Editing Torpedo (section)

===Wire driven===
[[File:TorpedoMotor.JPG|right|thumb|U.S. World War II [[PT boat]] torpedo<!--Mk 8? Or Mk13?--> on display]]
The [[Brennan torpedo]] had two wires wound around internal drums joined to the propellers. Shore-based steam [[winch]]es pulled the wires, which spun the internal drums and drove the propellers. An operator controlled the relative speeds of the winches, providing guidance. Such systems were used for [[Coastal defense and fortification|coastal defense]] of the British homeland and colonies from 1887 to 1903 and were purchased by, and under the control of, the Army as opposed to the Navy. Speed was about {{convert|25|kn|km/h|0}} for over {{Convert|2400|m}}.