OVERVIEW: The T1‑T is a wire-guided variant of the WWII-era German G7e (TI) electric torpedo, retrofitted by Denmark for use in coastal batteries, submarines, and fast attack craft. It retains original electric propulsion and warhead characteristics, while adding manual wire guidance for mid-course control.

DETAILS: “T1” is the post-war Danish designation for the German G7e torpedo, and “T” marks the wire-guided upgrade. During the 1960s, Denmark refitted G7e stocks with an aft-mounted wire spool and manual steering electronics, allowing operators to adjust course via wire during the torpedo's run. The torpedo retained its lead-acid battery-powered electric motor, speeds up to 30–44 kn depending on variant, 533 mm diameter, and ~280 kg warhead. This modification extended service life into the 1970s and was deployed from coastal batteries (e.g., Herdla), submarines, and fast attack craft for defensive roles .

TYPE: Heavyweight, wire-guided, electric torpedo

FUNCTION:
The T1‑T is launched from a 533 mm tube. Once in the water, it travels under electric propulsion and uses manual wire-guided control during its run. After wire control concludes or ends, it proceeds on its last directed course using gyroscopic stabilization toward the target.

NOTE:
IOC: 1960s (wire‑guided retrofit; original G7e since 1936)
Manufacturer: Germany (original G7e by Kriegsmarine; retrofit by Danish authorities)
Operators: Denmark
Platforms: Danish coastal torpedo batteries, submarines, fast attack craft

SOURCE:
Wikipedia “G7e torpedo”: https://en.wikipedia.org/wiki/G7e_torpedo ; Scandinavian retrofit sources: LiquiSearch technical data and NavalHistory.dk; forum reference to “T1T” retrofit.