Since I couldn't find the answers anywhere: Engines

`v ∝ E/n`

v = ship speed going forward

E = number of engines

n = number of hull tiles placed

"n" is the number used to calculate CM cost, which is not affected by:

Unfortunately, there is no way to see "n" directly in the ship editor -- you would need to either count directly in the editor, or reverse-engineer the CM cost formula.

EDIT: Unless your hull consists entirely of unarmored square tiles.