Editing Torpedo (section)

==== Increased oxidant ====
The amount of fuel that can be burned by a torpedo engine (i.e. wet engine) is limited by the amount of [[oxygen]] it can carry. Since compressed [[Atmosphere of Earth#Composition|air contains only about 21% oxygen]], engineers in Japan developed the [[Type 93 torpedo|Type 93]] (nicknamed "Long Lance" postwar)<ref name="Morison, Samuel Eliot 1950 p.195" /> for destroyers and cruisers in the 1930s. It used pure compressed oxygen instead of compressed air and had performance unmatched by any contemporary torpedo in service, through the end of World War II. However, oxygen systems posed a danger to ships carrying such torpedoes under normal operation, and more so under attack; Japan lost several cruisers partly due to catastrophic secondary explosions of Type&nbsp;93s.

During World War II, Germany experimented with [[hydrogen peroxide]] for the same purpose.

The British approached the problem of providing additional oxygen for the torpedo engine by the use of oxygen-enriched air rather than pure oxygen: up to 57% instead of the 21% of normal atmospheric compressed air. This significantly increased the range of the torpedo, the {{Convert|24.5|in|adj=on}} Mk 1 having a range of {{convert|15000|yard|m}} at {{convert|35|kn|km/h}} or {{convert|20000|yard|m}} at {{convert|30|kn|km/h}} with a {{convert|750|lb|kg|adj=on}} warhead. There was a general nervousness about the oxygen enrichment equipment, known for reasons of secrecy as "No 1 Air Compressor Room" on board ships, and development shifted to the highly efficient Brotherhood Burner Cycle engine that used un-enriched air.<ref name="ReferenceA"/>