The designation of this cycle-engined Torpedo was G 7m.
It is described in much detail in a german book called "The Torpedoes of german submarines" and according to it the tests were pretty successful. The torpedo was test-fired around 200 times with a range up to 12 km and it developed a vmax of 48 knots. Another advantage was that it had practically no bubble trace. It never went into production.
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