I was wondering if anyone would be willing to try to calculate the values for the Excalibur's weapons yields based on the scenes starting in the links below. In the above link, the main guns are seen destroying a Drakh Cruiser (measuring at 3,316 meters based on official statements by Tim Earls) as well as carving across the side of a Drakh Mothership, which carries said cruisers on board and has a stated length of 59.69 kilometres. In the below links is a demonstration of the main guns: My apologies for the quality of the video, but the scene demonstrates the ability of the main gun to blast through an entire line of Drakh ships effortlessly. The second link is of most interest. This is when the Excalibur's crew turned the main gun on one of the aforementioned Motherships. One shot was all it took to destroy the ship entirely. If you need more information, let me know.