Thanks for your answer !
I was able to easily adapt the sight radius.
About the velocity of the takeoff, it seems that the vertical acceleration stays the same even if I set it to a very low number. The get forward vector changes the direction, but not the speed. Are these variables affecting only the vector direction of the takeoff off maybe ?
Oh yes, you may want to adjust the Jump Z on the Parent Class Blueprint as well. In the Parent Class Folder open “BP_NPC_Bird_Base“ in the character movement section find the Jumping/Falling area (See Image)
That should do it in addition to the velocities in the Task. Hope that helps 
Yes, that worked, thanks !
I also changed the target from wich the vectors are taken and replaced it with the character controller, so the birds fly away from my character instead of their direction.
I might have a few questions in a few days, but right now, it works the way I want.
