Spaceships Missiles by Weight

In this post I discussed how much damage guns in spaceships should do. Its seen a fair amount of traffic, and I find myself constantly going back to it. The post generally comes to the conclusion that the damage for a given caliber and the ammunition weight is correct, but that the size of the weapon and its amount of ammunition is off, and suggests buying guns and ammunition by weight. While analyzing missiles is much more complex (and something I keep on putting off), we can use the same assumptions spaceships did to buy missiles and their launchers in the same fashion. These are the two principles:

• Missiles weigh twice as much per shot as kinetic weapons do, and do the same damage
  
• Missile launchers weigh the same as a gun firing a projectile half the size

These are rough approximations, but they give consistent results within the spaceships system. I'm using it for my current game, and the numbers seem to work out. I hope you find it useful as well!