Here's your exact same numbers:

+1 accelerator.
-1 1st turn.
--------------------- = 0
+1 2nd turn.
+2 accelerator.
-3 1st turn.
--------------------- = 0
+3 2nd turn.
+3 accelerator.
-6 1st turn.
--------------------- = 0
+6 2nd turn.
?
?

Total resultant force = 0 + unknown last section which is probably zero too.

the pipe does't move because of the zero force.

as far as I am concerned I have won this discussion because
of my use of non - fictional forces and numbers , you have done nothing but try to use fictional forces and went as far as adding up those fictional forces to arrive at fictional numbers.

I dont think that anything you could post would prove me wrong , so given that you cheat.

I win the discussion and you loose.

reactionless propulsion is a fallacy.