Normally a larger beam for greater stability would imply extra hull resistance, but the UT 790 benefits from a new 23m form that has lower resistance than traditional 20 and 22m designs and combines a wave piercing bow that pierces through the water rather than riding on top of the waves.
This allows the vessel to run continuously at service speeds regardless of sea-state and eliminates slamming. At speeds of 14 knots and violent storm conditions (waves higher than 9m), tank tests show no water above forecastle deck level. In extreme wave heights, water will be visible at the forecastle long before the situation gets critical, allowing power to be reduced and the maintaining of generous safety margins.
The UT 790 CD re-thinks anchor handler layout, moving the engines further aft and locating the secondary winches low down, where the engine room would traditionally be, to help improve stability and free-up space.
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