The IEHS boasts the marine exhaust industry's lowest
backpressure. In many cases as low as zero. This is very
important for the life of your engines. It means two things.
It means your engine can devote more horsepower pushing
the boat forward and less horsepower pushing its exhaust
out as it does with a conventional exhaust and it means
you are conserving fuel.
You are the designer for BigDaddy Yachts. You are
faced with a common problem. You know that a great selling
feature of any yacht is engine room space, without sacrificing
space elsewhere. You look at other yachts and you see how
much room is required for the exhaust system. Looks like
too much, doesn't it? You realise that if the exhaust system
weren't so big you could carry larger fuel tanks. You could
carry more fishing equipment. You would have a place for
your mother-in-law. You would sell more boats!
The IEHS requires an absolute minimum amount of
space needed for the exhaust system. In fact, the IEHS
frees up to 60% of engineroom space.
On the Roscioli\Donzi
73', we were able to place an additional 400 gals
fuel aboard, and much of the boats' equipment found a home
ontop of the IEHS as it was installed within the
boat's stringers. , freeing up a tremendous amount of space.
The thrust from the exhaust thrust slot has been credited
with reducing time to plane up to 20%. In the image above
you can see the lifting action that occurs from startup.
At sea tests, engineers have been very surprised at the
amount of lift as the engines start. As forward motion and
speed increases, the lift, as well as degree to which the
exhaust is being pulled from the system also increases due
to the interaction between the exhaust, wedge and the water
rushing under it.
When at cruising/planing speed the exhaust is being pulled
from the exhaust thrust slot up to 50% faster than the boats
forward motion. This allows no opportunity for the exhaust
particulate to accumulate behind the boat.
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With the IEHS you can see
something you may have more than likely been missing with
your conventional round pipes. You can see where you've
been. The IEHS removes up to 100% of your
boat's steam due to it's ability to pump much larger volumes
of water over any conventional round pipe system. Up to
260 gpm. In a recent sea trial temperatures reached a maximum
in the upper pipes, @ 2150 rpm of only 124 degrees Fahrenheit,
a chamber temperature of only 126 degrees and a lower duct
temperature of 92 degrees. At wide open throttle: 2360 rpm,
the exhaust temperature at the turbo was 330 degrees. Just
aft of the upper pipes water can, exhaust temperature was
only 134 degrees. At the chamber, 134 degrees and in the
lower duct only 96 degrees. The exhaust was totally free
of steam. Remaining exhaust particulate is being pulled
under water and away from the boat at a rate which is actually
faster than the forward motion of the boat leaving in the
wake nothing but fresh air. Even at wide open throttle you
will see no smoke or steam.
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