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Coal power triple piston steam engine driving steam boat at queenstown, new zealand.. I originally purchased this in 2004 and restored it back to running condition, which included, at the time, a new-used gearcase, new-used flywheel, new spark plugs, wiring, adding a gas tank, hydro dynamics transom support plate, new speedo pickup, etc. stored and garaged since 2007.. A hydrofoil is a lifting surface, or foil, that operates in water. they are similar in appearance and purpose to aerofoils used by aeroplanes. boats that use hydrofoil technology are also simply termed hydrofoils..