|Mark 31 torpedo|
|Place of origin||United States|
|In service||never in service|
|Designer||Underwater Sound Laboratory, Harvard University|
Ordnance Research Laboratory, Pennsylvania State University
|Manufacturer||Naval Torpedo Station Newport|
|Effective range||4000 yards|
|Warhead||Mk 31, HBX|
|Warhead weight||500 pounds|
The Mark 31 torpedo was a destroyer-launched acoustic torpedo developed by the Harvard and $3 universities during World War II. A modification of the Mark 18 electric torpedo, it was conceived as an interim weapon to be used in the Pacific War until a new high-speed acoustic torpedo could be developed for the United States Navy.
- Jolie, E.W. (15 September 1978). "A Brief History of US Navy Torpedo Development: Torpedo Mine Mk31". http://www.hnsa.org/doc/jolie/part2.htm. Retrieved 21 June 2013.
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