our momentum would absolutely be preserved.
I am contesting this assertion (with the pool analogy etc.). Why would it be?
Why do you think that objects in the Warp move like objects in the Materium? Conservation of momentum and every other physical assumption breaks down when you enter the warp. There's no reason to assume that you'll have be traveling at any particular speed in any particular direction when you leave, regardless of your disposition when you entered. It's your teleportation technology or your psychic powers that are effecting the warp-transition and the adjustments necessary to eject you where you will rematerialize, not your own physical movement.
Because when you move into the Warp with a regular ship, you are doing so with your own, Materium-generated, momentum.
If the Warp exerted an immediate force that somehow dissipated your momentum or changed the very definition of what momentum is, a ship would be immediately twisted, pulled apart or otherwise affected when any part of it entered the Immaterium. It is also debatable how it would even generate any momentum to move while in there, to get to where it needs to go.
The preservation of momentum is necessary for there to even be open rifts in the first place. Like I said, however, this doesn't mean that there cannot be other forces within the Warp that acts upon your pre-existing momentum - the water in the pool, so to say; it might be harder to move in there, it might be easier to move in there, or there may even be cascade storms consisting of cluster headaches and the colour apple.
Furthermore, any jaunt into the warp needs to be shielded in one fashion or another. Gellar Fields do this by preserving an "island" of realspace around the ship, preventing the laws of physics from going bananas (sometimes literally). Unless I read my textbooks in high school physics wrong, this would include momentum. More likely than not, anyone without protection identical or similar to this would be instantly torn apart or otherwise adversely affected (your spleen is now cinnamon, said the GM and cackled).
Ok. Did you take into account the momentum of the ship you might be teleporting from in the future? Will your characters come teleporting in at 15 km./sec.?
Seriously, if you start applying reality to 40K, you're going to be in serious trouble. Just go for the Rule of Cool and steer clear of Monte Haul.
Depends, really. This might be one of the main reasons teleporters and teleportariums are so very uncommon. Any kind of teleportation that shoots you through the warp would have to take this into account, which might explain why 99% of Adeptus Mechanicus attempts to replicate the technology has ended up with the servitor smushed against a wall.
Edited by Fgdsfg, 22 July 2014 - 03:07 AM.