Engine Noise
Putting the engines in the rear of the boat also makes the boat much quieter overall where people are likely to be situated at cruise speeds. Volvo conducted an experament on a conventional 450 HP motor with the engines running directly underfoot at the helm at 30 knots, the noise levels recorded were 88 dBA. Volvo then used the same boat, which had not been acoustically engineered for Volvo Penta IPS using the IPS system and the dBA levels at the helm at 30 knots were still only 82 dBA.
In addition to low radiated machinery noise levels, exhaust noise and fumes were also minimized through the Volvo Penta IPS underwater exhaust system. Directing engine exhaust fumes into the propeller wash means the “station wagon effect” is a thing of the past. Cooling water intake is also integral to the Volvo Penta IPS which further reduces the number of holes in the hull and associated appendage drag.
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