After consulting my bookshelf:
Historically the G7es TXI (aka Zaunkonig II) did exist of course. So nothing mysterious about that ;-)
Only the performance data looks more like the experimental Ingolin torpedos with Walter rocket engines. The 750 mm version did (atleast on paper) 9500 meters at 45 knots. Or like the G7u(t), which had versions that did as good as 10000m at 44 knots or 9000 at 50 knots
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