(More) sub questions

1) Leaf coil hull: I've seen pictures of this submarine hull form and cursory mentions in books but I have found absolutely no info on it whatsoever.

Does anyone have anything on this? Why it was used over a teardrop hull, advantages and disadvantages thereof?

2) I've been reading up on the layout of US submarines in particular. The Los Angeles has its torpedo room below and slightly forward of the control room, and to my understanding the two tubes on each side are canted outward, leaving room for bow sonar. Where does the Seawolf find room for its extra 4 tubes? Are they spread horizontally and canted further outwards, or layered 2 stacked over 2 each side, or what?

3) Can US submarines like the LA class fire all their tubes at once? I'm not completely sure how the ejection pump ram system thing works, or how many there are.

Frankly the best source I've read on that last point (because I'm nearly devoid of sub literature) is Clancy, who wrote that the Typhoon class had an ejection pump thing each side, therefore 1 for each 3 tubes, and in that same sentence implied the LA class didn't, but I don't know really. AFAIK Typhoons fire their tubes with air, not water and air like the LA, which is a different system. :/

Leaf coil is a Japenglish mistranslation of cigar.

Seawolf tubes are stacked on top of each other and slightly staggered. The torpedo room is huge.

The impulse tanks are usually recharged from the sub's compressed air reserves, and submarines have a lot of compressed air. I'm not sure how the turbine systems on Seawolves works.

Nice, thanks.

Does anyone else have any more info on 1 or 3?

Everything that i've seen on the "leaf coil" hull design suggests that they built it with the sonar system as the primary consideration, unlike other hull designs. The sources don't go into much beyond that.

Example of a coiled leaf. You can see where the confusion comes from, although it's a little bizarre since I think cigar in Japanese is just a Portuguese loan word.

The advantages of a cigar over a pure teardrop are internal volume and simplicity of construction. It's not quite as hydrodynamically efficient, but the teardrop has been ditched pretty much everywhere.

It's also probably easier to fit a conformal array like the Oyashio class has on a cigar.

I was under the impression a true cigar shaped sub was very hydrodynamically efficient and more quiet than a tear shape hull.

Teardrop is more efficient, with smoother flow, and therefore also quieter.
However building teardrop hulls is a pain, fitting equipment inside is a pain, and the whole thing is a waste of money. Performance difference is too small.