Design or modify "Pad" for your Vee hull - find out if this feature would be a performance improvement for your boat!
Excellent for any size of boat - Sport vee, Offshore vees, Ocean racers (OPC) or Recreational vees, including modified Vee style hulls & Vee-Pad hulls, Bass Boats, even RC performance models.
Location: New York 87' Motor Yacht Design Please tell me your opinions.
Location: New York Since I've not mastered programs like auto cad, making a 14ft boat on paintbrush (the program I use) will look extremely fake because a boat that size can only have so much detail. Originally Posted by Deppari Yachts do you have any suggestions for some other programs?
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. And there is still the 'Power' Analysis feature that gives all the performance data points PLUS Acceleration curves and Elapsed Time maps.
And see it all in Comparative Graphic Trend Charts, or detailed data Reports, or Printed Performance Reports. This is my Boss' boat, he owns several car dealerships and asked me to list it for him because he never uses it. Editor's Note: This article was originally published in 2002, however I felt that it is a very informative source for those of you that are interested in the Tunnel Boat Design Program.
With winter fast approaching, boaters? thoughts turn to winterizing and the dull, boat-less months ahead. Fortunately, if you own a tunnel boat, Aeromarine Research has a way to use this downtime very productively. Aeromarine Research?s Tunnel boat Design Software is used by professionals and individual high performance enthusiasts worldwide to improve the performance of their tunnel boats. The Design screens are all easy to navigate, and the helpful diagrams make entering the correct data a breeze, even for a beginner. Of course, looking at rows of numbers isn't always the clearest way to visualize performance. We started with a lightweight 1998 STV Euro, equipped with a factory stock Mercury 2.5 liter EFI powerhead rated at 260 horsepower. The first step was to accurately measure the hull, as per the requirements of the Tunnel Boat Design Program. As you progress through the measurements, the data input requirements become more involved, requiring weights, engine and lower unit locations, lower unit measurements, maximum horsepower output, propeller slip, and much more. It is important to be accurate with your measurements ? which may require the help of others during the process. When all of the measurements are completed and entered into the Tunnel Boat Design Software, the real fun begins. With the data already saved in the software, a simple mouse click on the ?Calc Perform? button provided us with the output of the software?s analysis.
Taking this yet another step further, the Tunnel Boat Design Program assessed the stability of our STV, arriving at the conclusion that our particular rig would experience relative instability throughout the 55-80 mph range (often referred to as the ?hump? zone). The real fun begins when you alter your setup parameters in the program, and watch the results of your changes.
Although the Tunnel Boat Design Software is highly advanced, it does not have steep hardware requirements.
On or off the water, Aeromarine Research?s Tunnel Boat Design software is a performance-predicting program that is more than worth the price.
As a professional race driver, he piloted tunnel boats to Canadian and North American championships.
Key dimensions are automatically changed, with a 1-key click, to reflect the design simulation and nomenclature of a Vee hull or a Vee-Pad hull.
You can't possably think you've designed anything more then mouse motivated brush strokes can you? To design, as a previous poster already covered, you need to display more understanding of the technical aspects of stability etc.
The winning designs are the ones which have managed to discover and apply the right proportions of these ingredients. It is during these months that we take the time to reevaluate our rigs, and think about changes for the next season. Their Tunnel Boat Design Software can turn the winter into the perfect time to optimize or design your tunnel boat configuration, all without leaving your home. The program uses three different methods of optimization to generate predicted performance results: angle of attack optimization, power optimization, and velocity prediction. On this screen, you enter figures for the hull design - tunnel and pad height and width, number of steps and their length, and pod measurements. The Design screens also include a velocity range calculator and an incremental angle calculator, so you?re spared having to do any calculations on your own. This screen is where you find out how your boat (real or imaginary) would perform under the specified conditions.
So Aeromarine Research has included another very useful feature - a total of 34 different graphs. Here you?ll find the estimated acceleration, coefficients of aerodynamic and hydrodynamic lift and drag (and breakdowns for each part of the hull) and predicted stability data. Aeromarine Research developed the proprietary algorithms used to do the detailed performance prediction through years of wind tunnel testing, water channel testing, and racecourse proving. Although some boat owners will already know their boat?s details intimately, the measurement process also became a learning process for me, as it no doubt will for others. As the Tunnel Boat software shows, it?s amazing how small dimensional differences can really affect the performance of the boat.

This is where the computer, predicting results on acceleration, velocity, and stability, analyzes our virtual model of the STV. Well, in the coming months, our heavily modified 2.5 EFI will trade places with the stock unit. The software will run quite easily on a Windows 9.x or Windows 2000-based Pentium-class system with 32 MB of RAM. Currently living in Canada, he has done extensive aerodynamic research at University of Michigan, MI and University of Toronto, Canada and marine research at the NRC water channel laboratory in Ottawa, Canada. He has written power boating articles for many worldwide performance magazines and has covered UIM and APBA powerboat races. Even effects of geographic altitude and the differences of salt and fresh water are included. As you can see it does sleep 12 comfortably and accommodates a view of four in two sets of bunk beds in the aft. Just going by the plan form of the sheer line, you haven't the foggiest idea about 27 meter yachts. You need to train your eye to grasp the right proportions, shapes, technical details and even colors. Many of us think of ways to extract every last ounce of performance from our rigs as we wait for the warmer weather. The Tunnel Boat Design Software promises to help you optimize the performance of your tunnel boat ? off the water.
After you input the data on your boat, the program makes all the necessary calculations to predict actual performance. These are the places where you can experiment with actual hull design, set up, and much more to see which changes will result in better performance. A note to non-North American users: all measurements are Standard, so if your measurements are metric, you?ll have to convert them. You?ll also assign values to boat weight, motor weight, fuel weight, and even driver weight.
Aeromarine includes setup data for a variety of popular drive units, so you might not even have to measure yours. Like the other screens, the Design Detail Data screen includes a diagram so that it is clear what each measurement refers to.
The only thing you need to do is measure accurately, and feed the information to the program. The Performance Analysis screens show the predicted results of all your tweaking and experimentation.
Here you'll find elapsed time, the location of the static and dynamic centers of gravity, motor and cowl drag, the total hydrodynamic and aerodynamic lift and drag, and many other variables.
These graphs are pictorial representations of the information on the Performance Data screen. And as with all the other screens, the context-sensitive help makes this program especially valuable for the amateur boater.
And yes, the founder of AeroMarine Research is a tunnel designer, driver and racer himself. Also, stock power is more consistent in performance, and will yield greater accuracy for our purposes. During this process, the user will become very familiar with the components of a tunnel boat, as well as all facets of its setup.
Most lower unit configurations are covered, and it saves the user the time of those measurements.
The entire process of measuring the boat, cockpit, and setup characteristics should take no more than an hour for the experienced tunnel boat enthusiast.
Astonishingly, the Tunnel Boat Design Program predicted that our setup would achieve a maximum velocity of 115.1 mph!
We?ll get an accurate assessment of the power output of our modified 2.5, and we?ll put the Tunnel Boat Design Software to use once again.
Although it was originally designed for professionals (the sheer attention to detail is astounding), it is accessible and easy to use for even complete novices. His published papers are highly acclaimed, and are specifically related to the aerodynamics and hydrodynamics of high performance catamarans, tunnel boats and vee-hulls.
Russell is the author of the "Secrets of Tunnel Boat Design", "History of Tunnel Boat Design" book, and the "Secrets of Propeller Design." books. The resulting effect on all performance characteristics of even small dimensional or operating changes can be seen quickly.
It might be best if you toyed with rubber dinghies for a while, before venturing out of the bath tub into real life. Observe the way various boats have been done and try to understand why they've been done that way.
Thanks to Aeromarine Research, you no longer have to spend hours with complex calculations and confusing formulas.
The screen also has a useful picture with the different measurements labeled, so if you?re not sure what the ?Pad Deadrise? is, a glance at the picture will show you exactly what to measure.
If you do though, they helpfully include a clearly labeled diagram (which, like the others, can be enlarged for better detail). You can look at data throughout your full velocity range (say, 10 to 100 mph), or you can highlight a specific troublesome velocity range (say 50-60 mph) in small steps to examine what is causing a specific behavior. Very often it is easiest to just pull up a graph and see at a glance how your changes have affected performance. The help screens are comprehensive and clearly written, and provide quite an education on their own.

But no matter how thorough and impressive the program seems, it is only worthwhile if it can help you improve your boat's performance. This process really helps you understand what features make your tunnel boat perform as it does. The software?s online help system and detailed diagrams go a long way for those of us that are not very familiar with tunnel boats. Taking this even further, the TBDP also accurately predicted our acceleration model ? a big plus for drag racers.
It would be safe to assume that this program will be right at home here, and we?ll be incorporating its resources for future tests involving tunnel boats. Pros can dive right in, and amateurs will find that the program can guide users through each step.
Russell has designed, built and raced tunnel boats, and consulted on design of many recreational, racing, commercial offshore and government hull designs. Now, go back in there and wash the back of your hands, not just the fronts and don't forget behind your ears too . So, first we?ll look at how the software works, and then we?ll see how well its results compare to real life performance. Optimizing for each factor will give you a huge amount of critical information on everything from actual hull design to high-speed stability. You can also be spared costly ?trial and error? alterations that can damage your boat or result in more downtime.
There is also a detailed User Manual and on-line context-sensitive help manual that explains each of these design parameters in detail. You also give a starting velocity and angle, and choose which factor you want to optimize - velocity, angle, or power. Performance Analysis consists of two important parts - the actual performance data and data on stability ? a remarkable asset, since safety is always the first concern of any responsible high-performance boater. You can view any of the listed values as a graph versus velocity, giving you a variety of easy to read and informative graphs. The measurements start off with basic hull attributes ? sponson width, deadrise angle, center pod properties, and so on.
The software noted that our rig would accelerate at a constant rate up to about 103 mph, and that from 103 to 115 mph the climb would be much slower. The Tunnel Boat Design Software can tell you the results of your changes ? before you spend any money or make any physical changes to your rig. There is even an option that will validate all the data you input, and alert you if your value falls outside the appropriate range for that variable. How about a price per pound of displacement, assuming you know what it's displacement might be?
Even if you?re one of the lucky few that lives in a climate that permits year-round boating, this software will prove very valuable ? after all, how else can you test such a huge variety of performance enhancing features without breaking the bank? Normally, it would take an enormous amount of time and dedication to acquire this information ? even learning all the background theoretical knowledge would take quite some time. After all, would you rather spend hours experimenting with and testing motor height, for example, or spend just a few minutes entering data so that the software can help you predict the optimum placement? Aeromarine?s Tunnel Boat Design Software is extremely comprehensive - you must also choose the altitude and type of water in which you?ll be running your boat. If you are relatively new to tunnel boats, you may not necessarily realize what certain ranges of numbers mean. As on all the data input screens, a diagram is supplied that shows the proper measurement points to ensure accuracy. This prediction was within 5 mph of our performance with the STV, as we noted that our STV began to ?crawl? to 115 mph at about 108 mph. The Design screens all clearly illustrate the required measurements, and the included Help file is a gold mine of performance boat knowledge. Essentially, this software allows the tunnel boat enthusiast to alter a ?virtual model? of their current hull, or create an entirely new design and see the results of your changes in real time as you alter each of the many hull variables. Aeromarine has taken their years of experience and knowledge and put them all together in this program. You even have the option of using a constant, straight line, or custom acceleration model for the final calculations. So Aeromarine also includes special notes that both alert you to dangerous results and give advice on how to correct the problem.
I found it most helpful to print the illustration, and have it handy while making my measurements. Each design measurement and aspect of performance is clearly and accurately defined, along with the related background theory. The power of the PC can now be leveraged to offer insights into your hull configuration never before possible with such ease and accuracy.
The Tunnel Boat Design Program is used by pros and individual enthusiasts alike - the program is very straightforward and includes a great deal of support for all types of users.
The beauty of it is that the more you use the Help file, the more you?ll find yourself with an increased understanding of what makes a tunnel boat tick.

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