Alternate submarine designs: Cargo sub, Tanker, etc.

[scooter]

Simon Lake's submarine freight train, courtesy of Shipbucket.

[ysi_maniac]

 

[zenrat]

Reaching the limits of submarine.

Submarine Battleship. in a certain way it could be like a 'BIG' Surcouf https://en.wikipedia.org/wiki/French_submarine_Surcouf

Submarine Aircraft Carrier.

I love these.  I had a thing for really really big subs when I was a kid.  Used to love drawing them along with massive underwater cities.

[NARSES2]

I like the Submarine Battleship in particular 

[jcf]

Interwar USN cruiser sub concepts:

[jcf]

[PR19_Kit]

Veeeeeery interesting JCF. 

That multiple hull concept predates the Typhoon by a few decades!

[Hobbes]

The first operational multihull subs I know of are the Dutch Dolfijn-class subs built in the 1950s, which had 3 hulls.

[scooter]

Clearly, the Royal Navy didn't share their experiences with the K(alamity)-class steam-powered subs.

[NARSES2]

The Type L in particular interests me. Really does look as if they took a cruiser's upper works and stuck them on a sub's hull.

Great stuff again Jon, thank you 

[Weaver]

Dolfijn-class submarine internals:

[sandiego89]

The first operational multihull subs I know of are the Dutch Dolfijn-class subs built in the 1950s, which had 3 hulls.

Did the Japanese I-400 class have side by side pressure hulls, or just a unique figure 8, but single hull? The hangar tube could also be considered another hull.

[Hobbes]

I didn't think of the I-400. First cross-section I found:

[ysi_maniac]

First approach to Submarine Aircraft Carrier and Battleship. These are based on 2 bottom KGV hulls (remain of waterline cutting) glued together.