How to make the rocket fly for video?

Hello! I am a beginner in UE4, and I try to learn how to make a realistic rocket (i will make a short video of rocket launch).
I made a Blueprint actor (My rocket mesh with particle system - rocket fire), then I created another Blueprint actor and added a spline in it - in the event graph I made such script http://joxi.ru/Dr86dv9f4Bk7V2 (I shoose Rocket Blueprint in viewport as “Actor to animate” variable). The problem is that when I push “Play” the rocket Blueprint dissapears and does not move (cause it dissapeared)… Also I tryed to pot Spline inside the Rocket Blueprint, but unsuccessfully.

Can you please help me? Please explain the simpliest way to make the rocket move upstairs with increasing velocity? Maybe there is another way…