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Originally posted by bobbles
a plane has passed through this vortex and its engine has entered the tangent universe
Yes, the plane is the Artifact Vessel. In the book, Roberta says that metal is the (transitional) element for the construction of Artifact Vessels.
Originally posted by bobbles
as it landed on donnie's bed he has been chosen to return the engine back to the primary world before the tangent world collapses creating a black hole
Yes, but Roberta says:
"The Living Receiver is chosen to guide the Artifact
into position for it's journey back to the Primary Universe.
No one knows how or why a Receiver will be chosen. "
Although we might assume that Donnie is chosen by God.
Originally posted by bobbles
all those around without knowing it are manipulated into guiding donnie
Yes, these are the Manipulated Living.
Originally posted by bobbles
those who die in the tangent world have special powers such as the ability to time travel and they use this to guide donnie in his quest ie frank and donnie's mrs
No. No one dies in the Tangent Universe (unless they are killed or murdered etc). It's a parallel universe so people exist in both simultaneously. Thus, everyone exists in the Tangent Universe and the Primary Universe in parallel. Separate instances of the same person if you like. That is why a vortex between the two is so dangerous.
END OF SPOILER