Thu Jun 30, 2016 3:53 am
Great question and one to which I will give some insight, but there will be more which I missed.
The Union has at least four tasks for its ships:
1. Close blockade of Southern ports
2. Distant blockade of Southern commerce
3. Protecting Union commerce
4. Supporting land units in river and ocean invasions.
For the blockade, most Union ships help. For close blockade, look at what the region requires in combat ships, type does not matter.
For distant blockade (I am on shaky ground) each Frigate or Sloop helps stop the Rebel import.
In the Union shipping block, you want to chase away CSA raiders. So Frigates and if you build them, armored frigates.
For landings, use your transports which you must guard with combat ships. Most vessels protect transports. Build sufficient Wooden ships, Tin Clad and Ironclad vessels to best what the CSA builds.
If you think of ship by purpose, any non-transport units are fighting ships. Look to their qualities and costs.
Transport ships need other ships to protect them.
An odd Union type is the Mortarboat. This is purpose built to bombard forts. In historical terms, these helped take New Orleans.
The other odd type is Flatboat. These are cheap transport and can be used to build depots.
Quick take.