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Guys, who knows the range of the Nova cannon, and the torpedoes on the Imperium spaceships? I just heard that the Nova Cannon, a range of about tens of thousands of kilometers

Might be best to move this to 40k background forum?

Torpedoes have a range limited only by maneuvering fuel and the likelihood of them hitting something solid. It's space.

The Nova Cannon fires a shell to an effective range of 150cm in BFG scale which is 1cm = 1000km. While in theory the shell could keep going further, the effective range appears to be more the limit of the targeting systems.

From the novel Warriors of Ultramar, which is consistent with the BFG scale:

Travelling at close to five thousand kilometres per second, the shell closed the gap between the foes in a little under twenty-five seconds.

p. 152, Warriors of Ultramar

25 seconds at 5000km/s means the targets were at 125,000 km range or 125cm in BFG tabletop scale, well within the range of a Nova Cannon.

According to the FFG 40k roleplay game, Rogue Trader, the Mars pattern Nova Cannon has a range of 40 Void Units. And each Void unit is approx 10,000km. So approx 400,000km. As a comparison our moon is, on average, 384,400km from Holy Terra.

The problem with FFG's Rogue Trader is it suffers from massive inflation in ship sizes, crew sizes, ranges, and just about everything else, compared to the original BFG and BL sources. It got to the point where FFG crew sizes conflicted with ship performance in other sources, such as Forge World's Imperial Armour books. For example, Forge World's depiction of the Taros campaign showed the standard Imperial transport transporting roughly an infantry regiment's worth of troops. However FFG's inflated crew sizes would have made the crew of the transport ship much bigger than the cargo capacity of the transport itself (i.e. the 1 regiment size). That goes against the whole idea of a transport ship, which is to transport large numbers of troops with a smaller crew. It makes no sense for a transport ship's crew to be bigger than its passenger capacity.

In a nutshell, FFG just inflated things for the sake of making things bigger. It's no different from some GW pictures depicting Titans as tall as giant mountains.

FFG also has lots of other errors like stupidly short weapon ranges (bolters only being good at pitiful distances when they can shoot at 2km in lore lol) or just stupid statistics that make the FW vehicle armor stats look intelligently designed. Like how imperial ships are armed with weapon batteries having yields in the tetrajoules. That's not terajoules, that's tetra. IE, 4 joules total.

Plus according to FFG MK VII is the bestest armor made and even MK III is gakky compared to modern armor and MK VIII somehow has a better armor rating than MK III.

 Wyzilla wrote:
FFG also has lots of other errors like stupidly short weapon ranges (bolters only being good at pitiful distances when they can shoot at 2km in lore lol) or just stupid statistics that make the FW vehicle armor stats look intelligently designed. Like how imperial ships are armed with weapon batteries having yields in the tetrajoules. That's not terajoules, that's tetra. IE, 4 joules total.

So like a calorie? Dam that must be an impressive weapons battery if it can heat a ml of water 1 degree C.