CSS EASTPORT

rebelatsea

Captain
Joined
Mar 30, 2013
Location
Kent ,England.
Following the revelation by Bil R in a previous thread that the plan of this vessel often labelled USS /CSS Eastport, is in fact the rebuild by Phelps and not the original conversion by Isaac Newton Brown, I have produced a preliminary plan of his conversion:
CSS EASTPORT.jpg
 
Let's see... off the top of my head, the differences I can spot are the treatment of the sidewheels and guards, the vertical sides, and the single gunports fore and aft.
 
Following the revelation by Bil R in a previous thread that the plan of this vessel often labelled USS /CSS Eastport, is in fact the rebuild by Phelps and not the original conversion by Isaac Newton Brown, I have produced a preliminary plan of his conversion:
View attachment 41952
Rebel, do you or Bill know whether the original Brown version was to have ironing over a wood bulkhead or a composite iron, wood, compressed cotton, wood system like Arkansas or the River Defense rams?
 
George, until Bil mentioned it I didn't know that the version we are all familiar wasn't Browns. I suspect the protection was a copy of the Arkansas system, but maybe Bil can confirm.
Let's see... off the top of my head, the differences I can spot are the treatment of the sidewheels and guards, the vertical sides, and the single gunports fore and aft.
Brown left 4ft each side of the original hull width. The casemate would have been 24ft wide outsdide, approximately 21ft across inside, and I reckon the four guns would have been pivoted.
 
How much work had the Confederates done on her before she was captured? As I understand it, a lot of the iron and other material had been assembled on shore and was taken along with the ship. Do we know how her ultimate configuration compared with the Confederate design?
 
Eastport as converted by the Union bore a number of similarities to the Benton and Lafayette conversions, at least from a visual standpoint.

Expired Image Removed

Expired Image Removed

This is probably not a coincidence. Phelps had commanded Benton as flag captain under Andrew Hull Foote and would have been familiar with her; and Lafayette was similarly converted from a large civilian sidewheeler at roughly the same time and in the same place (Mound City) as the Union version of Eastport.
 
How much work had the Confederates done on her before she was captured? As I understand it, a lot of the iron and other material had been assembled on shore and was taken along with the ship. Do we know how her ultimate configuration compared with the Confederate design?
Not much ,I think. Phelps built her to a completely new design of his own, and she was probably very much overweight when completed. His casemate as shown in the photos was a new addition "plonked" on top of the hull and much wider.
CSS Eastport would have been 223ft x 32ft x 6ft 6", 663 tons with 4 guns. Her protection we discussed earlier.
USS Eastport was 238ft x 51ft x 6ft 6" ( probably much more by the photos), 1,214 tons, with 10guns, protection was 2" iron on the casemate.
 
Hmm... Just one objection: I think you're including the wheel guards rather than just the beam on the USS Eastport stats, and omitting them from the CSS Eastport stats. The beam of the hull would have been pretty much determined by the vessel being converted; adding length to a riverboat was relatively easy-- chop it in half and splice in the extra length-- but adding width was more complex, adding sponsons, shifting the wheels and machinery, etc. I don't think Phelps & co. went to that length.
 
Mark ,yes I did, sorry I normally specify beam (B), extreme width (EX), in this case the new casemate was 51ft wide, she was wider still over the wheelhouses which had outward sloping protection. He didn't move the machinery at all.
This was all balanced on the original 228ft (OA) x 32ft (B) hull. The plan is by Robert Holcombe.
CSS EASTPORT.JPG
 
One interesting difference between Lafayette and Eastport is that, given Holcombe's plans, Eastport's casemate extended to the guards, whereas Lafayette's was limited to the hull, without guards.

While I won't go against Holcombe lightly, I wonder about the breadth of the casemate, though. To my eye, it looks a bit too beamy in relation to surviving photos.

I can't find a good/clear example online at the moment, but this is the image I have in mind:

098622502.jpg
 
BTW, Donald L. Canney's The Old Steam Navy Vol. 2: The Ironclads, 1842-1885 gives Eastport's beam without guards as 43' (p. 104) but the statement is not endnoted (though Way's Packet Directory appears to agree; this may have been the source). It does sort well with the similarly-sized Lafayette's hull-beam of 44'.


ETA: I'm fiddling with some drawings... I'm having difficulty buying the dimensions of 228' x 32', as opposed to 280' x 43'. That could make a significant difference as to whether the casemate actually extended out to the guards, or only as far as the width of the hull.
 
Last edited:
Hello Everyone,

First, John it's a beautiful job. You've captured the grace of a Dowerman built hull (stright stem, gentle sheer) very well. To provide more room for the third gun I would consider moving the casemate forward a bit. I apologize for not providing further details earlier. Right now I am in the midst of travels and don't have access to my notes. I've got to be back at work by Monday.

Anyway, agreed the hull dimensions as built seem to differ. The only antebellum consistencies are the Bureau of Navigation's Ship Register & Enrollments which give 228' x 32' x 6'6" (as built and after 1860 refit). Certainly, I respect Way, Holcombe and others but I have to go with the official measurements of the era. I honestly think the oft-quoted post-conversion length of 280' is a misprint from someone who mistook 260' for 280'. The reason? A hull of 280' was significantly longer than the 'as built' at 228'. Added at the bow this would have placed the wheels disproportionally aft. While not unheard of it seems unlikely. Especially if you carefully examine the photograph above. Look at the man with the eyeglass on the wheelhouse. I gave him a height of 6' and then measured the hull length. Although not exact it comes much closer to 260' than 280'.

Now this brings us to the beam. When the Eastport was finally recommissioned months later an extensive writeup appeared in the Cincinnati and Chicago papers. It was that correspondent who described her originally as being fitted with double bulwarks about 4' inboard along a plan much like the General Price and other Confederate gunboats. Then he states 'this plan was abandoned and a wholly new plan was put in place by Phelps. This would suggest that her protective scheme would have been similar to the RDF gunboats of double bulwarks, compressed cotton between and iron sheathing on the exterior.

As we know the Eastport was built in 1852 and usually after 5 years of service most boat owners began to look for a replacement hull or steamboat. But the Eastport has been described as being in excellent condition when captured. How can a well-used, decade old steamboat remain in such shape? Aside from being well-used she was also well-managed and maintained. In the 'Vessel Papers' the Eastport file is rather extensive. Postwar, there was a claim from one of her prewar, Northern owners for compensation. There were numerous depositions given (again with variable dimensions) that describe the career of this boat. She was built as a cotton packet boat with the hurricane deck located higher than normal. In the late summer, early fall of 1860 she was taken to Paducah and extensively refitted and rebuilt at considerable expense. This included placing new buckets, wheel shaft supports and other structural elements as well as lengthening the hurricane deck, and expanding the deckhouse. She was described as being 'like new' months before the war broke out.

When captured her appearance was described as follows: guards removed, all upper works and decks removed, wheel houses removed, shafts in place, but wheels disassembled, opening cut into deck to lower boilers into hold, chimnies on the bank, casemate framework up with a portion angled, additional wooden sheathing placed on outer hull (not removed by Phelps), much lumber and iron plating (from Nashville) on shore. Phelps first reported it would take him 2 months to finish his conversion. This dragged on through April, May and June. The reason is he added some 30'+ to the bow and had to widen the hull and redesign the casemate to fit. If I recall correctly one witness mentioned that a second outer hull (sponsons) was fitted to compensate for the expected weight gain. When she did emerge in September there was tendency for the heavy bow (ram fitted) to droop causing the forward floor to nearly buckle. This resulted in more yard time and a further refit. As converted Phelps had his powerful ironclad, but she was structurally suspect. I hope this helps clarify her background.

All the best,
Bil
 
Than you for that Bil, I think that answers Marks question re the converted length and beam.
I spotted the disparity in lengths from the quoted 223ft PP, and estimated her hull length overall would be 228ft, my plan as I put it on hare is actually too long, and I have shortened it at the bow.

From the sounds of it Phelps might just as well have built a new ship !

I suspect she may have been rather "tender" as completed, carrying such a large casemate on a narrow hull. You would have to be very careful with large helm movements. it's interesting that in that photo the casemate edge is actually touching water, suggesting that either the hull was sagging or that her draught has increased, probably both.

I believe Bob and many others relied on William Geoghehan's drawings a great deal, but don't know the origin of the Eastport plan.
 
Not much ,I think. Phelps built her to a completely new design of his own, and she was probably very much overweight when completed. His casemate as shown in the photos was a new addition "plonked" on top of the hull and much wider.
CSS Eastport would have been 223ft x 32ft x 6ft 6", 663 tons with 4 guns. Her protection we discussed earlier.
USS Eastport was 238ft x 51ft x 6ft 6" ( probably much more by the photos), 1,214 tons, with 10guns, protection was 2" iron on the casemate.
In a sense the original version was a side-wheel Richmond wannabe. There is some reason to believe that the original configuration of the Arkansas was to be a 4-gun layout. The real advantage of the vertical type casemates was that they could accomodate a mixture of guns of varying tube length.
 
In a sense the original version was a side-wheel Richmond wannabe. There is some reason to believe that the original configuration of the Arkansas was to be a 4-gun layout. The real advantage of the vertical type casemates was that they could accomodate a mixture of guns of varying tube length.
Here is the original concept design for the Tennessee class: 6 guns ,3 on each broadside in an open box battery amidships.
THE ARKANSAS CLASS AS DESIGNED (2).jpg
 
Hello,
"Rebelatsea" your drafts are as great as ever. I can tell you, I have always been a visual person and these always reach that spot were understanding and imagination meet...(in other words that big light bulb turns on and you say "that makes sence". Also, when you feel your book is ready I hope you make enough copies as I also would like to aquire one, and as yet know little about the rest of the group I know I will probally be stampeded by the rest of the pack in a mad attempt to get one.
Anyway..in a slight turn towards Nashville.. Do you then feel that the other conversions that were taking place at that location were similar to this type of design style (less cannon?), did they ever get the 4 steamboats required, and how many were being converted at that time (as you read of one being stilled used as a transport.

Vikingbear
 
Hi Viking Bear, I've just written a short paper on this very thing for someone . I'll put it up as a new thread in the naval war forum , if it will copy.
 

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