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Aerodynamic and Hydrodynamic Performance
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BREAKTHROUGH!
AR© advanced Dynamic LATERAL STABILITY analysis for Vee hull and Tunnel hull performance optimization.
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Updated: Feb 10, 2026  
BREAKTHROUGH!

Lateral Dynamic Stability by AeroMarine Research
Figure 1 - Traffic Light Assessment - Performance Graphs for Stability analysis features show INDEX results , and visual 'TRAFFIC LIGHT' display for quick ASSESSMENT of stability status.


Lateral Stability in Powerboats
Figure 2 – TRAFFIC LIGHT Indicator shows signal of Stability Assessment
AND...
Summary Stability ASSESSMENT message by clicking on the Traffic Light indicator
AND...
Even MORE Stability details in the
"Performance Analysis Report Wizard

Porpoise Report message by AeroMarine Research
Figure 3 – Summary ASSESSMENT message is included with the full Performance Results Wizard AND also quickly accessible on the Performance Graphs display.  An explanation of Stability status through the full velocity range is provided.


Progressive Results presentation techniques makes the display of complex analysis EASY to view and EASY to interpret!

Making it Easy:
Some Stability analysis is complex but TBDP©/VBDP© presents a full range of reporting information that makes the results, assessments and recommendations easy to understand.

For each of the Stability measures, the software does ALL the work behind the scenes, and gives both DETAILS and also gives the 'GOOD/NO GOOD' summary of all considerations. 

These unique presentation formats are displayed for:

Longitudinal Dynamic Stability Analysis (LongStab Index)

Lateral Stability Analysis (LatStab Index)

Porpoising Analysis (xPorpoise Index)

In the TBDP©/VBDP© Stability analysis, we examine the absolute values of these indicators, rate-of-change (derivative) of the indicators, local trending and global trending of the indicator - all toward identifying the real-world status of lateral dynamic stability.

Here's How we Do It...
To make a quick and easy evaluation of stability results, TBDP©/VBDP© makes it easy by giving simplified 'ASSESSMENT' message in the Performance Analysis Report AND displaying a 'Traffic Light' signal on the Performance Graph display. Of course, more details are also presented in the Performance Analysis Report, outlining the full analysis information for the Results:

1) Detailed Results REPORT - LONG description Results (with recommendations) or SHORT explanation of results are presented in the 'Performance Results Wizard' Report (you can choose either LONG/SHORT version of reporting).

2) Results ASSSESSMENT - a brief statement of stability status is provided (eg: 'Moderate Instability is indicated')

3) Traffic Light Assessment - Performance Graphs for the Stability analysis features, are shown with INDEX measures through the full velocity range, and a visual 'Traffic Light' indicator is also displayed based on the stability assessment:
Lateral Dynamic Stability by AeroMarine Research



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

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about Jim Russell

"Secrets of Tunnel Boat Design - Second Edition"
book
 "Secrets of Propeller Design" book

"TBDP Version 8" Software "VBDP Version 8" Software "PropWorks2" software

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Special pricing updated February 10, 2026
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