By Bryn Monnery
These values have been worked out using Nathan Okuns formula and my best knowledge of plate thickness for different ships, sloping etc. The net output is it toughness in equivalent inches of wrought iron.
|
|
Turret/Battery |
Sides |
Deck |
|
New
Ironsides |
4.5 |
3.0 |
1.0 |
|
Dunderburg |
5.5 |
2.5 |
2.5 |
|
Monitor |
4.7 |
1.4 |
0.8 |
|
Passiac |
6.3 |
2.0 |
0.8 |
|
Canonicus |
6.2 |
1.7 |
1.1 |
|
Onondaga |
6.3 |
3.6 |
0.8 |
|
Miantonomoh |
6.2 |
3.5 |
0.8 |
|
Milwawkee |
4.7 |
2.0 |
0.4 |
|
Casco |
4.7 |
2.0 |
0.4 |
|
Roanoake |
6.3 |
2.3 |
1.1 |
|
Dictator/Puritan |
10.3 |
3.6 |
1.5 |
New Ironsides was armoured with homogeneous wrought iron, so its values are exactly the same as its thickness. I’ve assumed the same for Dunderburg, but have factored in the 35 degree slope of its casemate.
Most Monitors were built with 1 inch, 1.5 inch or 2 inch thick cast iron strips. From current evidence Monitor and Passiac were built with 1 inch thick strips, while the later Canonicus had 2 inch strips. Dictator and Puritan are different, as they had 5 2 inch thick strips, but a 5 inch thick layer of wrought iron at their centre, resulting in an extremely tough turret.
|
Virginia |
3.9 |
? |
? |
|
Richmond |
3.9 |
? |
? |
|
Fredericksburg |
3.9 |
? |
? |
|
Virginia
II-front |
5.6 |
? |
? |
|
-sides |
5.3 |
|
|
|
Texas |
5.6 |
? |
? |
|
North
Carolina |
3.9 |
? |
? |
|
Raleigh |
3.9 |
? |
? |
|
Albemarle |
3.9 |
1.5 |
0.8 |
|
Neuse-front |
3.9 |
? |
? |
|
-sides |
2.1 |
? |
? |
|
Palmento
State |
3.9 |
? |
? |
|
Chicora |
3.9 |
? |
? |
|
Charleston |
3.9 |
? |
? |
|
Columbia |
5.6 |
? |
? |
|
Georgia |
3.9 |
? |
? |
|
Atlanta |
3.9 |
? |
? |
|
Savannah |
3.9 |
? |
? |
|
Huntsville |
3.9 |
? |
? |
|
Tuscaloosa |
3.9 |
? |
? |
|
Tennessee-front |
5.6 |
? |
1.5 |
|
-sides |
5.3 |
? |
? |
|
Nashville-forward |
3.9 |
? |
? |
|
-aft |
1.5 |
? |
? |
|
Manassas |
0.8 |
? |
? |
|
Louisiana |
3.9 |
? |
? |
|
Mississippi |
2.0 |
? |
? |
|
Missouri |
1.5 |
? |
? |
|
Arkansas |
3.9 |
? |
0.8 |
|
|
|
|
|
|
Foreign
Built |
|
|
|
|
Scorpion |
10 |
4.8 |
? |
|
Danmark |
4 |
3 |
? |
|
Stonewall |
4.6 |
3.7 |
2.8 |
I’m using standard round conventions, so USS Monitor now has a turret armour of 5, and side armour of 1, while Virginia has a casemate of 4, and her sides are also 1. In both these cases we need to simulate the fact that the majority of hits will strike the armoured casemate.
Warrior converts now with a Battery of 5, and the “soft” ends as 3, which also applies to New Ironsides.