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Trawling using Ecotrawl 
Autonomous Underwater Drones (AUD)

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– Optimal propulsion with no propeller cavitation (sub-marine design)
– Off-axis drag eliminated by direct straight in-line pull
– Trawl mouth and shape controlled by positive pull, not by counteracting 
trawl doors
– Trawl doors are removed
– Trawl position independent on vessel position
– Less fuel used to place the trawl

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Conventional trawling

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– Sub-optimal propulsion by cavitating propellers
– Sub-optimal operation, vessel designed for 12 knots, trawling at 4 knots
– Trawl is pulled off axis resulting in high drag forces
– Power used to propel vessel, lift the net, spread the trawl doors and to pull the trawl net
– Trawl position fully dependent on vessel position

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