Help with plane

Hi!!
So, I am basically trying to make this plane goes slow down,up acording to the angle

local de = ((Mainpart.CFrame.LookVector.Unit) * Speed)
			local Speed = Force.Force.Magnitude
			local Calculate = (de.Y - 6) 
			Force.Force = Vector3.new(de.X,Calculate,de.Z)

That’s the code, but, for some reaosn this happens:

https://gyazo.com/ed41da84349cc968ba638b34503630c3
It seems it can only go forward no clue why

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I don’t really know what’s causing it :thinking:

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Could you elaborate? What you are trying to achieve is quite unclear.

I fixed it, sorry
Thanks though