Advanced Aerodynamics and Hydrodynamics for Powerboats

Performance Boat design and setup secrets for Recreational tunnels, Offshore Cats, Racing tunnels, Fishing/Utility hulls, Vee and Vee-Pad Hulls, Bass Boats
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Tunnel Boat Design Software   Tunnel Boat/Vee Boat Design Program - UPDATES
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Updates History      Order Update    Order Full TBDP/VBDP

  Nov 15, 2017
Ver 8.7
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  • NEW analysis for STEPS, with more user step design definition, more accurate performance prediction of functional wetted areas, force locations

  • added Estimate/Help features for Step Height, Forward Step

  • NEW dB format [tbdpdat4.mdb], updated TBDP_Convert program for all previous dB's

  • Fixed bug in Acceleration Wizard (input) display

  • Enhanced Report messaging for Step performance including design recommendations, step performance, wetted/non-wetted

  • NEW sort feature for 'Standard Designs'

  • NEW feature compares THREE designs in Performance Graphs

  • Ehanced Reporting for 'Compare designs'

  • Now user can account for tunnel hull 'aerofoil' location offset

  • Enhanced HELP module

Available to current TBDP©/VBDP© USERS. Get the latest Version of TBDP/VBDP. Now more features than ever!

If you already own TBDP©/VBDP© (Ver 8.x or above) and you want to obtain the LATEST SOFTWARE VERSION UPGRADE, you can order on-line. Upgrade includes software only. 

 ORDER Upgrade (only) HERE

Windows 7, 8, 10, XP

  Sept 1, 2017
Ver 8.6.10
  • enhanced Porpoise Regime reporting

  • added Optimum Trim Angle reporting

  • added step angle display on Input screen for multiple step inputs

  • added Estimate/Help buttons for multiple Step inputs

  • expanded step design reporting and recommendations, including optimum Step height reporting

  • fixed printing error (steplength1) in previous versions

  July 1, 2017
Ver 8.6.9
  • added reporting for LwrUnitHeight specified above waterline

  • added input screen notation for 'gallons/litres of fuel' conversion from fuel weight (lbs/Kg)

  • enhanced reporting for identification of 'Maximum Limiting Velocity' and 'Maximum Practical Velocity'

  • fixed 'overflow' error caused if improper user VariableDeadrise inputs

  • added departure analysis for Dynamic Stability, and influence on Max Practical Velocity 

  Apr 1, 2017
Ver 8.6.8
  • Honda lwr unit specs added

  • added reporting of Lifting Strakes performance

  • enhanced Dynamic Stability reporting

  • improved reporting for 'Maximum Limiting Velocity'

  • added JET drive options

  • Fuel volume conversion for Fuel Weight input

  • enhanced Step design recommendations

  • enhanced Hump Transition reporting

  • passenger appendage aero drag added

  • enhanced auto Report wizard info/detail

  • new graphics on input screens

  Dec 1, 2016
Ver 8.6.5
  • NEW standard design option for "Vee hull without Pad"

  • NEW - Upgraded entire TBDP HELP system to MS HTMLHelp-now compatible with Win7/8/10 Help systems; full context-sensitive Help, one-click help buttons on every screen, content Help Search features.

  • Variable deadrise, Notched Vee-Pad/Center-Pod features

  Sept 1, 2016
Ver 8.6.3
  • NEW added "WScreen w/RearCowl" option for cockpit design

  • added engine/motor cowl height, width now automatically calculated

  • UPDATED Motor Wizard; now with over 2250 OEM engine choices; added Selva outboard and Cummins, Catepillar, MTU, Yanmar inboard engine specs

  • revised lower unit drag calculation to include Leg drag if applicable

  • Improved Report Wizard message for Porpoise susceptibility prediction

  • Corrected error when using design Compare feature

  • corrected issue when saving design file

  • corrected fault in display of Sponson Drag % Report Wizard

  Apr 1, 2016
Ver 8.6
  • NEW screen layouts, NEW input variables, more performance analysis, output data/graphics, more reporting

  • NEW 2016 Motor Wizard update, now with over 2250+ OEM engine choices, including new Evinrude G2, new Mercury Racing 400R, new Ilmore V8's, Jetdrive Outboards, Yamaha 350hp V8 Outboard, Evinrude V6 E-Tec's, New Mercury 350hp Sci Verado and Optimax ProXS engines and SevenMarine 557 outboard.

  • NEW input variables and NEW 5-screen input format

  • Animated 3D Chart display for Lift/Drag component contributions through Velocity range 

  • NEW feature allows variable deadrise of sponsons or vee surfaces.

  • NEW feature automatically optimizes trim angles for elapsed TIME and ACCELERATION analysis

  • NEW feature to show extra decimal accuracy (useful for small hull designers and RC users)

  • NEW automated analysis of 'Hump- Zone' transition velocity and 'Force Moment' dynamic stability, explains both in custom Performance Analysis Report.

  • NEW input variables 'Air Temperature', 'Air Humidity' and 'Water Temperature' to allow user to account for environment variations

  • NEW input variable 'Angle Torpedo', for when lower unit has relative trim angle (regardless of WAngle)

  • NEW input variable 'Width Rear Fairing' to allow for unique aft fairing sizing

  • Enhanced analysis adjusts lift/drag and coefficients for changes in air temperature, altitude, humidity, water temperature and water type (fresh/sea)

  • NEW Performance Output data info; 'DCowl Motor' shows drag contribution of outboard engine cowling and 'Force Moment' information for dynamic stability analysis

  • Printed reports to file or printer queue now show user unique file names

  • Reduced Input module loading time and improved screen flash presentation with reduced flicker

  • NEW database format adds more input variables, output info, reduced file maintenance

  • Udated TBDP_Convert routine (Ver 2.1) automatically converts all design file data from all previous dB versions to new TBDP/VBDP V8.6 dB

  • Improved auto screen resizing for all screen types/size/resolutions and printing.

  • Corrected error when selecting "Two Steps" for very small hulls

  • Fixed Win7 UAC error that sometimes caused file save issue.

  • Updated HELP files

Oct 1, 2015
Ver 8.5
  • Enhanced Lift/Drag components display with animation

  • NEW "Estimate" buttons can auto-input estmated input values if user does not have info

  • NEW "WhatChanged" feature on Design Input screens that lists input fields 'changed' during session

  • NEW new input variables for Motor Cowling sizing, Outdrive Weight, CockpitLength

  • Revised aero drag for cockpit and cowling, increased accuracy of aero drag for outboard engine cowling

  • NEW standard design options for 'Bass Boat with center console'

  • NEW cockpit/cowling options "None with RearCowl" and "Center Console"

  • NEW Wizard messages for auto design reports

  • Improved data input validation checks

  • Revised upper limit wetted surface values shown on output screen and Results graphs


June 20, 2015
Ver 8.4


  • Added msg for vee-pad support lift, Corrected Lift Strake message error, Updated Porpoise calc

  • Revised aero drag for Cuddy Cabin option, New Cockpit W/windscreen option

  • Corrected DAero/CDAero algorthim

  • NEW Lower/Drive Unit drag analysis, includes Torpedo drag, skeg drag, leg drag, induced drag and spray drags.

  • Added mini-help buttons for each input frame

  • Added LowerUnit specs for Ilmor Indy stern drive

  • Enhanced Performance Wizard info for XCGDynamic, SprayFac, AeroDrag

  • User requested scaling, units and decimal floating

  • Improved Win7 installation cleanliness



Feb 1, 2015
Ver 8.3

TBDP/VBDP Version 8.3 NOW RELEASED!     (Feb 1, 2015)

"This is the Best TBDP/VBDP release ever!"

  • Enhanced calc for CGDynamic (dynamic stability) for cases of Vee hull with Pad and Tunnel Hull with Center Pod, more accurate for all design configurations and operating conditions.

  • Added 2015 Motor Wizard update, now with over 1750 OEM engine choices, including new Evinrude G2, new Ilmore V8's, Jetdrive Outboards, Yamaha 350hp V8 Outboard, Evinrude V6 E-Tec's, New Mercury 350hp Sci Verado And Optimax ProXS engines.

  • Major rewrite of hydrodynamic lift and drag routines, improving accuracy for all types of operating conditions for all design configurations of tunnel hull, tunnel w/Center Pod, Vee hull and Vee Pad hulls.

  • Added new Whisker Spray analysis, enhanced drag calculations associated with Whisker Spray, also added new performance report variables showing all whisker drag components with individual drag coefficients.

  • Now includes AR analysis of Spray Rails and Lifting Strakes, based on Jim Russell's engineering design paper and published article.

  • Added capability of Below-Chine Spray Rails (deflectors) for Whisker Spray reduction

  • Enhanced application of Above-Chine spray rails and effects on Sheer (friction) Spray Drag

  • Advanced Cockpit/Cowling/Fairing drag now includes complex Cavity Drag analysis.  Multiple cockpit/cowling design configurations to select from, including Open, Covered, Race Canopy, even a Cuddy Cabin

  • Enhanced Performance Wizard Summary Report, with more key data reporting and more design/setup recommendations (specifically written for the performance results presented for your design)

  • Enhanced Quick Design Wizard to automatically input additional typical design dimensions from list of any (11) standard hull designs provided.

  • Added more new Input variables (now 100+ design/setup inputs) for even more enhanced Design and Analysis options

  • Additional Performance Analysis Output measures, now with over 490 output data points, and now including Whisker Spray Drags (for sponsons, Center Pod, Vee, veepad); Lift/Drag Ratios (for sponsons, center pod, Vee and Veepad), separate Wetted Area data (SWet) for sponsons, center pod, Vee and Veepad; separate drag coefficients for CDWSponson, CDWVee, CDWPod, CDWPad, Trim Tabs lift/drag/coefficient/Aspect Ratio; along with all the other performance measures that TBDP/VBDP has presented in previous versions.

  • Added another new built-in standard design option for "Vee Hull Sterndrive" (now 11 typical designs provided); Just select one of the standard designs, use the Quick Design Wizard to modify key parameters to fit your design, and TBDP/VBDP does the rest to set all the design variables for your new design/setup.

  • Added new LowerUnit specs for V8 outboards, RC and IMCO drives

  • Refined decimal floating for smaller hull sizes (such as RC boat designs)

  • Corrected units in some Wizards to reflect Imperial/Metric capability

  • Corrected max values presented for XPorpoise Analysis chart for improved readability.

...PLUS...includes all the other new Version 8.0 features...

  Sept 1, 2014
Ver 8.2
  • Many new graphics/charts added/updated.

  • New Lift & Drag distribution chart, with dynamic velocity range view.

  • Fixed the display of cockpit/cowling drag coef's.

  • Improved algorithms for cockpit/cowling drag calc's.

  • Added new lower unit design selections.

  • Expanded the Report Summary Wizard notes.

  • Added a new file export feature.


May 15, 2014

Ver 8.1

  • Revised aerodynamic drag algorithms

  • enhanced Vee hull lift/drag calc's

  • version update checking

  • enhanced Vee hull aerodynamics setups


March 1 2014

Version 8.0 

NEW Version 8.0 NOW RELEASED!   (Jan 01, 2014)
[see What's New summary]


  • NEW VBDP� - incorporation of the NEW �Vee Boat Design Program� full-featured software for �Vee hull and Vee-Pad hull� performance analysis

  • NEW Auto Convert program to translate older TBDP design data files to the new TBDP/VBDP data format

  • Win7 compatible coding and file management

  • More Input variables (90+), more performance data output information, for more design control and even more performance reporting information

  • NEW �Auto 1-2-3 Performance Analysis" Wizard - automatically steps you through the 3 steps of performance analysis, to calculate Maximum Velocity, (Trim angle analysis) and Power (Acceleration/Elapsed Time analysis)

  • �Porpoise Analysis� - unique AR� �XPorpoise� feature that automatically shows hull's susceptibility to porpoising assessed throughout the full operating velocity range.

  • NEW �Performance Analysis Wizard� (Report Writer)

  • NEW 2013 Motor Wizard with over 1350 OEM engine choices in a selection database, making input of your engine data to TBDP�/VBDP� as simple as picking your motor from a list.

  • Quick Design Wizard - easy to start your design by selecting one of many 'typical' design outlines (with full Input dimensions and setup details) for 'Performance Tunnel hull/Power cat', 'Recreational Tunnel Outboard�, 'Offshore Fishing/Utility', 'Racing tunnel', 'RIB tunnel', 'RC tunnel', 'Vee hull' and �Vee-Pad� designs.

  • Ten NEW Design Wizards - Propeller Wizard; Motor Selection Wizard; Miscellaneous Payload Weight Wizard; Angle Increment Calculator; Quick Design Wizard; WAngle Calc Wizard; Deadrise Wizards; Power Calc Wizard; Velocity Calc Wizard; Expanded Wizard Tutorial and the extraordinary Performance Analysis Wizard (Report writer).

  • �Design-versus-Design Comparison Graphic� screens - compare the performance results of 2 (or many) design features.

  • Advanced Cockpit/Cowling/Fairing drags - NEW analysis for aerodynamic drag; Cockpit/Cowling/Fairing analysis considers profile, friction and even complex cavity drag.  NEW multiple cockpit/cowling design configurations to select from, including Open, Covered, Race Canopy, even a Cuddy Cabin

  • now calculates hydrodynamic drag of ANY lower unit design; includes standard design specs for 31 OEM drives

  • Trim Tabs & Lifting Strakes

  • Propeller sizing

  • NEW On-Line HELP screens (100+ pages); NEW 80+ page User�s manual

  • User Picture Import

  • Auto Bottom Design - for Vee hull design, bottom dimensions are automatically adjusted when a �pad� is added or removed (helpful for easy pad vs. no-pad comparisons). For tunnel hulls, auto adjustment for center-pod changes.

  • �Automatic Static CG� on-screen calculation for any hull configuration

  • "Change in Value" (derivative of the performance measure) feature on graphic performance results screens & reports � makes it even easier to see break points of performance issues, showing �how fast is it changing� data.

  • and a long list of other great new features and enhancements, including: Dozens of other new features and design options include:

    • Improved aerodynamic algorithms; even more accuracy, even more hull configurations

    • Improved drag algorithms for more types of cockpit and cowling configurations
      Symmetrical or asymmetrical sponsons

    • On-screen display of automatically calculated total hull weight and cg

    • Multiple spray rail design selection

    • Aerofoil dimensions view feature

    • Multiple Step selection design frame

    • Minimum wetted sponsons/vee surface length

    • Maximum wetted sponsons/vee surface length

    • Cg on-screen calculation

    • Automatic WAngle increase

    • Automatic Blowover check & alert

    • Automated 'head/tail wind' simulation

    • Centerpod WAngle input

    • Accurate Top Speed prediction

    • Acceleration modeling with elapsed time prediction

    • Angle increment calculator

    • Velocity range calculator

    • Motor height calc's

    • 40+ color graphic performance charts.

    • Euro units version with auto conversion between USA & metric for inputs and performance results

    • Multiple engine/drive applications


Jan 01, 2013

Jun 2012

Jun 2011

Oct 2010

Jun 2010

Jan 2009 

Mar 2008

Feb, 2007

Jan, 2006

Feb, 2005

Jan, 2005

Apr, 2004

Feb, 2004

Jan, 2004

Aug 2003

Version 7.15 (Jan 01, 2013) - general update

Version 7.14 (June 01, 2012) - general update

Version 7.13 (June 01, 2011) - many updates

Version 7.12   (Oct 01, 2010)  - general update

Version 7.11 (June 01, 2010) - many updates; VEE Hull Analysis NOW included

Version 7.92   -general update, many new features.

NEW!!  2008 Motor Wizard database update  - Now over 575 engines listed! (includes 2008 engine update).

Version 7.9  -  2007 Motor Wizard database update includes 450 engine specs; WinXP latest updates.  Vee hull analysis enhancements. 

Version 7.85  - WinXP latest updates; 2006 Motor Wizard database update; Euro software additions, vee-hull analysis features added

Version 7.8 - NEW Motor Wizard Update (2005) includes 350 engine specs; minor analysis upgrades.

Version 7.7 - Auto 'Head/Tail Wind' simulation feature; Improved QuickLift Wizard; Auto WAngle increase function for Velocity Optimization.

Version 7.6 - Design-versus-Design Compare Graphic; AutoBlowOver Check

Version 7.5 - More new features than ever before! Download summary of NEW TBDP features!

Motor Wizard database updated  - Now over 260 engines listed!

August, 2003 - Version 7 release - best features upgrade ever! (Press Release)


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