SEA TRIAL-Donzi/Roscioli
58' , March 6, 2006.
Another very successful sea trial took place March
6, 2006 onboard a Donzi\Roscioli 58'. Hull number was 9
designed with the IEHS Stringer system. This vessel
was also another first with the upper exhaust pipe design.
It is powered with new C-32 Cats. 1,650 hp. The normal raw
water flow rate for this engine system is 160 gpm. Due to
the unique design and ability of the IEHS system to handle
very large amounts of water through the exhaust we added
other 100 gpm using an auxiliary pump, giving a total raw
water flow through the exhaust at 260 gpm. This is the same
as the mtu 1480 hp engines. We realized two great benefits
from pumping the extra water through the IEHS. In
the mtu application we saw a much cooler exhaust temperature,
reaching 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 WOT,
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. It was also was much quieter then our previous
Cat. application. The maximum backpressure reached only
3" on the port engine and 2" on the starboard engine at
40 knots/90% power. At cruise speed, 2150rpm, backpressure
was 1'' port and 0'' starboard.
A note from George VonWidmann about water and it's
relationship to exhaust: With a new generation of engine
systems, a more efficient use of water is quickly becoming
a necessity. The IEHS is able to use 100% of the
cooling water. The additional water makes the exhaust much
quieter as well as cooling it much faster. The cooler the
exhaust is, the more efficient it is. Cooler exhaust flows
at a much faster rate due to reduced pressure. Heat increases
pressure, cool reduces it and in turn makes it safer. An
exhaust that is washed with large volumes of water is also
far cleaner for all aboard the vessel. When exhaust temperatures
are reduced to very low ranges you remove any steam within
the exhaust thereby solving the problem of exhaust being
carried back into the boat.
additional and future sea trials
Donzi/Roscioli 73', Cat C-32 1650 hp more....
Prestige Yachts 120'. Power: mtu 2000 hp
Spencer 60' Sport Fish. Power: Cat C-32 1650 hp
Spencer 76' Sport Fish. Power: mtu 2400 hp
Sonny Briggs 56' Sport Fish. Power: Cat C-32 1650 hp
Motage Yachts 38' Sport Fish. Power: QSC 550hp
Viking 64' 68' 74 Models Sport Fish. Power: mtu 2000 & Cat
C-32 1650 hp, Cat C-18.
Hinckley Yachts T-55 Sport Cruiser. Power: Mann 1300 hp
Hinckley Yachts SC-42 Sport Cruser. Power: Mann 850 hp.
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