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The upgrading of a Mermaid underwater vehicle
de Haan, D. (1993). The upgrading of a Mermaid underwater vehicle. ICES Mar. Sci. Symp. 196: 140-142
In: ICES Marine Science Symposia. ICES/Reitzel: Copenhagen. ISSN 0906-060X, more

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    Behavioural responses; Environmental surveys; Fishery sciences; Fishing gear; Gear research; Trawl nets; Underwater vehicles; Viewing underwater; Marine

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    Dutch research on development of direct observation techniques started with the purchase of an underwater towed vehicle of type "Mermaid Explorer" in 1985. Targets for further development were observation of a wider range of fishing gears, with speeds up to 7 knots, and inspections of the marine environment requiring low-speed operation. A feasibility analysis showed the potential of an increase in magnus rotor performance. The single towing mode will be extended by a propelling mode (hovering mode). The two modes are to be interswitched without paying back. Performance measurements on several rotor configurations were conducted as part of the vehicle design process. A cross lay-out with four rotors reached the greatest depth in the shortest amount of time. A spherical rotor appeared to be ineffective.

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