If we assume that the canons in ED only fire solid shot AP rounds (i.e. they only do kinetic damage since they don't have a bursting charge), we can use the muzzle velocity and damage per shot values to determine an approximate shell mass:
Weapon | Muzzle Velocity | Damage Per Shot | Estimated Shell Mass | Approximate Caliber |
4B (Fixed) | 900 m/s | 82.1 MJ | 202.7 kg | 240 mm (9.5 inches) |
4B (Gimballed) | 750 m/s | 56.6 MJ | 201.2 kg | 240 mm (9.5 inches) |
3C (Fixed) | 960 m/s | 54.9 MJ | 119.1 kg | 200 mm (7.9 inches) |
3C (Gimballed) | 800 m/s | 37.4 MJ | 116.9 kg | 200 mm (7.9 inches) |
3D (Turret) | 800 m/s | 30.4 MJ | 95.0 kg | 190 mm (7.5 inches) |
2D (Fixed) | 1050 m/s | 36.5 MJ | 66.2 kg | 175 mm (6.9 inches) |
2D (Gimballed) | 875 m/s | 24.5 MJ | 64.0 kg | 175 mm (6.9 inches) |
2E (Turret) | 875 m/s | 19.8 MJ | 51.7 kg | 150 mm (5.9 inches) |
1D (Fixed) | 1200 m/s | 22.5 MJ | 31.3 kg | 130 mm (5.1 inches) |
1E (Gimballed) | 1000 m/s | 16.0 MJ | 32.0 kg | 130 mm (5.1 inches) |
1F (Turret) | 1000 m/s | 12.8 MJ | 25.6 kg | 120 mm (4.7 inches) |
Note that the shell mass estimates are assuming that 100% of the muzzle energy of the cannons is converted to damage. If less than 100% of the energy is converted to damage, the shells will be larger and heavier than I have estimated them to be.
If we look at what WWII-era warships would use as their main battery and compared that to the cannons in ED, we end up with:
- Destroyers using 100-140 mm guns (small cannons)
- Light cruisers using 127-160 mm guns (small and medium cannons)
- Heavy cruisers using 170-210 mm guns (medium and large cannons)
- So called "Super Cruiser" or "Cruiser Killer" designs (which usually never left the drawing board) using 220-310 mm guns (huge cannons)
So yeah, cruiser-caliber cannons. And yet all we hear is a small
thump every time we use them. I get that there is no medium for the sound of the firing and impact of the cannons to travel in, but we have systems installed in our ships to imitate sounds occuring outside our ships as if sapce was not a vacuum (yes it is in the lore, yes there are good lore reasons for it). There is no reason why we couldn't have the cannons sound meatier when fired (like
this or
this) and when they hit (like
this, although a large portion of the sound is a result of the explosive filler here).
Note that all of the links I provided are for 155 mm guns, and that higher caliber guns tend to make a lot more noise when fired and when they hit.