Advanced Aerodynamics and Hydrodynamics for Powerboats

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TBDP©/VBDP© Hump Transition Analysis
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  BREAKTHROUGH!

Figure 1- TBDP©/VBDP© identifies the 'Hump Transition' Velocity.
  The 'Hump Zone' exists on all performance hulls, and can indicate a point of instability of interest to performance optimization.

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. .

     

Research results now included in performance analysis by TBDP©/VBDP©

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