Rasmussen Maritime Design

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Working catamaran, displacement hull with Flowbow

4.8 knots Fn = 0.202

5.4 knots Fn = 0.228

6.2 knots Fn = 0.262

6.5 knots Fn = 0.274

6.9 knots Fn = 0.294

7.2 knots Fn = 0.307

7.7 knots Fn = 0.327

8.0 knots Fn = 0.340

8.4 knots Fn = 0.360

8.8 knots Fn = 0.373

9.2 knots Fn = 0.392

 Resistance vs. velocity​

Reduction in resistance for a 15meter displacement catamaran vessel with Flowbow®

At 8.0 knots, resistancereduction approx. 37%​
At 9.0 knots, resistancereduction approx. 40%​
At 10.0 knots, resistancereduction approx. 43%

Reduction in fuel/energy consumption per distance versus velocity.

The graphs show considerable reduction in fuel/energy consumption per distance, compared to traditional hull design, as velocity increases.
This also allow vessels to be operated at considerable higher cruising speed with good fuel economy.

Model test results, resistance vs. velocity for displacement catamaran. Standard hull vs. standard hull with Flowbow®.​

Data from model testing is to be up scaled from model to full-scale vessel, resulting in a greater percentage reduction of the resistance than shown in model testing.