A ship's Master and yacht designer for over 30 years, George has been refining this system for the past 15 years. It has in recent years, become the newest standard for exhaust systems throughout the marine industry. This unique underwater exhaust system utilizes an "exhaust thrust slot", incorporating an even more unique "wedge". This exhaust slot and wedge, located at the trailing edge of the tr
ansom, where the maximum hull pressures are generated, literally pull exhaust from the system. As the exhaust meets the exhaust thrust slot, it encounters a powerful vacuum created by the wedge at the leading edge of the slot, pulling the exhaust and greatly reducing backpressure. At the same moment this exhaust is pulled out of the engines it is pulled underwater, along with it the noise, the soot and the steam. At startup and while at idle, the exhaust and raw water exit the hull via a low speed bypass. This bypass pipe is located just above the waterline on the side of the hull at the transom and disperses the exhaust away from the vessel until the vessel is in gear when the vacuum wedge and under water exit slot take over...
The IEHS is installable as a stringer system built into the stringers inside the engine room, running aft or as an aft chamber system. Each IEHS is custom designed and custom installed. To any boat builder, each of his boats is a labor of love. Each one is a work of art. We feel the same way about the IEHS. In 15 years of designing exhaust systems, few if any have been the same from boat to boat. Each is unique and just as much a work of art to us as the vessel it serves. Since the early 20th century, the marine exhaust industry has been plagued by traditional thinking. The IEHS has broken the barriers of convention. No longer must one tolerate high backpressure. The IEHS relieves backpressure to as low as zero. No longer must one tolerate steamy, smoky exhaust. The IEHS removes up to 80% of exhaust particulate. No longer must one tolerate deafeningly loud exhaust. The IEHS quiets exhaust noise down to less than 82dB. The IEHS requires much less space for installation than any traditional pipe system. We have been able to carry bigger fuel tanks, up to an additional 400 gallons in many cases. In addition, for the first time in boat building history, this exhaust system is actually used to improve hull and fuel efficiency by using exhaust "thrust" to create hull lift and at the same time create forward moving energy. Clients are experiencing improved time to plane, up to 20% faster. The IEHS is able to handle larger amounts of raw cooling water. As much as 100 gpm more over conventional round pipe exhausts. This results in an almost complete elimination of steam which means operating temperatures as low as low as 96 degrees Fahrenheit inside the IEHS duct. We guarantee: Your boat will not only meet but exceed any engine companies' backpressure requirements. We guarantee: Significant space savings, up to 60% over conventional round exhaust systems. We guarantee: A quieter cleaner exhaust than you ever thought possible. We guarantee: We will work with the builder, hand-in-hand to meet his individual needs and to develop and implement solutions in as timely a manner as possible. However, these guarantees must go hand-in-hand with the understanding that we rely on the builders' judgment and understanding of his vessels if the builder guarantees he will rely on ours. Click here for information about the design process. The IEHS is proud to call home, some of the most prestigious luxury and sportfishing yachts on earth and we vow to work diligently to uphold a reputation that will one day be looked upon by history as an important element in the evolution of marine exhaust. At VonWidman Designs LLC, we continue to work with our clients to ensure that each and every one of their quality yachts leaves the yard with the best exhaust system possible.
