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All Hydro-Lance vessels are simple displacement hulls,  with the same math calculations used for weight displacement of a rowboat, or a full sized cargo ship.   However, because conventional ships require large amounts of freeboard (that distance from the water's surface to the top of the hull) to prevent crashing waves from rolling over the deck (deck-wash),  the tonnage of conventional ship displacement often far exceeds the intended use. For example,  the cruise ship Stattendam is a  55,451 metric ton vessel and will carry 1,266 passengers plus a crew of 704; that's 28 tons of ship for every person!  Conventional vessel design just gets real heavy simply to provide the space demanded for luxury cruise passengers, such as ball rooms, suites, formal dining rooms and swimming pools - all inside a heavily ribbed tub.  Otherwise that ship's displacement, with HARTH technology, would diminish significantly, having the house and interior configured in rectilinear space which can house an amazing amount of passengers and cargo in comfort.  The width and clear-span spaces is the difference  relative to the volume - and the laden weight required to displacement.

Conventional ships have unlimited freeboard (extra tonnage and vertical size to the main deck) to accommodate the predictable hog and sagbow plows and deck wash in elevated sea states. The Hydro-Lance formulates this excess and therefore a lesser tonnage ship may more efficiently and safely accommodate the same mission or application.  Even the house is far above the oceans surface and is mostly rectilinear, though stream lined for aerodynamic air and wind management.  The house is designed and frequently structurally separate (intimately adjoined) to the main structural components allowing for modular construction.  One modest sized 2,000 gross metric ton Hydro-Lance vessel could carry a cargo of perhaps, 1,000 tons (that's a lot of people and baggage), while having a significantly higher interior volume of usable rectilinear space to accommodate passenger comfort,  ball rooms, state rooms, and common spaces.  This is due to the entirely different construction geometry of the Hydro Lance.  With normal speeds of 3-7 times greater than that of conventional vessels, and seven times the fuel economy, many more routes are competed in the same time period that the conventional vessel completes just one trip.  This of course, translates to revenue and economics.

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1 Comments in Response to

Comment by Craig Goodrich
Entered on:

These are claimed to be true displacement hulls. The hull speed (most fuel-efficient speed) of a displacement hull is C times the sq root of the waterline length, for C somewhere between 1.2 and 1.7 depending on the authority, length in feet and speed in knots. This means a hull speed of 30 knots requires a LWL of around 450 feet, 50 kts a quarter of a mile. I believe that website is a complex practical joke.

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