The Technocratic Syndicalists wrote:Stirling engines have a fairly poor power density and so are a poor choice for a torpedo, you want a closed rankine-cycle system like HYDROX which combines wakeless operation and depth independent performance with a power density several times higher than that of an open cycle otto fuel II engine. The steam produced by the hydrogen-oxygen combustion doesn't have to be exhausted against backpressure, it can be condensed back into water (the condenser being built into the structural pressure hull of the torpedo) and recycled back into the boiler/combustor. Which is also how SCEPS/ADSCEPS works, although HYDROX has a higher power density because it uses an aluminum/lithium-seawater vortex combustor to produce steam and hydrogen gas (which is then reacted with oxygen produced by a lithium perchlorate fuel cell) rather than using a boiler. 100 knot, 100+ km range meme torpedoes here we come. RIP Bozo to all surface ships.
Well, you could also boil the water for the closed regenerative steam turbine with a boron burner. I mention boron mostly because it would have a high enough energy density and gravimetric energy density to compete with metallic hydrogen as an exotic fuel, about 50%.








