Iracundus wrote: Haighus wrote:
 Haighus wrote:We also have 
HH book mentions of the "newer" ship designs too, like Lunar class ships. It is possible the armoured prows were always around but the combat paradigm was less popular. It is also possible they were not so heavily armoured in the past but retained the same profile, like the Emperor class. The Armageddon class battleship at least dates back to the Scouring, so that gives the armoured prow a long history.
 
 
IIRC, each Segmentum has its own pattern of ships produced in the Segmentum Fortress, plus some other patterns from major forgeworlds, so it is easy to introduce new patterns. The classic Imperial armoured prow is either Jovian or Martian 
IIRC, the "Chaos" design is from Cypra Mundi, and there are designs for (I think) Bakka and Voss pattern ships and prows in the old model range. I may be mixing up Bakka and Kar Duniash for the Rogue Trader cruiser model.
 
 The "newer" Imperial designs now favored by the 
40K Imperium are a concession to loss of technology. The arrowhead designs seen now in the Chaos fleets had more powerful engines and more high powered energy weapons (lances), which over time it seems the Imperium found more and more difficult to produce and maintain. The Martian or Jovian school of design ("armored prow") seems to have become dominant as the simple expedient of slapping on slabs of armor over the front and using torpedo tubes was more doable than maintaining long range lances. 
 
 I think you were referring to the 
Apocalypse class battleship not the 
Armageddon class battlecruiser. The 
Apocalypse is a sign of the Imperium regressing. It has the armored prow, but its long range lances are dialled back to half their potential range due to trouble with the power relays. Actually firing the lances at full range as designed would blow relays and sap energy from the engines, a flaw that the older battleships like the 
Desolator did not have.  
 
 I did mean the Apocalypse. I still think it is highly likely early Apocalypse class vessels did not suffer the relay issues, or they wouldn't have been very effective in their role as Desolator-hunters.
 
 I agree the Imperium in 
40k has lost much, but the point I was making is that the Imperium in 30k still used the "newer", simpler designs to some extent and in a form similar to their 
40k counterparts. Clearly there was a variety of tactics and fleet types in use. For example, the grand cruisers are generally ancient vessels, yet most of them are slow brawlers rather than quick snipers like the Chaos vessels, which fits much more with the Mars/Jovian school. In addition, Mars and Jupiter are some of the earliest shipyards available to the Great Crusade, so it stands to reason many vessels were produced in that style.