 The earlier version, FaT, ran out after launch in a straight line, and then weaved backwards and forwards parallel to that initial course, whilst the more advanced LuT could transit to a different angle after launch, and then enter a more complex weaving pattern.Though Luppis' original design had been rope guided, torpedoes were not wire-guided until the 1960s.During the First World War the U.S. Navy evaluated a radio controlled torpedo launched from a surface ship called the Hammond Torpedo.