Collision damage

[Comte de Brueys]

The reason for this rule is: LEARN TO NAVIGATE - AVOID COLLISSIONS

If you playing on the same side you can communicate and plan a strategy to beat the enemy (historical: flag signals / orders before a battle, etc.).

You can't do this with enemy ships, so it makes sence to punish ships of the same side for misplaning.

..., so we decided that all colliding ships take damage.

So the biggest ship hasn't only the advantage of more firepower?

You'll see that this housrule isn't that fair when ships of different classes fight each other.