There is a boiler with 2 tubes attached which is the engine . Water in the boiler is heated and produces steam bubbles which increases in volume rapidly . It in turn pushes energy out of tubes propelling boat forward . This action will continue as long as heat is applied to boiler . To start cycle the boiler and tubes must be filled with water using siring supplied in kit fit one tube until all air is expelled and water comes out of other tube .Ensuring no loss of water by putting finger over both tube put boat into pond or water container . Light candle and place under boiler Motion should commence approx 1 to 2 minutes after heat source applied . Sometimes you have to re prime tubes due to air lock . Thank You .