Advanced Aerodynamics and Hydrodynamics for Powerboats

Performance analysis of any hull design when Full Power operation is considered is very valuable for performance optimization, and particularly for comparison of alternate design/setup consiierations.

TBDP©/VBDP© software's 'Optimize=Angle' analysis will use maximum power to find minimum trim angle (WAngle) to satisfy a solution at each velocity step through the operating range.

Figure 1- TBDP©/VBDP© graphic output shows  performance indicators

When performance OPTIMIZATION is set for "Angle Optimization", your design will be evaluated through a range of specified Velocities. The minimum Angle of Attack (of planing surfaces) based on the specified (Maximum) Power available will be determined for each velocity.  TBDP©/VBDP© Performance Report for “Optimize = Angle” generates the trim angle (WAngle) required for the specified design at MAXIMUM Available Power - so Power will be approximately “maximum available” throughout the velocity range, and the WAngle required to meet this condition (velocity and power) is calculated. All other performance indicator values are resultant of these settings.

Note: this option provides the most comprehensive performance analysis, and the most detailed Performance Report. This setting is most often utilized to accurately evaluate detailed performance of hull and setup.

Figure 2- TBDP©/VBDP© graphic output 'XCFDynamic' (Dynamic Stability)

This option is used at conceptual stages of design analysis and overall hull performance prediction, since it clearly and quickly identifies the operating ranges of many () key performance indicators such as Angle of Attack, Dynamic CofF (stability), Porpoising, Wetted surfaces, Lifts, Drags, etc. This option is extremely powerful when evaluating the performance of your proposed design over the full range of operating velocities. 

'Optimize=Angle' analysis advantages

This performance optimization analysis method is the best method to observe performance at maximum power utilization, particularly when examining performance at top speed range.  The analysis shows all of the performance characteristics throughout the velocity range, while considering the trim angle (WAngle) that will be required with application of full power.

Figure 4- TBDP©/VBDP© graphic output Design 'Compare Feature' shows each performance indicator value comparing 2 or 3 alternative designs.

This method is the best approach to examine different design or setup alternatives, since it easily illustrates the performance differences through even small changes in required trim angle (WAngle) to achieve performance when applying full power.  The Graphic Compare feature makes such comparisons easy to see for 2 or 3 different design alternatives.