Sub-space has nothing to do with "riding gravity waves" as mentioned earlier in this thread.
Here are the actual [V] facts on how sub-space within the FreeSpace universe works:
Artificial jumps do not have power requirements to operate outside of a gravity well, the denser the well the more powerful a sub-space jump is.
Natural sub-space nodes exist in regions of space, within FS and FS2 inter-system nodes are the ones used, intra system nodes may exist but are rarely used with the artificial drives.
Artificial and natural drives are seperate devises, the drives fusing these technologies (such as used during the Altair expedition during the Great War) are not cost-effective on fighter craft frames. Capital ships use both the inter system and intra system drives. (natural node and artificial)
Ships when activating the drive vibrate at a frequency which excites a sub-space node, activating it.
Sub-space is N-dimensional.
Each vessel enters it's own sub-space corridor in N-dimensional space. With sub-space tracking ships can enter an existing jump with another vessel.
The pre-existing vessel powers the corridor, and if destroyed in the jump will cause the node to collapse.
Sub-space nodes can be collapsed with high-yield explosions such as a ship loaded bow to stern with Meson warheads, or the power output of five Shivan capital class fusion reactors such as the ones on the Lucifer.
Whether a node is line or sight or not is neglible, no technologies within the FS universe can interdict a vessel within sub-space as it is within it's own corridor and can only be tracked if a vessel observed it's jump into sub-space.
Technologies may be able to interfere with a vessel entering or exiting sub-space, the latter could prove deadly as the ship loses power to maintain the corridor.
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AceStaff member FreeSpace Watch
http://freespace.volitionwatch.com/