According to Norman Polmar, USS Cheyenne
(SSN-773) had a pumpjet for evaluation. However, this may have been misinformation, as this photo would seem to indicate otherwise...http://www.navsource.org/archives/08/0877330.jpg
In fact, the Cheyenne
, as one of the last 688's would have been too late to contribute to Seawolf
as a test bed. One earlier 688 (Memphis
) was used extensively as a testbed for new submarine technologies, systems, and equipment. Testing of Seawolf's pumpjet and other items was accomplished by Kokanee
LSV-1. Kokanee was a one-quarter scale model of the Seawolf
(SSN-21). She was an unmanned, battery-powered, free-running model, 90 feet long, 150 tons, with valve regulated lead acid (VRLA) wet cell batteries weighing approximately 25 tons powering a conventional 3000 Hp DC motor. This large-scale structural model was delivered to Bayview in north Idaho in November 1987 and operated in Lake Pend Oreille for research work.