Originally Posted by Johnrb
Note also that very narrow hulls can exceed the hull speed defined by the formula 1.34 X sq. root of LWL. High performance multihulls are a good example of this.
Destroyers are another example. The WW II HMCS Haida had a maximum speed of 36.5 knots - LOA is 377 feet (estimate LWL as say 20 ft. less) and you get a ratio of 1.93.
With two steam turbines generating 44,000 hp I certainly hope the Haida can exceed the 1.34 multiplier. I don't think that is not the kind of boat this discussion is about.
As for high performance multi-hulls, they most certainly do plane.