If you are a regular visitor to SetSail.com, you know we like fine rear ends. Flat buttock lines in particular arouse our instincts. With most yacht designs, there is a conflict here between comfort and performance (and this varies with different speeds, or more correctly speed-length ratios). Typically, you pick a speed regime and sea state and live with the results.
But if you stretch the waterline, keeping other design aspects constant, good things begin to happen.
For one, you get finer sections forward which allow the hull to penetrate rather than pitching up.
Of course this is just a rendering, but we expect this wicked new FPB to have an even softer ride uphill than the FPB 64s, while pitching less than Wind Horse.
What happens forward has to be balanced with what happens aft. Have a full bow and a fat rear has to follow. Fine forward means those coveted sweet buttock lines are possible.
And there is a bonus. Hull shapes like this have a wide envelop of speeds in which to perform efficiently. From speed-length ratios of 1.05 to 1.2 there is little penalty to be paid for getting there quickly. Crank up to 1.25 and the mileage drops, but not precipitously. The FPB 64s and the 83 regularly cross oceans at SLRs between 1.175 nd 1,22. We expect the new FPB to be more efficient yet.
Astute observers will note there is a difference between the stern sections of the FPB 64, 83, and the new FPB. Each is optimized for a different design environment. There is no magic design formula. Each hull is a special case.