Torpedos are typically single fire pieces of 3"x 1/4"diameter rod in 1/72nd scale. They don't go to far, usually less than 12 feet.
In 1/144 scale, they are often represented by large ball bearings.
None of the torpedos in "rc combat" are powered.
Pacific warship club in the bay area are working up torpedos lately.
Our sub guys called "no Joy", because the destroyer captains could lob about 6-8 ball bearings straight up into the are, and arc them down range around the submarines. If a referee saw that the bearings dropped within a foot of the submarine, it was called sunk. The "hedge hog" weapon typically sunk
the same submarine three times a battle.
RC warship combat models 1/72nd scale Oregon and Washington