Detachable jet propulsion unit for water craft and method of cyclic propulsion

A method of propelling a water craft having a plurality of propulsion units mounted one behind the other on the exterior hull of said water craft between the bow and stern thereof, each of said propulsion units comprising:

• (a) a base, a first side of which is shaped to conform closely to the exterior of the hull of the water craft, said base containing a plenum for water maintained at high pressure;
• (b) first means for introducing water at a high pressure into the plenum in said base;
• (c) a plurality of jet nozzles carried by said base on a second side thereof opposite from the first side, said nozzles being in fluid communication with the plenum in said base;
• and
• (d) second means for detachably mounting said base on the exterior hull of the water craft,
• said method comprising the step of cyclically introducing water at high pressure into said propulsion units sequentially from the bow to the stern of the water craft, whereby a rippling effect of the water expelled through said jet nozzles is achieved.