To calculate the exact empty mass of a ship the the used beam weapons and torpedo launchers are added to the hull mass of a ship design.
Note that neither engines nor fighter bays have their own mass, since they are integrated in the hull mass during the construction process.
|Beam Weapons||Mass||Torpedo launchers||Mass|
|Laser||1 kt||Mark 1 Photon||2 kt|
|X-Ray Laser||1 kt||Proton Torpedo||2 kt|
|Plasma Bolt||2 kt||Mark 2 Photon||2 kt|
|Blaster||4 kt||Gamma Bomb||4 kt|
|Positron Beam||3 kt||Mark 3 Photon||2 kt|
|Disruptor||4 kt||Mark 4 Photon||2 kt|
|Heavy Blaster||7 kt||Mark 5 Photon||3 kt|
|Phaser||5 kt||Mark 6 Photon||2 kt|
|Heavy Disruptor||7 kt||Mark 7 Photon||3 kt|
|Heavy Phaser||6 kt||Mark 8 Photon||3 kt|
The table shows the mass for one beam weapon, respectively one torpedo launcher.
Should a ship design for example have 4 beam weapons installed, the beam mass must be taken x4.
Thanks for posting this thin, I often forget where to find this wonderful information. So valuable when calculating how desperate your enemy may be.