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To push a 63 mtr yacht with a displacement of 500 tons (very very light weight construction) you need approx 40.000 hp to push her up to a little above 40 knots;
Frank Mulder proved with "Moonraker" that those speeds are not unreal to achieve, however if the yacht gets larger, other and bigger problems are popping up.
Next to that, what is the advantage of a yacht at planing speed: even a destroyer, capable of doing 40 knot+ doesn't plane..... I am a little sceptical but I am involved in the making of fast moving surface vessels.
BTW - the later owners of Moonraker took out the gasturbo..... the high speeds were intolerable........for crew and passengers.....
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