phillies wrote:11 foot freeboard -- moving it places will be entertaining. Perhaps the armour is shipped separately for assembly at the destination continent?
The perhaps most interesting line is that there will not be more of these for quite some time. There are any number of interpretations, including the Houseman works getting turned into lakes by the rakurai projector, the supply of iron ore proving inadequate, the supply of rivers being unsatisfactory, torpedoes, a decision to supply Emerald and Corisande -- Charis and Chisholm from their geography look less satisfactory -- with good rail networks, etc.
USS
Onondaga, draft 12'10", freeboard (exclusive of turrets) 5', displacement 2,500 tons; sailed from US to France (across the Atlantic) for sale to France in 1867.
USS
Monadnock, draft 12', freeboard (exclusive of turrets) 4.5', displacement 1,564 tons; rounded Cape Horn in 1866 . . . in the winter.
There are other examples available. [G] Admittedly, both these ships (especially
Onondaga) displaced considerably more than the Rivr-class in normal load conditions, but they also mounted much thicker armor: 11-12" (albeit over a lower total area) as opposed to the River-class' maximum of 3". In addition, their guns were individually far havier ---
Monadnock mounted 4 15" SBs which
each weighed 15,700 lbs; total weight of gun tubes was 31.4 tons for the monitor versus 74 tons for the River-class, but the individually smaller Charisian guns would be more readily located and/or shifted as needed for stability issues. Moreover, the truth is that displacement qua displacement is not as major a factor in oceanic survivability than many people seem to think.
It is fashionable to assume since
Monitor sank under tow that none of the river/coast defense monitors could survive normal Atlantic conditions, but this is not, in fact, even remotely the case.
Monitor was lost
primarily because she had neither a permanent smoke pipe nor ventillators raised sufficiently above deck level. The later monitors -- even the very small, single-turret types, like Ericsson's
Passaic class --- were far more survivable because they did have permanent smoke pipes, pilot houses relocated to turret tops, and tall deck-level ventillators. Indeed, I think (I'm not certain of this, but I
believe I'm correct in saying this) that
Monitor was the only US ironclad lost to sea state conditions. I think all the others lost to "hazards of navigation" were lost as the result of grounding or other inland waterway damage (like the Red River Campaign).
I'm not saying that these ships are remotely designed to be effective blue-water ironclads, because they aren't, but it's truly amazing how seaworthy small vessels --- especially
powered small vessels --- can be. Don't forget that Columbus crossed the Atlantic in ships which were probably no more than 50' in length and probably no more than 60 tons
burden, not displacement!