Post your designs here!

Strange.  I tried replicating your design but it keeps throwing an "Internal pressure will rupture barrel" error unless I dial back the muzzle velocity to 2-3km/s.

Oh, by the way, I tested out that offensively massive flak idea.  I couldn't dial in the spread to really delete whole fleets, but it does do pretty significant damage to individual ships.

And bigger. It depends how you want to mount it. A hafnia capacitor is more ideal for nose weapons (width is limited to the barrel's unless you want more flat armour area than necessary) and those mounted straight 'on top' of modules (increased hull armour mass to encompass weapon bulges may negate BOPP cost saving). For weapons inside inlets formed by spacers and narrow modules you probably will have the space for a AlON, BOPP, or water capacitor.

Holy! That's an expensive pencil. For the price of two pencils I could buy a micromissile. What is the body of the pencil made from?

Edit: Also, the dead target appears to have severe acne. It should get that checked out.

It was some platinum alloy, I don't remember which one. Probably not far from the price of platinum either way. I just wanted it to have a good amount of mass, and besides, who doesn't want a pencil made out of solid platinum?

I made a dumbfire rocket launcher out of a conventional gun with a 2 km/s muzzle velocity and a 17.5 kg rocket with a dv of 3.51 km/s. In the end you get a 9 kg, 5.5 km/s projectile, giving a fairly good projectile velocity, combined with a very nice 140 MJ projectile energy, while retaining the negligent energy draw of a conventional gun.

The result is pretty much a middle ground between a railgun and a conventional gun, having some benefits from both categories. This 20-ton gun puts out 420 MW of projectiles downstream while only using 1.2 MW of electricity, thanks to the chemical energy storage in the fuel and gun propellant, which is far better than any railgun even close to its weight can do, and with no need for heavy generators and radiators.

Designs:



Combat test:

Acceleration and dv are not taken into account, but accuracy is fine as long as tangential velocity relative to the target stays small enough. It's not really usable in general cases, but as a short-range weapon against big capitals it works well enough, since you can get an exact intercept on the launching ship. I've been able to take down gunships with no issues, since the first few hits will generally disable the ship, or at least the engines.

Math wise, taking the projectile's acceleration into account wouldn't be too hard to do either, but would require a separate targeting routine for powered projectiles, so I guess we won't be getting that anytime soon.

I'm also not sure how much you'd have to increase the gun size to fit a rocket with 10 km/s dv. It should also be noted that you want the rocket to accelerate to its top speed within a few seconds. Otherwise you'll have to fire from hundreds of kilometers away, and that would make the rockets very inaccurate.

I have guided missiles small enough for super-mega-hyper-extreme bolters