Crash after autolaunch INAV 4.1

[zoran-grujic]

Model is:
Wing, no tail, Phantom FX-61
MATEK F765-Wing
INAV 4.1
LOG00171.TXT

After catapult launch it gained altitude up to 80 m as it should, and then went directly down. After autolaunch it went into angle althold mode - like was set. It was terrible impact. Lot of damage. LiPo battery smashed - no fire I was lucky.

Possible issues:
Wrong CG
Failed servo
Bad settings after upgrade from 4.0
Software issue - heading data looks erratic

Any suggestions?

[stronnag]

The profile of the climb is strange, with the two steep sections. I expect it stalled at the apex (speed below 4 m/s). The darker points are launch, the lighter cyan angle / althold.

[zoran-grujic]

Can this happen if the plane was too nose heavy? It is also unexpected that it could not recover from the stall from 80 m high point. You are right the climb angle was strange, first too large, then sort of getting too flat. Different from my normal launch...