Why can't you just accept that this time you're wrong. Put your turbine on the front of your jet with the tailcone pointed down and you've got up thrust. Put that same turbine on the back in the same configuration and it is now down thrust. This has been discussed over and over. No need to get your feathers ruffled.
So a turbine pointed up at the front will go up but if bolted at the same angle on the back it will go down?
You are getting things mixed up Thrust is a Reaction force, it is the direction it makes it travel, up/down/fwd/back so 'up thrust' is 'up thrust' no mater if it is at the front or the back of an aeroplane.
Thrust is the direction the push that the prop or turbine develops.
Again back to the rocket, point it up and let go and it will go up, because the reaction of the jet/power/air/thrust (whatever you want to call it) out the back pushes the rocket up, this is called up thrust.
If we bolt our rocket on the front of an aeroplane and point it straight up, and to keep woketman happy, the rocket produced more power/thrust than the weight of the aeroplane, the aeroplane would go up, whether it was bolted on the front middle or back.
Point it up at 45 deg it would still go up at 45 deg. This is the direction of the thrust.
Whether a model needs up thrust or down thrust is a trimming issue, and depends on each plane, but thrust direction dos'nt change just because it is at the back, the engine angle may do, but the engine angled down at the back is not producing down thrust unless the propeller, jet blast is going out the other way in which case the aeroplane would fly backwards