Kokanee is a one-quarter scale model of the Seawolf (SSN-21). She is 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.
The first LSV, Kokanee (LSV-1), is a quarter-scale model of USS Seawolf (SSN-21) and is 90 feet long, 10 feet in diameter, and displaces 155 long tons. Kokanee looks like an SSN on the outside, but inside the forward half of the pressure hull, it contains 1,524 battery cells – about 25 tons worth – to provide power for the electrical propulsion
motor (1,440 cells) and instrumentation (84 cells). The after half of the pressure hull contains the instrumentation, including guidance, navigation and control equipment, and the ODAS signal processors and recording equipment. The after compartment also contains a 3,000 horsepower electric propulsion motor, shaft bearings, and the propeller shaft itself. Kokanee’s external stern configuration is similar to that of any SSN. Because they significantly influence the acoustic signature of the model, the pressure hull and external structures simulate a Seawolf-class submarine very
Components inside the pressure hull have less effect on the acoustic signature, so we have substantial freedom there to deviate from the full-scale Seawolf configuration. (Obviously, we don’t need a control room, crew’s mess, or berthing spaces in an unmanned model.) Kokanee’s stern control surfaces operate similarly to those on an SSN, except that they are operated by computer rather than Sailors. Kokanee was used to evaluate propulsor configurations for the Seawolf class, and was a key contributor to achieving the unprecedented stealth of those ships at high speed. Now,
the model is also being used to evaluate propulsor and other technologies for the USS Virginia (SSN- 774) class.