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I'm not sure where to go with this. Single hull, yes. Forty foot diameter pressure hull yes. Torpedo tubes at 650mm diameter, no. Total armanent of forty-eight stowed torpedoes and missiles, fine plus whatever is carried in the tubes. Angled tubes, yes. Shortest possible hull okay. Seperate VLS, droping that.
I wonder what advantage an increase in tube diameter would bring, if any. I was thinking of 800mm tubes able to handle twelve meter long weapons as well as fire standardized 533mm and 650mm and up weapons. Most Russian weapons are 533mm but the underwater 'cruise missile' that weighs five metric tons, no way at 533mm.
I haven't really settled on characteristics yet. However the battery is no longer the main source of submerged power. It is for operating quietly at economical patrol speeds. The diesels running on lox plus inert gas as buffer is the main propulsion but exhust gases raise the question of disposal. When scrkelling the lox tanks are recharged by liqiuifying with an onboard plant the atmospheric oxygen and seperating out other gases.
Would this boat be cheaper than a nuke? Probably but it would still be expensive due to size and systems.
The 800mm tubes are fed two tubes to a level from a three-six-three abreast weapons on the second and third platform decks and the sub has four platform decks and the hold as pointed out.
USN gave Seawolf the 750mm tubes for advantages of using larger weapons with more space for sonar and perhaps torpedo fuel and explosive charge. Here, the idea is Russia developing a 800 mm tubes for torpedoes of great range, speed and explosive weight. They are single purpose ship killers.
An electric torpedo is assumed but it doesn't have the range or shipkilling power, instead it is a dual purpose weapon in the Mk 48 class and at 6 meters in length can be nearly the length of NATO tubes but have two weapons in each rack. This throws the capacity estimate awry but half length Mk 48s have been tested with the same idea.
I wanted an UUV capability that didnt' require sacrificing torpedo tubes for launch/recovery. I want to go with a Manta type UUV that attaches like a remora to a shark to the outside of the pressure hull and each carry four 533mm tubes for four weapons plus sonars and reasonable endurance on rechargable lithium ion batteries.
The weapons fit would be full length/half length dual purpose electric torpedoes
Large, long range ship killers.
ASW missile scaled up for greater range, better dual purpose capability and greater range and speeds of 533mm payload torpedo.
Supercavitating rocket torpedoes at over 200 knots
Four UUVs carried outside the hull and docked to it externally with four 8.5 meter 533mm tubes.
Alpha type cruise missiles that cruise subsonically but have Mach 2.9 terminal stages scaled up for larger tubes.
Yakhont cruise missiles fire from torpedo tubes with scaled up to 800mm by 12 meter size.
Capability against ships/subs/land targets.
Speed of twenty knots or better on closed cycle diesels with a penalty of higher noise from diesels.
Batteries for six knots patrol speeds and silent running.
Small crew dependant on automation, no more than 50 men/women.
Less expensive than a Seawolf.
Practical? I don't know. Buildable, IMHO yes. Less expensive than similar vessel with nuke plant, maybye.
More producible than nuke, maybye.