Removing Hipper's rear turrets does not yield free speed

How much speed would an Admiral Hipper-class cruiser gain by removing both rear main turrets?

Probably less than expected, because the ship would need ballast or a wider rearrangement to restore trim; displacement and speed do not relate as simply as vehicle weight on land.

The rear turrets are part of a carefully balanced hull, so removing them shifts weight distribution and may require ballast that gives back much of the apparent saving. Ship speed depends on hull form, displacement, and power rather than weight reduction alone.