baithammer wrote: ↑
Most traveller battleships are 200kdt in size with a 8dd - 10dd spinal mount with dreads going up to 500 kdt with 12dd+ spinals.
So a pocket dread would be less than 500kdt with a spinal mount of 12dd+.
There is no rule that limits ships sizes or what spinals they carry. (The 50% rule is not really a limit for jump capable ships). This terminology is your invention, and there is no reason to believe any potential enemies will feel limited by them.
By HG, the Kokirrak and Plankwell, both at 200 kDt, are considered Dreadnoughts by the Imperium.
Battleship: A very large capital ship with thick armour and powerful weapons. Sometimes called ships-of-the-line, battleships are the strength of a fleet and are designed to destroy any enemy they meet.
Note that is says nothing about actual size or narrow limitations on spinals.
baithammer wrote: ↑
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My argument is not that defences are bad, my argument is that screens are not cost effective in the battle line.
Which seems to come from a pov of all or nothing, screens have the added advantage that a ship that survives a round of attack receives there screen back on the next turn effectively augmenting the amount of hull for the round.
Not if the ship is destroyed...
That is why screens work in single ship actions (where we cannot concentrate fire), but not in squadron battles (where we can concentrate fire).
In major battles the system encourages us to concentrate fire to kill opponent ships. That may be simplistic, but that is the system we have.
Let's take another example:
The enemy cheats by using particle spinals. They field a force of small cheap ships with 10DD particle spinals, say 105 kDt, GCr 70, Hull 77000, let's call them "BP".
For one screened BB we get 244 / 70 = 3.5 BPs. Squadron combat might be 10 ScBB vs. 35 BPs.
ScBBs do average 10 × 8 × 3500 ≈ 280 000 damage, killing 280000 / 77000 ≈ 3.6 BP or 10% of the enemy force
BPs do average 35 × 10 × 3500 × 0.55 ≈ 673 750 damage, ignoring the screens, killing 4.6 ScBB or 46% of the enemy force
ScBBs lose badly.
The enemy might even cheat further by building small ships with 1DD particle spinals, say 8 kDt, GCr 5.9, Hull 3520, classified as BLP.
For each ScBB we get 244 / 5.9 = 41.3 BLPs
ScBBs kills average 10 BLPs or 2.4% of the enemy force
BLPs do average 413 × 1 × 3500 × 0.55 ≈ 795 000 damage, ignoring the screens, killing 5.4 ScBB or 54% of the enemy force
ScBBs lose very badly.