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The routines used to provide you such fast and accurate predictions of
your boat's performance characteristics are based on over a decade of
research, including numerous on-water tests, model testing in an
instrumented towing tank, and a lot of mind-bending engineering.
The code uses the established fundamentals of planing dynamics as it's
core, but takes it a few steps better. We've incorporated the effects of
special hull features, and has made some landmark improvements to
the way high-speed, lightly loaded hulls are modeled mathematically.
Many other secrets we've unearthed along the way about how to
predict the behavior of high speed hulls, drive units and propellers play
pivotal roles in the software coding. Computation of the porpoising stability limits and their effect on the performance is the main trademark of the program.
What good does all this do you? Nothing, unless we can bridge the gap
and predict the exact performance characteristics of your
supercavitating, and sometimes superventilating props. Our code does
exactly that, based on your propeller and outdrive selection, as well as
mounting position in relation to the hull bottom. We calculate propeller
immersion for every speed based on several factors. By knowing the
thrust loading for each prop blade, we calculate exactly how much it
will slip, and how efficient it will be.
The interaction between your engines, propellers, and your boat is a
complex one, which has been especially difficult to unlock. Our code
will show you exactly how short you'll come up using that too-high or
too low pitched propeller, based on the real power output curves of
your engine. We allow you to put in five key points of your last dyno
run, and we fill in the rest. Have fun with the code, as it will even
handle off-design conditions such as single-engine running on a multi
engine hull. If you don't happen to have the latest dyno test for your
motors, don't fear. We have a module which will make a good
approximation of your motors' power and torque curves based on a
few simple inputs.
The results of all of this are highly accurate performance predictions
that are sensitive to even small changes in propellers or setup you
might want to make.
The tradeoff to such a complete code is that it requires a bit of data
input to make it run. We help you out by allowing you to select
defaults if you don't feel like hanging out behind your boat with a tape
measure. We're guessing that if you are the type of person interested
in this, though, you either know all the required measurements, or
would be very interested in investing those few minutes to learn about
how your boat is set up. Our online user-manual will guide you
through the short, painless process.
If you've looked through the input page, you have realized that trim
tabs are not included in the routine. This is not an accident. Our Naval
Architect was actually the first to test and publish performance
parameters on high-performance trim tabs (using K-380S planes), and
devised the method by which their interaction with the hull could be
modeled. What we have found though, is that properly set-up boats
do not need their trim tabs to be deflected much except to get on
plane. Furthermore, to add this module to the program would make it
take hours to execute instead of seconds, with no real benefit to the
user. If you find that you need to deflect your trim tabs an excessive
amount at medium to high speeds to get control of porpoising or attain
the highest speeds, you need to consider shifting some weight forward.
So, try out our free trial version today. It allows you to run up to single
or twin 375 HP Mercury Mag's. The cost for using the full-blown version
is just a penny per BHP, and allows you to simulate any engine,
transmission, drive and propeller setup you can think. Just think about
how much money you lose buying one wrong set of cleaver props... It
pays to get it right the first time!
Come take a ride with us today at SpeedboatPerformance.com
