one thing to consider in re drives... the drives appear to be (based upon Bk2 and Bk5) comprised of discrete modules. It is entirely possible that those drive chunks on a Type A may be entirely compatible with the same chunks on the larger type P or T ships.
Keep in mind that JDrives under bk2 are 5Td chunks...perhaps each chunk is a reactor unit and converter unit in a sealed combination.
Keep in mind that JDrives under bk2 are 5Td chunks...perhaps each chunk is a reactor unit and converter unit in a sealed combination.