Ive been reading the Spelljammer war captains companion book to make my own spelljammer ships however when i got through making one with plating and Thickening of armor the best i can get with Thick wood is AC 7, Where as a very similar ship to the one i made the whaleship also uses thick wood but has an AC value of 4, am i missing something?
PDF's to the rescue
Depends on sizing as well.
And what race makes the ship.
Human(general) - +1AR or MC or one special
Thick Wood (Heavy) has a Base Cost of 1,000gp and AR of 9.
Ok found the Whaleship entry in The Legend of SJ Box Set.
mmmm your right it's Thick Wood and a MC of E at 80tons.
So your ship:
Thick Wood - AC 9
Human (general) builder - +1 AC (now AC8)
Hull Thickening - +1 AC (now AC7) * uses 20% (min 1 ton) of available cargo space to do so.
Armor Plating - +1 AC but drops MC by 1 class. (now AC6)
Other steps that can be taken according to the War Captain's Companion -
Different materials to use. This can increase the AR of the ship.
And Special Arcane Modifers: "Increase (Subtract) AC Rating to a maximum of AC4 - This is on page 73 of the War Captain's Guide: Book 1.
I believe the Special Arcane Modifers is what accounts for the Whaleship's Armor Rating.