JB>I believe they retrofitted a diesel-electric to putt along with the Sterling
JB>or go full speed with the original propulsion. I just don't recall if they e
JB>mentioned the transmission, or if they were using the retrofit to generate
JB>electricity. They did mention they were using kerosene and bottled O2 as a
JB>fuel.

 Most posabibly that is it. They still had the Main Diesels  for surface
 propulsion and battery chargi8ng. BUT teh Self contained, Fuel and
 Oxygen, Sterling engine was to increase the underwater endurance.
 ALWAYS a prolbem with the battery submarines. A BIG problem during WWII
 untill the Germans invented the Snorkel Air intake ofr rinning on the
 main engines at periscope depth. We didn't adapt it in any large way
 until the Korean "Police Action"
Teh British experiements with the "Self Contained" Internal combustion
engines using Hydrogen Peroxide for fuel, As the name implies Fuel and
Oxidizer in one package, also to enhance submerged endurance.
The problem that killed the project was the instability of the Hydrogen
Peroxide fuel. With age depending on humidity and temperature
factors it became instable to the point of Spontenious explosions.
Becasue of that the submarine had a system of monitoring the
decomposition rate and was tied up when in post at an isolated spot. The
fuel were outside the strong pressure hull and fairly safely blew Out
from the sub, Sometimes severly damaging anything along side.

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 þ SLMR 2.1a þ This note from El Cajon California USA