it normal that when in Qstabilize , yaw command move the elevons only after take off ?