Advanced Aerodynamics and Hydrodynamics for Powerboats

The 'hump zone' marks the velocity region of inherent 'instability' due to the significant transfer of Lift mechanism. This 'hump' or 'transition zone' occurs on all performance boats, and is different with each hull and setup. When driving the boat you can often experience this change in Lift as the additional lift mechanism becomes more useful.

For tunnel hulls, the 'hump zone' is usually the transition velocity at which aerodynamic (deck/tunnel) Lift forces start generating more significant contributing Lift to the hull performance, and Lift from sponson surfaces become more efficient due to reduced wetted surfaces.

For Vee-Pad hulls, the 'hump zone' is usually the transition velocity when efficient hydrodynamic forces of the Vee-Pad start generating more significant contributing Lift, and Lift from vee surfaces become more efficient due to reduced wetted surfaces.

'Hump Zone' characteristics are helpful when considering dynamic stability of hull, performance of vee-pad feature, centerpod feature, and when designing hull Steps, Lift Strakes.

TBDP©/VBDP© does analysis to determine velocities and characteristics of the'hump zone' and provides narrative description specific to your hull design and setup.

[Note: more information/research paper on Dynamic Stability here]