Submarine Lengths - info, ship costs

[Kaiser Kirk]

One thing I used to wonder is 'how long are submarines' to fit in my docks.

Quite a while ago I started going through Wiki's submarine listings and making a spreadsheet.
Never finished, but had enough it's probably usable.

Summary is this :

N7 Sub	Tonnage	Length (m)
	250	24		2.3		1.5
	500	48		4.6		3.0
	750	72		6.9		4.5
	1000	97		9.2		6.0
	1500	145		13.8		9.0

Worksheet (as far as I got) is attached.

[Kaiser Kirk]

May as well stick some cost info here.

	From 1903 encyclopedia
name	class	ld date	tons	cost		cost/ton
missouri	BB	1900	12230	2885000		235.9
ohio	BB	1899	12440	2889000		232.2
maine	BB	1899	12300	2885000		234.6
Illonois	BB	1897	11565	2595000		224.4
bainbridge	tbd	1898	420	283000		673.8
bagley	tb	1898	167	161000		964.1
bailey	tb	1897	235	310000		1319.1
Dahlgren	tb	1897	146	194000		1328.8
Denver	PC	1900	3200	1080000		337.5

[Kaiser Kirk]

And another source of costs, also with expected service life.
There's a Royal Navy list on maintenance costs I found in a post while researching carrier costs.
It also has "Type Lifes"
BBs - 26yrs
Cruisers - 23.5yrs
Carriers - 20 years
DD - 22
Sub - 14   - on subs I had long ago come across '12' as their useful life.
Quite simply, on a surface warship, having minor equipment failures, or sprung seams, can be machinery in need of repair or leaks.
For subs, it may mean not returning to the surface...so 'safe' sub life was shorter.
Worse, subs took alot of expensive well trained engineers, and specialty parts, so costs were high. Not to mention torpedoes were actually pricey.
Factors like that are why the French considered a submarine-focused fleet...and decided not to.


Anyhow the interwar data broke down like this....I made this several years ago...back in the age I had spare time....
To me, one aspect of interest was the concept that due to obsolescence and attrition, carrier planes basically had to be replaced every three years.

I've taken the base data and played with it.
The last element is maintenance costs per ton, with and without aircraft.
As one can see the maintenance varies greatly by ship type,
the carrier hulls aren't so bad, but the airgroups are very pricey.

There's also a note equating 27 AC to 1 BB, I think that is the maintenance cost ratio.

There was also a RAF study that concluded that a squadron of bombers (twins at that time) cost as much as a BB over the lifespan of the BB.

Interwar Royal Navy costs
Known
Ship Class	Assumed	Type	Light	Standard	Full Load		Type Life	Annual Maint	Annual A/C main		Ave * Life / STD = Capital cost/ton
Nelson	Nelson	BB-3ac		33300	37780		26	310000	34500		240
"Cruiser Large"	County	CA-2ac		10400	14150		23.5	187000	23000		212
"Cruiser Small"	Artheusa	CL-2ac		5220	6665		23.5	130000	23000		259
CV Large	Courageous	CV -36 AC		22500	26500		20	255000	414000		180
CV Small	Hermes	CVL -15 AC		10850	13700		20	160000	172500		300
DD Flotilla (8)	J	DD		13760			22	332000 (8)			291
DD Individual	J	DD		1720			22	41500			401
Sub 1000t	L Group 3	SS		960			14	39800
									Equals 11,500/AC
Known									Or 27 AC = 1 BB
Ship Class	Assumed	Type	Light	Standard	Full Load		Type Life	Maint/Ton	W/AC
Nelson	Nelson	BB-3ac		33300	37780		26	9.3
"Cruiser Large"	County	CA-2ac		10400	14150		23.5	18.0
"Cruiser Small"	Artheusa	CL-2ac		5220	6665		23.5	24.9
CV Large	Courageous	CV		22500	26500		20	11.3	29.7
CV Small	Hermes	CVL		10850	13700		20	14.7	30.6
DD Individual	J	DD		1720			22	24.1
Sub 1000t	L Group 3	SS		960			14	41.5