[2022] torpedo arming distance?

Probably best to provide the Replay?

Homing Torps tend to arm about .5km away, and Dumbfire Torps are around 1km. The ranges can vary a bit, but that's a general rule of thumb.

Are you thinking of CV torps? The question in this thread was regarding Submarine torpedoes.

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If you have a replay showing an issue with Submarine Torp arming times, please let me know.