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The ESNA Tern SES CTV is the next generation high performance crew transfer vessel, offering:
THE ESNA TERN SURFACE EFFECT SHIP VESSEL CONCEPT
The Tern hull consists of two slender catamaran hulls. The area between the hulls is closed with flexible reinforced rubber fingers in the bow and an inflated rubber bag in the stern. Centrifugal fans blow air into this enclosed space, providing an air cushion that lifts up to 80% of the vessel weight. The remaining 20% is supported by side hull buoyancy. This allows for the following advantages:
ESNA TERN MOTION DAMPING
The Tern is equipped with a computer controlled active motion damping system which reduces vertical motions both at high and low vessel speeds. As the lift fans supply air to the air cushion, the control system actively controls vent valves that either ventilate the air cushion to a low pressure or closes the valves so that the air cushion pressure is increased.
The vessel can be lifted up and down approximately two meters, thus being able to cancel up to two meters of vessel motion in waves. This is especially effective in long waves/swell, where all other vessel types will float and follow the wave surface. This principle is shown in the figure on the right hand. While both the CTV and SOV will follow the long waves (swell), the control system reduces the vertical motion of the ESNA Tern. At high speed the motion control system smoothens the motions, thus improving the comfort of the passengers and crew.
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MAIN ADVANTAGES WITH THE ESNA TERN SES CTV: