Added resistance in waves knowing yacht’s radius of gyration (calculation)

Calculation template

How does it work?

The calculation requires L_WL, T_c, B_WL, ∇_c, C_P, the yacht’s radius of gyration, K_yy, as well as the significant wave height, H_1/3, and the modal period of the sea spectrum, T₀.

The sea state is modeled by either the Bretschneider (open sea) or JONSWAP (limited fetch) spectra, considering the yacht is sailing in deep water. A custom value of the water density (default is 1026 kg/m3) can also be provided.

The results are calculated for all combinations of:

• Froude numbers 0.20, 0.25, 0.30, 0.35, 0.40 and 0.45;
• Angle of wave incidence, μ, 100, 120, 140, 160, and 180 degrees;
• Radii of gyration , K_yy, 0.20, 0.25, 0.30 times L_WL, and the specific radius of gyration provided;
• Wavelength/ship length ratio, λ / L_WL, starting at 0.5, 0.6 till 4.0

See also:

• Added resistance in waves of a yacht (calculation).
• Added resistance in waves: Response Amplitude Operator (calculation).
• What the hydrodynamic resistance is and why it matters.
• Sea state and wave forecasting.
• Surface waves.
• Introducing the hull.

References:

Some of the links shown below are affiliate links and we may earn a commission at no additional cost to you: