EDIT: just forgot to save my ccp file 
DELETE THIS POST
I can’t get the property to work
C:/Users/antto/Documents/Unreal Projects/Tuts/Udemy Cpp Curses/04_BattleTank/BattleTank/Source/BattleTank/Public/TankBarrel.h(22) : Error: Unrecognized type ‘MaxDegreesPerSecond’ - type must be a UCLASS, USTRUCT or UENUM
Maybe that’s a bug from 4.18.2 I use actually but if someone can help …