This modification was incorporated in the first commercial units manufactured in 1956. The second -eliminating the bevel gear, brought increased mechanical efficiency. The first - expelling the water jet above, rather than below the waterline, significantly increased efficiency of the unit, and therefore thrust and speed. Progress: Further research and development of the Hamilton's initial design brought three fundament modifications which made the Hamilton Jet what it is today. The 10 - 60m range is defined at the lower end by the large number of manufacturers of light-duty water jets for recreational applications, and at the upper end by a few manufacturers as represented by the Rolls Royce-owned Swedish company KaMeWa.
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