I want to move players fast for short distance

OK , I see . U want to boost in a specific direction , but You have made a mistake in its calculation .

  1. You forgot to feed in you boost direction arrow component , as I can see
  2. And you need not its location but its forward vector - it is a normalized vector which you should multiply on value of your boost strength and then add this multiplied directional vector to your actor’s location.
    Like this
    [Desktop 2018 11 19 10 51 44 01 - YouTube][1]